scala 基本语法-cp
2016-07-05 20:34
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[root@cdh2 network-scripts]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> object HelloWorld {
| def main(args: Array[String]) {
| println("Hello, world!")
| }
| }
defined module HelloWorld
scala> HelloWorld.main(null);
Hello, world!
scala>
[root@cdh2 network-scripts]# cd /user/local/
[root@cdh2 local]# ll
total 1134428
drwxr-xr-x 11 root root 4096 Jun 30 16:22 apache-storm-0.9.2-incubating
drwxr-xr-x 5 root root 4096 Apr 21 2012 examples-ch02-getting_started-master
drwxr-xr-x 5 1000 1000 4096 Jun 30 20:23 ez_setup-0.9
-rwxr-xr-x 1 root root 6577 Jun 30 17:59 ez_setup-0.9.tar.gz
-rw-r--r-- 1 root root 12402 Jun 2 06:15 ez_setup.py
drwxr-xr-x 10 root root 4096 Jun 16 16:19 hadoop-2.6.0
drwxr-xr-x 9 root root 4096 Jun 27 08:40 hbase-0.98.20-hadoop2
drwxr-xr-x 8 root root 4096 Jun 16 02:50 jdk
drwxr-xr-x 10 root root 4096 Jun 27 23:49 jzmq
drwxr-xr-x 6 root root 4096 Jun 29 03:24 kafka_2.9.2-0.8.1.1
drwxrwxr-x 16 1000 1000 4096 Jul 1 00:09 Python-3.4.3
-rw-r--r-- 1 root root 19554643 Feb 25 2015 Python-3.4.3.tgz
drwxr-xr-x 8 119 129 4096 Jun 17 08:35 scala-2.9.3
drwxr-xr-x 9 root root 4096 Jun 30 22:34 setuptools-23.1.0
-rw-r--r-- 1 root root 648277 Jun 30 22:02 setuptools-23.1.0.zip
drwxr-xr-x 13 hadoop hadoop 4096 Jun 17 09:03 spark-1.4.0-bin-hadoop2.6
drwxrwxrwx 4 1000 users 4096 Jun 30 23:49 sqlite-3.6.20
-rwxr-xr-x 1 root root 1407934 Jun 30 23:43 sqlite-amalgamation-3.6.20.tar.gz
drwxr-xr-x 4 root root 4096 Jun 28 18:07 src_bak
drwxr-xr-x 2 root root 4096 Jun 28 23:01 src_old
-rwxr-xr-x 1 root root 1203927040 Jun 28 18:03 src_old.tar
drwxrwxr-x 11 1000 1000 4096 Jun 27 23:44 zeromq-4.1.2
drwxr-xr-x 11 1000 1000 4096 Jun 29 23:31 zookeeper-3.4.6
drwxr-xr-x 11 root root 4096 Jun 29 23:30 zookeeper-3.4.6_1
drwxr-xr-x 11 root root 4096 Jun 29 23:30 zookeeper-3.4.6_2
drwxr-xr-x 11 root root 4096 Jun 29 22:14 zookeeper-3.4.6_3
-rw-r--r-- 1 root root 19117 Jul 1 00:03 zookeeper.out
[root@cdh2 local]# mkdir test
[root@cdh2 local]# cd test/
[root@cdh2 test]# ll
total 0
[root@cdh2 test]# pwd
/user/local/test
[root@cdh2 test]# touch script.sh
[root@cdh2 test]# vim script.sh
[root@cdh2 test]# ./script.sh
bash: ./script.sh: Permission denied
[root@cdh2 test]# ll
total 4
-rw-r--r-- 1 root root 176 Jul 4 03:54 script.sh
[root@cdh2 test]# chmod +x script.sh
[root@cdh2 test]# ll
total 4
-rwxr-xr-x 1 root root 176 Jul 4 03:54 script.sh
[root@cdh2 test]# ./script.sh
error: script file does not close its header with !# or ::!#
one error found
[root@cdh2 test]# cat script.sh
#!/bin/sh
exec scala "$0" "$@"
!#
object HelloWorld {
def main(args: Array[String]) {
println("Hello, world! " + args.toList)
}
}
HelloWorld.main(args)
[root@cdh2 test]# touch person.sh
[root@cdh2 test]# vim person.sh
[root@cdh2 test]# chmod +x person.sh
[root@cdh2 test]# ll
total 8
-rwxr-xr-x 1 root root 193 Jul 4 04:06 person.sh
-rwxr-xr-x 1 root root 176 Jul 4 03:54 script.sh
[root@cdh2 test]# pe
peekfd perl perl5.10.1 perlbug perldoc perlthanks perror pethtool
[root@cdh2 test]# ll
total 8
-rwxr-xr-x 1 root root 193 Jul 4 04:06 person.sh
-rwxr-xr-x 1 root root 176 Jul 4 03:54 script.sh
[root@cdh2 test]# ./person.sh
Person(Al)
[root@cdh2 test]# cat script.sh
#!/bin/sh
exec scala "$0" "$@"
!#
object HelloWorld {
def main(args: Array[String]) {
println("Hello, world! " + args.toList)
}
}
HelloWorld.main(args)
[root@cdh2 test]# cat person.sh
#!/bin/sh
exec scala "$0" "$@"
!#
case class Person(name: String)
object HelloWorld {
def main(args: Array[String]) {
val al = Person("Al")
println(al)
}
}
HelloWorld.main(args)
[root@cdh2 test]# vim script.sh
[root@cdh2 test]# ./script.sh
Hello, world! List()
[root@cdh2 test]# ./script.sh hahah
Hello, world! List(hahah)
[root@cdh2 test]# ./script.sh haha
Hello, world! List(haha)
[root@cdh2 test]# cat person.sh
#!/bin/sh
exec scala "$0" "$@"
!#
case class Person(name: String)
object HelloWorld {
def main(args: Array[String]) {
val al = Person("Al")
println(al)
}
}
HelloWorld.main(args)
[root@cdh2 test]#
============================
history
1105 ls -l
1106 vi __init__.py
1107 cd ..
1108 pwd
1109 python manage.py runserver 0.0.0.0:8000
1110 cat HelloWorld/urls.py
1111 vim HelloWorld/urls.py
1112 cat HelloWorld/urls.py
1113 python manage.py runserver 0.0.0.0:8000
1114 pwd
1115 vim HelloWorld/urls.py
1116 pwd
1117 tree
1118 cd HelloWorld/
1119 ls -l
1120 rm -rf __pycache__/
1121 ls -l
1122 python manage.py runserver 0.0.0.0:8000
1123 cd ..
1124 python manage.py runserver 0.0.0.0:8000
1125 vim HelloWorld/urls.py
1126 cd HelloWorld/
1127 rm -rf __pycache__/
1128 cd ..
1129 python manage.py runserver 0.0.0.0:8000
1130 cd HelloWorld/
1131 pwd
1132 cd HelloWorld/
1133 ll
1134 pwd
1135 ll- l
1136 cd ..
1137 ll
1138 ls -lre
1139 ls -ltr
1140 django-admin.py startproject HelloWorld
1141 ll
1142 python
1143 ifconfig
1144 service network restart
1145 ifconfig
1146 cat /etc/profile
1147 cat /etc/hosts
1148 service network restart
1149 cd /etc/sysconfig/
1150 ll
1151 cd network-scripts
1152 ll
1153 ls -ltr
1154 cat ifcfg-eth0
1155 ifconfig
1156 service network restart
1157 ifconfig
1158 service network restart
1159 ifconfig
1160 vim ifcfg-eth0
1161 cat /etc/hosts
1162 vim /etc/hosts
1163 cat /etc/hosts
1164 cat ifcfg-eth0
1165 service network restart
1166 ping 192.168.3.120
1167 ifconfig
1168 service network restart
1169 ifconfig
1170 scala
1171 ll
1172 pwd
1173 cd /user/local/
1174 ll
1175 mkdir test
1176 cd test/
1177 ll
1178 pwd
1179 touch script.sh
1180 vim script.sh
1181 ./script.sh
1182 ll
1183 chmod +x script.sh
1184 ll
1185 ./script.sh
1186 cat script.sh
1187 touch person.sh
1188 vim person.sh
1189 chmod +x person.sh
1190 ll
1191 ./person.sh
1192 cat script.sh
1193 cat person.sh
1194 vim script.sh
1195 ./script.sh
1196 ./script.sh hahah
1197 ./script.sh haha
1198 cat person.sh
1199 ll
1200 mkdir classes
1201 ll
1202 touch HelloWorld.scala
1203 vim HelloWorld.scala
1204 ls -l classes/
1205 scalac -d classes HelloWorld.scala
1206 ls -l classes/
1207 scala HelloWorld
1208 scala -classpath classes HelloWorld
1209 touch application.scala
1210 vim application.scala
1211 cat application.scala
1212 vim application.scala
1213 cat application.scala
1214 scalac -d classes application.scala
1215 ls -l classes/
1216 mv application.scala HelloWorld2.scala
1217 ls -l classes/
1218 ll
1219 ls -l classes/
1220 rm -rf *2*
1221 ll
1222 ls -l classes/
1223 rm -rf classes/*2*
1224 ll
1225 ls -l classes/
1226 touch application.scala
1227 vim application.scala
1228 cat application.scala
1229 mv application.scala HelloWorld2.scala
1230 ls -l classes/
1231 scalac -d classes HelloWorld2.scala
1232 LL
1233 ll
1234 ls -l classes/
1235 scala classes/HelloWorld2
1236 scala HelloWorld2
1237 ll
1238 scala -d classes HelloWorld2
1239 scala -d classes HelloWorld2.scala
1240 scala -classpath classes HelloWorld2.scala
1241 ls -l classes/
1242 rm -rf classes/*2*
1243 ls -l classes/
1244 scalac -d classes HelloWorld2.scala
1245 ls -l classes/
1246 vim HelloWorld2.scala
1247 rm -rf classes/*2*
1248 ls -l classes/
1249 scalac -d classes HelloWorld2.scala
1250 history
[root@cdh2 test]#
[root@cdh2 test]#
[root@cdh2 test]# ll
total 20
drwxr-xr-x 2 root root 4096 Jul 4 18:44 classes
-rw-r--r-- 1 root root 104 Jul 4 18:44 HelloWorld2.scala
-rw-r--r-- 1 root root 88 Jul 4 04:18 HelloWorld.scala
-rwxr-xr-x 1 root root 193 Jul 4 04:06 person.sh
-rwxr-xr-x 1 root root 166 Jul 4 04:13 script.sh
[root@cdh2 test]# vim Test.scala
[root@cdh2 test]# scalac -d classes HelloWorld2.scala
HelloWorld2.scala:1: error: expected class or object definition
#!/bin/sh
^
HelloWorld2.scala:2: error: expected class or object definition
exec scala "$0" "$@"
^
HelloWorld2.scala:3: error: expected class or object definition
!#
^
three errors found
[root@cdh2 test]# scalac -d classes Test.scala.scala
error: source file 'Test.scala.scala' could not be found
one error found
[root@cdh2 test]# ls -l classes/
total 8
-rw-r--r-- 1 root root 637 Jul 4 04:18 HelloWorld.class
-rw-r--r-- 1 root root 606 Jul 4 04:18 HelloWorld$.class
[root@cdh2 test]# scalac -d classes Test.scala
[root@cdh2 test]# scala Test.scala
[root@cdh2 test]# scala -classpath classes Test
Yiibai x location : 20
Yiibai y location : 30
[root@cdh2 test]# vim Test.scala
[root@cdh2 test]# ls -l classes/
total 20
-rw-r--r-- 1 root root 637 Jul 4 04:18 HelloWorld.class
-rw-r--r-- 1 root root 606 Jul 4 04:18 HelloWorld$.class
-rw-r--r-- 1 root root 599 Jul 4 18:58 Test.class
-rw-r--r-- 1 root root 567 Jul 4 18:58 Test$.class
-rw-r--r-- 1 root root 1897 Jul 4 18:58 Yiibai.class
[root@cdh2 test]# scala -d classes Test.scala
[root@cdh2 test]# scalac -classpath classes Test
error: source file 'Test' could not be found
one error found
[root@cdh2 test]# ls -l classes/
total 20
-rw-r--r-- 1 root root 637 Jul 4 04:18 HelloWorld.class
-rw-r--r-- 1 root root 606 Jul 4 04:18 HelloWorld$.class
-rw-r--r-- 1 root root 599 Jul 4 18:58 Test.class
-rw-r--r-- 1 root root 567 Jul 4 18:58 Test$.class
-rw-r--r-- 1 root root 1897 Jul 4 18:58 Yiibai.class
[root@cdh2 test]# scalac -d classes Test.scala
[root@cdh2 test]# scala -classpath classes Test
Yiibai x-0 location : 10
Yiibai y-0 location : 20
Yiibai x location : 20
Yiibai y location : 30
[root@cdh2 test]# vim Test2.scala
[root@cdh2 test]# scalac -d classes Test2.scala
[root@cdh2 test]# scala -classpath classes Test2
Yiibai x location : 20
Yiibai y location : 30
Yiibai z location : 20
[root@cdh2 test]# cat Test2.scala
import java.io._
class Yiibai(val xc: Int, val yc: Int) {
var x: Int = xc
var y: Int = yc
def move(dx: Int, dy: Int) {
x = x + dx
y = y + dy
println ("Yiibai x location : " + x);
println ("Yiibai y location : " + y);
}
}
class Location(override val xc: Int, override val yc: Int,
val zc :Int) extends Yiibai(xc, yc){
var z: Int = zc
def move(dx: Int, dy: Int, dz: Int) {
x = x + dx
y = y + dy
z = z + dz
println ("Yiibai x location : " + x);
println ("Yiibai y location : " + y);
println ("Yiibai z location : " + z);
}
}
object Test2 {
def main(args: Array[String]) {
val loc = new Location(10, 20, 15);
// Move to a new location
loc.move(10, 10, 5);
}
}
[root@cdh2 test]# scala -classpath classes Test2
Yiibai x location : 20
Yiibai y location : 30
Yiibai z location : 20
[root@cdh2 test]# scala -classpath classes Test
Yiibai x location : 20
Yiibai y location : 30
[root@cdh2 test]# vim Test3.scala
[root@cdh2 test]# cat Test3.scala
import java.io._
class Yiibai(val xc: Int, val yc: Int) {
var x: Int = xc
var y: Int = yc
def move(dx: Int, dy: Int) {
x = x + dx
y = y + dy
}
}
object Test3 {
def main(args: Array[String]) {
val yiibai = new Yiibai(10, 20)
printYiibai
def printYiibai{
println ("Yiibai x location : " + yiibai.x);
println ("Yiibai y location : " + yiibai.y);
}
}
}
[root@cdh2 test]# scalac -d classes Test3
error: source file 'Test3' could not be found
one error found
[root@cdh2 test]# scalac -d classes Test3.scala
[root@cdh2 test]# scala -classpath classes Test3
Yiibai x location : 10
Yiibai y location : 20
[root@cdh2 test]# vim Test3.scala
[root@cdh2 test]# cat Test3.scala
import java.io._
class Yiibai(val xc: Int, val yc: Int) {
var x: Int = xc
var y: Int = yc
def move(dx: Int, dy: Int) {
x = x + dx
y = y + dy
}
}
object Test3 {
def main(args: Array[String]) {
val yiibai = new Yiibai(10, 20)
printYiibai
def printYiibai{
println ("Yiibai--x location : " + yiibai.x);
println ("Yiibai--y location : " + yiibai.y);
}
}
}
[root@cdh2 test]# scalac -d classes Test3.scala
SC[root@cdh2 test]# scala -classpath classes Test3
Yiibai--x location : 10
Yiibai--y location : 20
[root@cdh2 test]# vim TraitTest.scala
[root@cdh2 test]# scalac -d classes TraitTest.scala
[root@cdh2 test]# scala -classpath classes TraitTest
false
true
true
[root@cdh2 test]# cat TraitTest.scala
trait Equal {
def isEqual(x: Any): Boolean
def isNotEqual(x: Any): Boolean = !isEqual(x)
}
class Yiibai(xc: Int, yc: Int) extends Equal {
var x: Int = xc
var y: Int = yc
def isEqual(obj: Any) =
obj.isInstanceOf[Yiibai] &&
obj.asInstanceOf[Yiibai].x == x
}
object TraitTest {
def main(args: Array[String]) {
val p1 = new Yiibai(2, 3)
val p2 = new Yiibai(2, 4)
val p3 = new Yiibai(3, 3)
println(p1.isNotEqual(p2))
println(p1.isNotEqual(p3))
println(p1.isNotEqual(2))
}
}
[root@cdh2 test]# vim TraitTest.scala
[root@cdh2 test]# scalac -d classes TraitTest.scala
TraitTest.scala:30: error: ')' expected but '(' found.
println(p1.isEqual(new(Yiibai(2,5))))
^
TraitTest.scala:30: error: ';' expected but ')' found.
println(p1.isEqual(new(Yiibai(2,5))))
^
two errors found
[root@cdh2 test]# vim TraitTest.scala
[root@cdh2 test]# scalac -d classes TraitTest.scala
[root@cdh2 test]# scala -classpath classes TraitTest
false
true
true
true
false
false
true
false
true
true
[root@cdh2 test]# cat TraitTest.scala
trait Equal {
def isEqual(x: Any): Boolean
def isNotEqual(x: Any): Boolean = !isEqual(x)
}
class Yiibai(xc: Int, yc: Int) extends Equal {
var x: Int = xc
var y: Int = yc
def isEqual(obj: Any) =
obj.isInstanceOf[Yiibai] &&
obj.asInstanceOf[Yiibai].x == x
}
object TraitTest {
def main(args: Array[String]) {
val p1 = new Yiibai(2, 3)
val p2 = new Yiibai(2, 4)
val p3 = new Yiibai(3, 3)
println(p1.isNotEqual(p2))
println(p1.isNotEqual(p3))
println(p1.isNotEqual(2))
println()
println(p1.isEqual(p2))
println(p1.isEqual(p3))
println(p1.isEqual(2))
println()
println(p1.isEqual(p2))
println(p1.isEqual(p3))
println(p1.isEqual(new Yiibai(2,5)))
println()
println(p3.isEqual(new Yiibai(3,5)))
}
}
[root@cdh2 test]# pwd
/user/local/test
[root@cdh2 test]# scala -classpath classes TraitTest
false
true
true
true
false
false
true
false
true
true
[root@cdh2 test]# vim CaseTest.scala
[root@cdh2 test]# scalac -d classes CaseTest.scala
[root@cdh2 test]# scala -classpath classes CaseTest
many
two
one
[root@cdh2 test]# cat CaseTest.scala
object CaseTest {
def main(args: Array[String]) {
println(matchTest(3))
println(matchTest(2))
println(matchTest(1))
}
def matchTest(x: Int): String = x match {
case 1 => "one"
case 2 => "two"
case _ => "many"
}
}
[root@cdh2 test]# vim CaseTest2.scala
[root@cdh2 test]# scalac -d classes CaseTest2.scala
[root@cdh2 test]# scala -classpath classes CaseTest2
Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target: CaseTest2
at scala.sys.package$.error(package.scala:27)
at scala.tools.nsc.GenericRunnerCommand.scala$tools$nsc$GenericRunnerCommand$$guessHowToRun(GenericRunnerCommand.scala:38)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.Option.getOrElse(Option.scala:108)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:17)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:33)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# vim CaseTest2.scala
[root@cdh2 test]# scalac -d classes CaseTest2.scala
[root@cdh2 test]# scala -classpath classes CaseTest2
2
many
one
[root@cdh2 test]# cat CaseTest2.scala
object CaseTest2 {
def main(args: Array[String]) {
println(matchTest("two"))
println(matchTest("test"))
println(matchTest(1))
}
def matchTest(x: Any): Any = x match {
case 1 => "one"
case "two" => 2
case y: Int => "scala.Int"
case _ => "many"
}
}
[root@cdh2 test]# vim CaseTest2.scala
[root@cdh2 test]# scalac -d classes CaseTest2.scala
^[[A[root@cdh2 tesll
total 44
-rw-r--r-- 1 root root 330 Jul 4 19:45 CaseTest2.scala
-rw-r--r-- 1 root root 263 Jul 4 19:38 CaseTest.scala
drwxr-xr-x 2 root root 4096 Jul 4 19:43 classes
-rw-r--r-- 1 root root 104 Jul 4 18:44 HelloWorld2.scala
-rw-r--r-- 1 root root 88 Jul 4 04:18 HelloWorld.scala
-rwxr-xr-x 1 root root 193 Jul 4 04:06 person.sh
-rwxr-xr-x 1 root root 166 Jul 4 04:13 script.sh
-rw-r--r-- 1 root root 769 Jul 4 19:07 Test2.scala
-rw-r--r-- 1 root root 426 Jul 4 19:13 Test3.scala
-rw-r--r-- 1 root root 493 Jul 4 19:00 Test.scala
-rw-r--r-- 1 root root 815 Jul 4 19:31 TraitTest.scala
[root@cdh2 test]# scala -classpath classes CaseTest2
2
many
one
scala.Int
[root@cdh2 test]# cat CaseTest2.scala
object CaseTest2 {
def main(args: Array[String]) {
println(matchTest("two"))
println(matchTest("test"))
println(matchTest(1))
println(matchTest(4))
}
def matchTest(x: Any): Any = x match {
case 1 => "one"
case "two" => 2
case y: Int => "scala.Int"
case _ => "many"
}
}
[root@cdh2 test]#
[root@cdh2 test]# jps
2675 QuorumPeerMain
32348 MainGenericRunner
32504 Jps
[root@cdh2 test]# zkServer.sh status
JMX enabled by default
Using config: /user/local/zookeeper-3.4.6/bin/../conf/zoo.cfg
Mode: standalone
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> val x = List(1,2,3,4)
x: List[Int] = List(1, 2, 3, 4)
scala> x
res0: List[Int] = List(1, 2, 3, 4)
scala> val x = List(1,2,3,4,1,2,3)
x: List[Int] = List(1, 2, 3, 4, 1, 2, 3)
scala> x
res1: List[Int] = List(1, 2, 3, 4, 1, 2, 3)
scala> var x = Set(1,3,5,7,1,3,5,7)
x: scala.collection.immutable.Set[Int] = Set(1, 3, 5, 7)
scala> x
res2: scala.collection.immutable.Set[Int] = Set(1, 3, 5, 7)
scala> var x = Set(1,3,5,7)
x: scala.collection.immutable.Set[Int] = Set(1, 3, 5, 7)
scala> x
res3: scala.collection.immutable.Set[Int] = Set(1, 3, 5, 7)
scala> val x = Map("one" -> 1, "two" -> 2, "three" -> 3)
x: scala.collection.immutable.Map[java.lang.String,Int] = Map(one -> 1, two -> 2, three -> 3)
scala> x
res4: scala.collection.immutable.Map[java.lang.String,Int] = Map(one -> 1, two -> 2, three -> 3)
scala> val x = (10, "Scala")
x: (Int, java.lang.String) = (10,Scala)
scala> x
res5: (Int, java.lang.String) = (10,Scala)
scala> val x:Option[Int] = Some(5)
x: Option[Int] = Some(5)
scala> x
res6: Option[Int] = Some(5)
scala>
[root@cdh2 test]# ll
total 44
-rw-r--r-- 1 root root 330 Jul 4 19:45 CaseTest2.scala
-rw-r--r-- 1 root root 263 Jul 4 19:38 CaseTest.scala
drwxr-xr-x 2 root root 4096 Jul 4 19:43 classes
-rw-r--r-- 1 root root 104 Jul 4 18:44 HelloWorld2.scala
-rw-r--r-- 1 root root 88 Jul 4 04:18 HelloWorld.scala
-rwxr-xr-x 1 root root 193 Jul 4 04:06 person.sh
-rwxr-xr-x 1 root root 166 Jul 4 04:13 script.sh
-rw-r--r-- 1 root root 769 Jul 4 19:07 Test2.scala
-rw-r--r-- 1 root root 426 Jul 4 19:13 Test3.scala
-rw-r--r-- 1 root root 493 Jul 4 19:00 Test.scala
-rw-r--r-- 1 root root 815 Jul 4 19:31 TraitTest.scala
[root@cdh2 test]# vim CaseTest3.scala
[root@cdh2 test]# scalac -d classes CaseTest3.scala
[root@cdh2 test]# scala -classpath classes CaseTest3
()
()
()
()
[root@cdh2 test]# ls -l classes/
total 80
-rw-r--r-- 1 root root 779 Jul 4 19:45 CaseTest2.class
-rw-r--r-- 1 root root 1138 Jul 4 19:45 CaseTest2$.class
-rw-r--r-- 1 root root 762 Jul 4 19:56 CaseTest3.class
-rw-r--r-- 1 root root 1184 Jul 4 19:56 CaseTest3$.class
-rw-r--r-- 1 root root 773 Jul 4 19:42 CaseTest.class
-rw-r--r-- 1 root root 1118 Jul 4 19:42 CaseTest$.class
-rw-r--r-- 1 root root 559 Jul 4 19:31 Equal.class
-rw-r--r-- 1 root root 465 Jul 4 19:31 Equal$class.class
-rw-r--r-- 1 root root 637 Jul 4 04:18 HelloWorld.class
-rw-r--r-- 1 root root 606 Jul 4 04:18 HelloWorld$.class
-rw-r--r-- 1 root root 1967 Jul 4 19:07 Location.class
-rw-r--r-- 1 root root 605 Jul 4 19:07 Test2.class
-rw-r--r-- 1 root root 579 Jul 4 19:07 Test2$.class
-rw-r--r-- 1 root root 605 Jul 4 19:14 Test3.class
-rw-r--r-- 1 root root 1137 Jul 4 19:14 Test3$.class
-rw-r--r-- 1 root root 599 Jul 4 19:04 Test.class
-rw-r--r-- 1 root root 567 Jul 4 19:04 Test$.class
-rw-r--r-- 1 root root 630 Jul 4 19:31 TraitTest.class
-rw-r--r-- 1 root root 1163 Jul 4 19:31 TraitTest$.class
-rw-r--r-- 1 root root 1480 Jul 4 19:31 Yiibai.class
[root@cdh2 test]# scalac -d classes CaseTest3.scala
[root@cdh2 test]# scala -classpath classes CaseTest3
()
()
()
()
[root@cdh2 test]# vim CaseTest3.scala
[root@cdh2 test]# scalac -d classes CaseTest3.scala
CaseTest3.scala:9: error: illegal start of declaration (possible cause: missing `=' in front of current method body)
x match {
^
one error found
[root@cdh2 test]# vim CaseTest3.scala
[root@cdh2 test]# scalac -d classes CaseTest3.scala
[root@cdh2 test]# scala -classpath classes CaseTest3
2
many
one
scala.Int
[root@cdh2 test]# cat CaseTest3.scala
object CaseTest3 {
def main(args: Array[String]) {
println(matchTest("two"))
println(matchTest("test"))
println(matchTest(1))
println(matchTest(5))
}
def matchTest(x: Any):Any={
x match {
case 1 => "one"
case "two" => 2
case y: Int => "scala.Int"
case _ => "many"
}
}
}
[root@cdh2 test]# ok
bash: ok: command not found
[root@cdh2 test]# vim ForTest.scala
[root@cdh2 test]# scalac -d classes/ ForTest.scala
[root@cdh2 test]# scala -classpath classes/ ForTest
Hi Alice! 25
Age: 32 year, name: Bob?
Age: 32 year, name: Charlie?
[root@cdh2 test]# CAT ForTest.scala
bash: CAT: command not found
[root@cdh2 test]# cat ForTest.scala
object ForTest {
def main(args: Array[String]) {
val alice = new Person("Alice", 25)
val bob = new Person("Bob", 32)
val charlie = new Person("Charlie", 32)
for (person <- List(alice, bob, charlie)) {
person match {
case Person("Alice", 25) => println("Hi Alice! 25")
case Person("Bob", 30) => println("Hi Bob! 30")
case Person(name, age) =>
println("Age: " + age + " year, name: " + name + "?")
}
}
}
// case class, empty one.
case class Person(name: String, age: Int)
}
[root@cdh2 test]# vim ForTest.scala
[root@cdh2 test]# scalac -d classes/ ForTest.scala
[root@cdh2 test]# scala -classpath classes/ ForTest
Hi Alice! 25
Hi Bob! 30
Age: 32 year, name: Charlie?
[root@cdh2 test]# cat ForTest.scala
object ForTest {
def main(args: Array[String]) {
val alice = new Person("Alice", 25)
val bob = new Person("Bob", 30)
val charlie = new Person("Charlie", 32)
for (person <- List(alice, bob, charlie)) {
person match {
case Person("Alice", 25) => println("Hi Alice! 25")
case Person("Bob", 30) => println("Hi Bob! 30")
case Person(name, age) =>
println("Age: " + age + " year, name: " + name + "?")
}
}
}
// case class, empty one.
case class Person(name: String, age: Int)
}
[root@cdh2 test]# ok 30
bash: ok: command not found
[root@cdh2 test]# scala -classpath classes/ ForTest
Hi Alice! 25
Hi Bob! 30
Age: 32 year, name: Charlie?
[root@cdh2 test]# cat ForTest.scala
object ForTest {
def main(args: Array[String]) {
val alice = new Person("Alice", 25)
val bob = new Person("Bob", 30)
val charlie = new Person("Charlie", 32)
for (person <- List(alice, bob, charlie)) {
person match {
case Person("Alice", 25) => println("Hi Alice! 25")
case Person("Bob", 30) => println("Hi Bob! 30")
case Person(name, age) =>
println("Age: " + age + " year, name: " + name + "?")
}
}
}
// case class, empty one.
case class Person(name: String, age: Int)
}
[root@cdh2 test]#
[root@cdh2 test]#
[root@cdh2 test]# scalac -d classes/ RegexTest1.scala
[root@cdh2 test]# scala -classpath classes/ RegexTest1
Some(Scala)
[root@cdh2 test]# vim RegexTest2.scala
[root@cdh2 test]# scalac -d classes/ RegexTest2.scala
[root@cdh2 test]# scala -classpath classes/ RegexTest2
Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target: RegexTest2
at scala.sys.package$.error(package.scala:27)
at scala.tools.nsc.GenericRunnerCommand.scala$tools$nsc$GenericRunnerCommand$$guessHowToRun(GenericRunnerCommand.scala:38)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.Option.getOrElse(Option.scala:108)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:17)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:33)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# vim RegexTest2.scala
[9]+ Stopped vim RegexTest2.scala
[root@cdh2 test]# vim RegexTest2.scala
[root@cdh2 test]# scalac -d classes/ RegexTest2.scala
[root@cdh2 test]# scala -classpath classes/ RegexTest2
Scala,scala
[root@cdh2 test]# cat RegexTest2.scala
import scala.util.matching.Regex
object RegexTest2{
def main(args: Array[String]) {
val pattern = new Regex("(S|s)cala")
val str = "Scala is scalable and cool"
println((pattern findAllIn str).mkString(","))
}
}
[root@cdh2 test]# scala -classpath classes/ RegexTest
Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target: RegexTest
at scala.sys.package$.error(package.scala:27)
at scala.tools.nsc.GenericRunnerCommand.scala$tools$nsc$GenericRunnerCommand$$guessHowToRun(GenericRunnerCommand.scala:38)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.Option.getOrElse(Option.scala:108)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:17)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:33)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# scalac -d classes/ RegexTest1.scala
[root@cdh2 test]# scala -classpath classes/ RegexTest1
Some(Scala)
[root@cdh2 test]# cat RegexTest1.scala
import scala.util.matching.Regex
object RegexTest1 {
def main(args: Array[String]) {
val pattern = "Scala".r
val str = "Scala is Scalable and cool"
println(pattern findFirstIn str)
}
}
[root@cdh2 test]#
import scala.util.matching.Regex
object RegexTest1 {
def main(args: Array[String]) {
val pattern = "Scala".r
val str = "Scala is Scalable and cool"
println(pattern findFirstIn str)
}
}
[root@cdh2 test]# scala -classpath classes/ RegexTest1
Some(Scala)
[root@cdh2 test]# vim RegexTest1.scala
[root@cdh2 test]# scalac -d classes/ RegexTest1.scala
[root@cdh2 test]# scala -classpath classes/ RegexTest1
Some(Scala)
non-empty iterator
[root@cdh2 test]# scala -classpath classes/ RegexTest2
Scala,scala
[root@cdh2 test]# scalac -d classes/ RegexTest2.scala
[root@cdh2 test]# scala -classpath classes/ RegexTest2
Scala,scala
[root@cdh2 test]# cat RegexTest2.scala
import scala.util.matching.Regex
object RegexTest2{
def main(args: Array[String]) {
val pattern = new Regex("(S|s)cala")
val str = "Scala is scalable and cool"
println((pattern findAllIn str).mkString(","))
}
}
[root@cdh2 test]# vim RegexTest1.scala
[root@cdh2 test]# scalac -d classes/ RegexTest1.scala
[root@cdh2 test]# scala -classpath classes/ RegexTest1
Some(Scala)
Scala,Scala
[root@cdh2 test]# scala -classpath classes/ RegexTest2
Scala,scala
[root@cdh2 test]# cat RegexTest1.scala
import scala.util.matching.Regex
object RegexTest1 {
def main(args: Array[String]) {
val pattern = "Scala".r
val str = "Scala is Scalable and cool"
println(pattern findFirstIn str)
println((pattern findAllIn str).mkString(","))
}
}
[root@cdh2 test]# cat RegexTest2.scala
import scala.util.matching.Regex
object RegexTest2{
def main(args: Array[String]) {
val pattern = new Regex("(S|s)cala")
val str = "Scala is scalable and cool"
println((pattern findAllIn str).mkString(","))
}
}
[root@cdh2 test]# vim RegexReplace.scala
[root@cdh2 test]# vim RegexReplace.scala
[root@cdh2 test]# scalac -d classes/ RegexReplace.scala
[root@cdh2 test]# scala -classpath classes/ RegexReplace
old str Scala is scalable and cool
Java is scalable and cool
[root@cdh2 test]# cat RegexReplace.scala
object RegexReplace {
def main(args: Array[String]) {
val pattern = "(S|s)cala".r
val str = "Scala is scalable and cool"
println("old str "+str)
println(pattern replaceFirstIn(str, "Java"))
}
}
[root@cdh2 test]# vim RegexD.scala
[root@cdh2 test]# scalac -d classes/ RegexD.scala
[root@cdh2 test]#
[root@cdh2 test]# scala -classpath classes/ RegexD
[root@cdh2 test]# scalac -d classes/ RegexD.scala
[root@cdh2 test]# scala -classpath classes RegexD
[root@cdh2 test]# cat RegexD.scala
import scala.util.matching.Regex
object RegexD{
def main(args: Array[String]) {
val pattern = new Regex("abl[ae]d+")
val str = "ablaw is able1 and cool"
val str1 = "ablaw is able1 and cool abla1 abla0 ablaw "
println((pattern findAllIn str).mkString(","))
println((pattern findAllIn str1).mkString(","))
}
}
[root@cdh2 test]# vim RegexD.scala
[root@cdh2 test]# vim RegexD.scala
[root@cdh2 test]# scalac -d classes/ RegexD.scala
[root@cdh2 test]# scala -classpath classes RegexD
[root@cdh2 test]# scalac -d classes/ RegexReplace.scala
[root@cdh2 test]# scala -classpath classes/ RegexReplace
old str Scala is scalable and cool
Java is scalable and cool
[root@cdh2 test]# scalac -d classes/ RegexD.scala
[root@cdh2 test]# scala -classpath classes/ RegexD
[root@cdh2 test]# vim RegexD.scala
[root@cdh2 test]# scalac -d classes/ RegexD.scala
[root@cdh2 test]# scala -classpath classes/ RegexD
[root@cdh2 test]# vim RegexD1.scala
[root@cdh2 test]# scalac -d classes/ RegexD1.scala
[root@cdh2 test]# scala -classpath classes/ RegexD1
[root@cdh2 test]# vim RegexD1.scala
[root@cdh2 test]# scalac -d classes/ RegexD1.scala
[root@cdh2 test]# scala -classpath classes/ RegexD1
abla,able
[root@cdh2 test]# cat RegexD1.scala
import scala.util.matching.Regex
object RegexD1 {
def main(args: Array[String]) {
val pattern = new Regex("abl[ae]")
val str = "abla is able and cool"
println((pattern findAllIn str).mkString(","))
}
}
[root@cdh2 test]# cp RegexD1.scala RegexD2.scala
[root@cdh2 test]# vim RegexD2.scala
[root@cdh2 test]# scalac -d classes/ RegexD2.scala
[root@cdh2 test]# scala -classpath classes/ RegexD2
[root@cdh2 test]# vim RegexD2.scala
[root@cdh2 test]# scalac -d classes/ RegexD2.scala
[root@cdh2 test]# scala -classpath classes/ RegexD2
[root@cdh2 test]# 正则表达式 没完全搞定
[root@cdh2 test]# ll
total 76
-rw-r--r-- 1 root root 330 Jul 4 19:45 CaseTest2.scala
-rw-r--r-- 1 root root 354 Jul 4 20:07 CaseTest3.scala
-rw-r--r-- 1 root root 263 Jul 4 19:38 CaseTest.scala
drwxr-xr-x 2 root root 4096 Jul 4 22:15 classes
-rw-r--r-- 1 root root 585 Jul 4 20:15 ForTest.scala
-rw-r--r-- 1 root root 104 Jul 4 18:44 HelloWorld2.scala
-rw-r--r-- 1 root root 88 Jul 4 04:18 HelloWorld.scala
-rwxr-xr-x 1 root root 193 Jul 4 04:06 person.sh
-rw-r--r-- 1 root root 234 Jul 4 22:12 RegexD1.scala
-rw-r--r-- 1 root root 250 Jul 4 22:18 RegexD2.scala
-rw-r--r-- 1 root root 349 Jul 4 22:07 RegexD.scala
-rw-r--r-- 1 root root 231 Jul 4 21:54 RegexReplace.scala
-rw-r--r-- 1 root root 270 Jul 4 21:48 RegexTest1.scala
-rw-r--r-- 1 root root 243 Jul 4 20:49 RegexTest2.scala
-rwxr-xr-x 1 root root 166 Jul 4 04:13 script.sh
-rw-r--r-- 1 root root 769 Jul 4 19:07 Test2.scala
-rw-r--r-- 1 root root 426 Jul 4 19:13 Test3.scala
-rw-r--r-- 1 root root 493 Jul 4 19:00 Test.scala
-rw-r--r-- 1 root root 815 Jul 4 19:31 TraitTest.scala
[root@cdh2 test]# vim File.scala
[root@cdh2 test]# scalac -d classes/ F
File.scala ForTest.scala
[root@cdh2 test]# scalac -d classes/ F
File.scala ForTest.scala
[root@cdh2 test]# scalac -d classes/ File.scala
[root@cdh2 test]# scala -classpath classes/ File
Missing file exception
[root@cdh2 test]# cat File.scala
import java.io.FileReader
import java.io.FileNotFoundException
import java.io.IOException
object File {
def main(args: Array[String]) {
try {
val f = new FileReader("input.txt")
} catch {
case ex: FileNotFoundException =>{
println("Missing file exception")
}
case ex: IOException => {
println("IO Exception")
}
}
}
}
[root@cdh2 test]# vim File1.scala
[10]+ Stopped vim File1.scala
[root@cdh2 test]# cp File.scala File1.scala
[root@cdh2 test]# ll
total 84
-rw-r--r-- 1 root root 330 Jul 4 19:45 CaseTest2.scala
-rw-r--r-- 1 root root 354 Jul 4 20:07 CaseTest3.scala
-rw-r--r-- 1 root root 263 Jul 4 19:38 CaseTest.scala
drwxr-xr-x 2 root root 4096 Jul 4 23:33 classes
-rw-r--r-- 1 root root 411 Jul 4 23:35 File1.scala
-rw-r--r-- 1 root root 411 Jul 4 23:32 File.scala
-rw-r--r-- 1 root root 585 Jul 4 20:15 ForTest.scala
-rw-r--r-- 1 root root 104 Jul 4 18:44 HelloWorld2.scala
-rw-r--r-- 1 root root 88 Jul 4 04:18 HelloWorld.scala
-rwxr-xr-x 1 root root 193 Jul 4 04:06 person.sh
-rw-r--r-- 1 root root 234 Jul 4 22:12 RegexD1.scala
-rw-r--r-- 1 root root 250 Jul 4 22:18 RegexD2.scala
-rw-r--r-- 1 root root 349 Jul 4 22:07 RegexD.scala
-rw-r--r-- 1 root root 231 Jul 4 21:54 RegexReplace.scala
-rw-r--r-- 1 root root 270 Jul 4 21:48 RegexTest1.scala
-rw-r--r-- 1 root root 243 Jul 4 20:49 RegexTest2.scala
-rwxr-xr-x 1 root root 166 Jul 4 04:13 script.sh
-rw-r--r-- 1 root root 769 Jul 4 19:07 Test2.scala
-rw-r--r-- 1 root root 426 Jul 4 19:13 Test3.scala
-rw-r--r-- 1 root root 493 Jul 4 19:00 Test.scala
-rw-r--r-- 1 root root 815 Jul 4 19:31 TraitTest.scala
[root@cdh2 test]# vim File1.scala
[root@cdh2 test]# scalac -d classes/ File1.scala
[root@cdh2 test]# scala -classpath classes/ File1
Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target: File1
at scala.sys.package$.error(package.scala:27)
at scala.tools.nsc.GenericRunnerCommand.scala$tools$nsc$GenericRunnerCommand$$guessHowToRun(GenericRunnerCommand.scala:38)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.Option.getOrElse(Option.scala:108)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:17)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:33)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# vim File1.scala
[root@cdh2 test]# scalac -d classes/ File1.scala
[root@cdh2 test]# scala -classpath classes/ File1
Missing file exception
Exiting finally...
[root@cdh2 test]# cat File1.scala
import java.io.FileReader
import java.io.FileNotFoundException
import java.io.IOException
object File1 {
def main(args: Array[String]) {
try {
val f = new FileReader("input.txt")
} catch {
case ex: FileNotFoundException =>{
println("Missing file exception")
}
case ex: IOException => {
println("IO Exception")
}
}
finally {
println("Exiting finally...")
}
}
}
[root@cdh2 test]# cp File1.scala File2.scala
[root@cdh2 test]# vim File2.scala
[root@cdh2 test]# scalac -d classes/ File2.scala
[root@cdh2 test]# scala -classpath classes/ File2
Missing file exception
---Missing file exception--java.io.FileNotFoundException: input.txt (No such file or directory)
Exiting finally...
[root@cdh2 test]# cat File2.scala
import java.io.FileReader
import java.io.FileNotFoundException
import java.io.IOException
object File2 {
def main(args: Array[String]) {
try {
val f = new FileReader("input.txt")
} catch {
case ex: FileNotFoundException =>{
println("Missing file exception")
println("---Missing file exception--"+ex)
}
case ex: IOException => {
println("IO Exception")
}
[root@cdh2 test]# scalac -d classes/ Some.scala
Some.scala:18: error: type mismatch;
found : java.lang.String
required: Option[(String, String)]
Some(parts(0), parts(1))
^
one error found
[root@cdh2 test]# less Some.scala
[root@cdh2 test]# cat Some.scala
object Some {
def main(args: Array[String]) {
println ("Apply method : " + apply("Zara", "gmail.com"));
println ("Unapply method : " + unapply("Zara@gmail.com"));
println ("Unapply method : " + unapply("Zara Ali"));
}
// The injection method (optional)
def apply(user: String, domain: String) = {
user +"@"+ domain
}
// The extraction method (mandatory)
def unapply(str: String): Option[(String, String)] = {
val parts = str split "@"
if (parts.length == 2){
Some(parts(0), parts(1))
}else{
None
}
}
}
[root@cdh2 test]# cp Some.scala
cp: missing destination file operand after `Some.scala'
Try `cp --help' for more information.
[root@cdh2 test]# cp Some.scala Some1.scala
[root@cdh2 test]# vim Some.scala
[root@cdh2 test]# scalac -d classes/ Some.scala
[root@cdh2 test]# scala -classpath classes/ Some
Apply method : Zara@gmail.com
Unapply method : Some((Zara,gmail.com))
Unapply method : None
[root@cdh2 test]# scalac -d classes/ Some.scala
[root@cdh2 test]# scala -classpath classes/ Some
Apply method : Zara@gmail.com
Unapply method : Some((Zara,gmail.com))
Unapply method : None
[root@cdh2 test]# cat Some.scala
object Some {
def main(args: Array[String]) {
println ("Apply method : " + apply("Zara", "gmail.com"));
println ("Unapply method : " + unapply("Zara@gmail.com"));
println ("Unapply method : " + unapply("Zara Ali"));
}
// The injection method (optional)
def apply(user: String, domain: String) = {
user +"@"+ domain
}
// The extraction method (mandatory)
def unapply(str: String): Option[(String, String)] = {
val parts = str split "@"
if (parts.length == 2){
//Some(parts(0), parts(1))
Option(parts(0), parts(1))
}else{
None
}
}
}
[root@cdh2 test]#
[root@cdh2 test]# scala -classpath classes/ Some
Apply method : Zara@gmail.com
Unapply method : Some((Zara,gmail.com))
Unapply method : None
[root@cdh2 test]# vim TestExtractor.scala
[root@cdh2 test]# scalac -d classes/ TestExtractor.scala
[root@cdh2 test]# scala -classpath classes/ TestExtractor
10
10 is bigger two times than 5
[root@cdh2 test]# cat TestExtractor.scala
object TestExtractor {
def main(args: Array[String]) {
val x = TestExtractor(5)
println(x)
x match
{
case TestExtractor(num) => println(x+" is bigger two times than "+num)
//unapply is invoked
case _ => println("i cannot calculate")
}
}
def apply(x: Int) = x*2
def unapply(z: Int): Option[Int] = if (z%2==0) Some(z/2) else None
}
[root@cdh2 test]# 这个怎么运行的没搞定诶
Hello Scala[root@cdh2 test]#
[root@cdh2 test]# cat test.txt
Hello Scala[root@cdh2 test]#
[root@cdh2 test]# cat FileWR.scala
import java.io._
object FileWR{
def main(args: Array[String]) {
val writer = new PrintWriter(new File("test.txt" ))
writer.write("Hello Scala")
writer.close()
}
}
[root@cdh2 test]#
[root@cdh2 test]#
[root@cdh2 test]# vim Console.scala
[root@cdh2 test]# scalac -d classes/ Console.scala
Console.scala:4: error: value readLine is not a member of object Console
val line = Console.readLine
^
one error found
[root@cdh2 test]# vim Console.scala
[root@cdh2 test]# scalac -d classes/ Console.scala
Console.scala:4: error: value readLine is not a member of object Console
val line = Console.readLine()
^
one error found
[root@cdh2 test]# vim Console.scala
[11]+ Stopped vim Console.scala
[root@cdh2 test]# vim Source.scala
[root@cdh2 test]# scalac -d classes/ Source.scala
Source.scala:1: warning: imported `Source' is permanently hidden by definition of object Source
import scala.io.Source
^
Source.scala:7: error: value fromFile is not a member of object Source
Source.fromFile("test.txt" ).foreach{
^
one warning found
one error found
[root@cdh2 test]# scala -version
Scala code runner version 2.9.3 -- Copyright 2002-2011, LAMP/EPFL
[root@cdh2 test]# scalac -d classes/ Console.scala
Console.scala:4: error: value readLine is not a member of object Console
val line = Console.readLine()
^
one error found
[root@cdh2 test]# vim Console.scala
[root@cdh2 test]# mv Console.scala ConsoleTest.scala
[root@cdh2 test]# scalac -d classes/ ConsoleTest.scala
[root@cdh2 test]# scala -classpath classes/ ConsoleTest
Please enter your input : cons test
Thanks, you just typed: cons test
[root@cdh2 test]# scala -classpath classes/ ConsoleTest
Please enter your input : objectName shouldn't the same as Console.API
Thanks, you just typed: objectName shouldn't the same as Console.API
[root@cdh2 test]# cat ConsoleTest.scala
object ConsoleTest{
def main(args: Array[String]) {
print("Please enter your input : " )
val line = Console.readLine()
println("Thanks, you just typed: " + line)
}
}
[root@cdh2 test]# vim Source.scala
[root@cdh2 test]# mv Source.scala SourceTest.scala
[root@cdh2 test]# scalac -d classes/ SourceTest.scala
[root@cdh2 test]# scala -classpath classes/ SourceTest
Following is the content read:
Hello Scala[root@cdh2 test]# ll
total 120
drwxr-xr-x 2 root root 4096 Jul 5 00:58 bak
-rw-r--r-- 1 root root 330 Jul 4 19:45 CaseTest2.scala
-rw-r--r-- 1 root root 354 Jul 4 20:07 CaseTest3.scala
-rw-r--r-- 1 root root 263 Jul 4 19:38 CaseTest.scala
drwxr-xr-x 2 root root 4096 Jul 5 01:56 classes
-rw-r--r-- 1 root root 197 Jul 5 01:51 ConsoleTest.scala
-rw-r--r-- 1 root root 475 Jul 4 23:37 File1.scala
-rw-r--r-- 1 root root 529 Jul 4 23:40 File2.scala
-rw-r--r-- 1 root root 411 Jul 4 23:32 File.scala
-rw-r--r-- 1 root root 189 Jul 5 01:26 FileWR.scala
-rw-r--r-- 1 root root 585 Jul 4 20:15 ForTest.scala
-rw-r--r-- 1 root root 104 Jul 4 18:44 HelloWorld2.scala
-rw-r--r-- 1 root root 88 Jul 4 04:18 HelloWorld.scala
-rwxr-xr-x 1 root root 193 Jul 4 04:06 person.sh
-rw-r--r-- 1 root root 234 Jul 4 22:12 RegexD1.scala
-rw-r--r-- 1 root root 250 Jul 4 22:18 RegexD2.scala
-rw-r--r-- 1 root root 349 Jul 4 22:07 RegexD.scala
-rw-r--r-- 1 root root 231 Jul 4 21:54 RegexReplace.scala
-rw-r--r-- 1 root root 270 Jul 4 21:48 RegexTest1.scala
-rw-r--r-- 1 root root 243 Jul 4 20:49 RegexTest2.scala
-rwxr-xr-x 1 root root 166 Jul 4 04:13 script.sh
-rw-r--r-- 1 root root 602 Jul 5 00:00 Some1.scala
-rw-r--r-- 1 root root 633 Jul 5 00:01 Some.scala
-rw-r--r-- 1 root root 205 Jul 5 01:55 SourceTest.scala
-rw-r--r-- 1 root root 769 Jul 4 19:07 Test2.scala
-rw-r--r-- 1 root root 426 Jul 4 19:13 Test3.scala
-rw-r--r-- 1 root root 408 Jul 5 00:08 TestExtractor.scala
-rw-r--r-- 1 root root 493 Jul 4 19:00 Test.scala
-rw-r--r-- 1 root root 11 Jul 5 01:27 test.txt
-rw-r--r-- 1 root root 815 Jul 4 19:31 TraitTest.scala
[root@cdh2 test]# cat SourceTest.scala
import scala.io.Source
object SourceTest {
def main(args: Array[String]) {
println("Following is the content read:" )
Source.fromFile("test.txt" ).foreach{
print
}
}
}
[root@cdh2 test]# cat test.txt
Hello Scala[root@cdh2 test]# vim test.txt
[root@cdh2 test]# cat test.txt
Hello Scala
lyc sty scala
[root@cdh2 test]# scala -classpath classes/ SourceTest
Following is the content read:
Hello Scala
lyc sty scala
[root@cdh2 test]# cat SourceTest.scala
import scala.io.Source
object SourceTest {
def main(args: Array[String]) {
println("Following is the content read:" )
Source.fromFile("test.txt" ).foreach{
print
}
}
}
[root@cdh2 test]# cat ConsoleTest.scala
object ConsoleTest{
def main(args: Array[String]) {
print("Please enter your input : " )
val line = Console.readLine()
println("Thanks, you just typed: " + line)
}
}
[root@cdh2 test]# cp ConsoleTestcala ConsoleTes.scala
cp: cannot stat `ConsoleTestcala': No such file or directory
[root@cdh2 test]# cp ConsoleTest.cala ConsoleTes.scala
cp: cannot stat `ConsoleTest.cala': No such file or directory
[root@cdh2 test]# cp ConsoleTest.scala ConsoleTes.scala
[root@cdh2 test]# vim ConsoleTes.scala
[root@cdh2 test]# scala -classpath classes/ ConsoleTes
Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target: ConsoleTes
at scala.sys.package$.error(package.scala:27)
at scala.tools.nsc.GenericRunnerCommand.scala$tools$nsc$GenericRunnerCommand$$guessHowToRun(GenericRunnerCommand.scala:38)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.Option.getOrElse(Option.scala:108)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:17)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:33)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# scalac -d classes/ ConsoleTes.scala
[root@cdh2 test]# scala -classpath classes/ ConsoleTes
Please enter your input in readLine() : read line minus ()
Thanks, you just typed: read line minus ()
[root@cdh2 test]# cat ConsoleTes.scala
object ConsoleTes{
def main(args: Array[String]) {
print("Please enter your input in readLine() : " )
//val line = Console.readLine()
val line = Console.readLine
println("Thanks, you just typed: " + line)
}
}
[root@cdh2 test]# vim ArrayTest.scala
[root@cdh2 test]# scalac -d classes/ ArrayTest.scala
[root@cdh2 test]# scala -classpath classes/ ArrayTest
1.9
2.9
3.4
3.5
1.9
2.9
3.4
3.5
Total is 11.7
Max is 3.5
[root@cdh2 test]# cat ArrayTest.scala
object ArrayTest {
def main(args: Array[String]) {
var myList = Array(1.9, 2.9, 3.4, 3.5)
// Print all the array elements
for ( x <- myList ) {
println( x )
}
println
myList.foreach{
println
}
// Summing all elements
var total = 0.0;
for ( i <- 0 to (myList.length - 1)) {
total += myList(i);
}
println("Total is " + total);
// Finding the largest element
var max = myList(0);
for ( i <- 1 to (myList.length - 1) ) {
if (myList(i) > max) max = myList(i);
}
println("Max is " + max);
}
}
[root@cdh2 test]# vim Matrix.scala
[root@cdh2 test]# mv Matrix.scala MatrixTest.scala
[root@cdh2 test]# scalac -d classes/ MatrixTest.scala
[root@cdh2 test]# scala -classpath classes/ MatrixTest
0 1 2
0 1 2
0 1 2
[root@cdh2 test]# scala -classpath classes/ MatrixTest
0 1 2
0 1 2
0 1 2
[root@cdh2 test]# cat Matrix.scala
cat: Matrix.scala: No such file or directory
[root@cdh2 test]# cat MatrixTest.scala
import Array._
object MatrixTest {
def main(args: Array[String]) {
var myMatrix = ofDim[Int](3,3)
// build a matrix
for (i <- 0 to 2) {
for ( j <- 0 to 2) {
myMatrix(i)(j) = j;
}
}
// Print two dimensional array
for (i <- 0 to 2) {
for ( j <- 0 to 2) {
print(" " + myMatrix(i)(j));
}
println();
}
}
}
[root@cdh2 test]# vim ConcatArray.scala
[root@cdh2 test]# scalac -d classes/ Con
ConcatArray.scala ConsoleTes.scala ConsoleTest.scala
[root@cdh2 test]# scalac -d classes/ ConcatArray.scala
[root@cdh2 test]# scala -classpath classes/ ConcatArray
1.9
2.9
3.4
3.5
8.9
7.9
0.4
1.5
8
[root@cdh2 test]# cat ConcatArray.scala
import Array._
object ConcatArray {
def main(args: Array[String]) {
var myList1 = Array(1.9, 2.9, 3.4, 3.5)
var myList2 = Array(8.9, 7.9, 0.4, 1.5)
var myList3 = concat( myList1, myList2)
// Print all the array elements
for ( x <- myList3 ) {
println( x )
}
println(myList3.size)
}
}
[root@cdh2 test]# vim RangeArray.scala
[root@cdh2 test]# scalac -d classes/ RangeArray.scala
RangeArray.scala:3: error: not found: value range
var myList1 = range(10, 20, 2)
^
RangeArray.scala:4: error: not found: value range
var myList2 = range(10,20)
^
RangeArray.scala:5: error: not found: value range
var myList3 = range(10, 20, 3)
^
three errors found
[root@cdh2 test]# scalac -d classes/ RangeArray.scala
RangeArray.scala:3: error: not found: value range
var myList1 = range(10, 20, 2)
^
RangeArray.scala:4: error: not found: value range
var myList2 = range(10,20)
^
RangeArray.scala:5: error: not found: value range
var myList3 = range(10, 20, 3)
^
three errors found
[root@cdh2 test]# vim RangeArray.scala
[root@cdh2 test]# scalac -d classes/ RangeArray.scala
[root@cdh2 test]# scalac -classpath classes/ RangeArray
error: source file 'RangeArray' could not be found
one error found
[root@cdh2 test]# ls -l classes/
total 304
-rw-r--r-- 1 root root 1184 Jul 5 02:16 ArrayTest$$anonfun$main$1.class
-rw-r--r-- 1 root root 1325 Jul 5 02:16 ArrayTest$$anonfun$main$2.class
-rw-r--r-- 1 root root 1338 Jul 5 02:16 ArrayTest$$anonfun$main$3.class
-rw-r--r-- 1 root root 899 Jul 5 02:16 ArrayTest$$anonfun$main$4.class
-rw-r--r-- 1 root root 809 Jul 5 02:16 ArrayTest.class
-rw-r--r-- 1 root root 2322 Jul 5 02:16 ArrayTest$.class
-rw-r--r-- 1 root root 779 Jul 4 19:45 CaseTest2.class
-rw-r--r-- 1 root root 1138 Jul 4 19:45 CaseTest2$.class
-rw-r--r-- 1 root root 779 Jul 4 20:07 CaseTest3.class
-rw-r--r-- 1 root root 1138 Jul 4 20:07 CaseTest3$.class
-rw-r--r-- 1 root root 773 Jul 4 19:42 CaseTest.class
-rw-r--r-- 1 root root 1118 Jul 4 19:42 CaseTest$.class
-rw-r--r-- 1 root root 1192 Jul 5 02:27 ConcatArray$$anonfun$main$1.class
-rw-r--r-- 1 root root 707 Jul 5 02:27 ConcatArray.class
-rw-r--r-- 1 root root 1744 Jul 5 02:27 ConcatArray$.class
-rw-r--r-- 1 root root 637 Jul 5 02:03 ConsoleTes.class
-rw-r--r-- 1 root root 1004 Jul 5 02:03 ConsoleTes$.class
-rw-r--r-- 1 root root 643 Jul 5 01:51 ConsoleTest.class
-rw-r--r-- 1 root root 993 Jul 5 01:51 ConsoleTest$.class
-rw-r--r-- 1 root root 559 Jul 4 19:31 Equal.class
-rw-r--r-- 1 root root 465 Jul 4 19:31 Equal$class.class
-rw-r--r-- 1 root root 605 Jul 4 23:38 File1.class
-rw-r--r-- 1 root root 952 Jul 4 23:38 File1$.class
-rw-r--r-- 1 root root 605 Jul 4 23:40 File2.class
-rw-r--r-- 1 root root 1189 Jul 4 23:40 File2$.class
-rw-r--r-- 1 root root 600 Jul 4 23:37 File.class
-rw-r--r-- 1 root root 950 Jul 4 23:37 File$.class
-rw-r--r-- 1 root root 611 Jul 5 01:27 FileWR.class
-rw-r--r-- 1 root root 728 Jul 5 01:27 FileWR$.class
-rw-r--r-- 1 root root 1815 Jul 4 20:15 ForTest$$anonfun$main$1.class
-rw-r--r-- 1 root root 1707 Jul 4 20:15 ForTest.class
-rw-r--r-- 1 root root 1274 Jul 4 20:15 ForTest$.class
-rw-r--r-- 1 root root 2423 Jul 4 20:15 ForTest$Person.class
-rw-r--r-- 1 root root 1562 Jul 4 20:15 ForTest$Person$.class
-rw-r--r-- 1 root root 637 Jul 4 04:18 HelloWorld.class
-rw-r--r-- 1 root root 606 Jul 4 04:18 HelloWorld$.class
-rw-r--r-- 1 root root 1967 Jul 4 19:07 Location.class
-rw-r--r-- 1 root root 1398 Jul 5 02:22 MatrixTest$$anonfun$main$1$$anonfun$apply$mcVI$sp$1.class
-rw-r--r-- 1 root root 1618 Jul 5 02:22 MatrixTest$$anonfun$main$1.class
-rw-r--r-- 1 root root 1755 Jul 5 02:22 MatrixTest$$anonfun$main$2$$anonfun$apply$mcVI$sp$2.class
-rw-r--r-- 1 root root 1648 Jul 5 02:22 MatrixTest$$anonfun$main$2.class
-rw-r--r-- 1 root root 740 Jul 5 02:22 MatrixTest.class
-rw-r--r-- 1 root root 1420 Jul 5 02:22 MatrixTest$.class
-rw-r--r-- 1 root root 1385 Jul 5 03:19 RangeArray$$anonfun$main$1.class
-rw-r--r-- 1 root root 1385 Jul 5 03:19 RangeArray$$anonfun$main$2.class
-rw-r--r-- 1 root root 901 Jul 5 03:19 RangeArray$$anonfun$main$3.class
-rw-r--r-- 1 root root 780 Jul 5 03:19 RangeArray.class
-rw-r--r-- 1 root root 1282 Jul 5 03:19 RangeArray$.class
-rw-r--r-- 1 root root 618 Jul 4 22:12 RegexD1.class
-rw-r--r-- 1 root root 1262 Jul 4 22:12 RegexD1$.class
-rw-r--r-- 1 root root 618 Jul 4 22:18 RegexD2.class
-rw-r--r-- 1 root root 1278 Jul 4 22:18 RegexD2$.class
-rw-r--r-- 1 root root 611 Jul 4 22:07 RegexD.class
-rw-r--r-- 1 root root 1263 Jul 4 22:07 RegexD$.class
-rw-r--r-- 1 root root 649 Jul 4 22:05 RegexReplace.class
-rw-r--r-- 1 root root 1284 Jul 4 22:05 RegexReplace$.class
-rw-r--r-- 1 root root 637 Jul 4 21:48 RegexTest1.class
-rw-r--r-- 1 root root 1324 Jul 4 21:48 RegexTest1$.class
-rw-r--r-- 1 root root 637 Jul 4 21:46 RegexTest2.class
-rw-r--r-- 1 root root 1278 Jul 4 21:46 RegexTest2$.class
-rw-r--r-- 1 root root 1052 Jul 5 00:02 Some.class
-rw-r--r-- 1 root root 1762 Jul 5 00:02 Some$.class
-rw-r--r-- 1 root root 901 Jul 5 01:56 SourceTest$$anonfun$main$1.class
-rw-r--r-- 1 root root 700 Jul 5 01:56 SourceTest.class
-rw-r--r-- 1 root root 1101 Jul 5 01:56 SourceTest$.class
-rw-r--r-- 1 root root 605 Jul 4 19:07 Test2.class
-rw-r--r-- 1 root root 579 Jul 4 19:07 Test2$.class
-rw-r--r-- 1 root root 605 Jul 4 19:14 Test3.class
-rw-r--r-- 1 root root 1137 Jul 4 19:14 Test3$.class
-rw-r--r-- 1 root root 605 Jul 4 20:48 Test.class
-rw-r--r-- 1 root root 1266 Jul 4 20:48 Test$.class
-rw-r--r-- 1 root root 949 Jul 5 00:09 TestExtractor.class
-rw-r--r-- 1 root root 1540 Jul 5 00:09 TestExtractor$.class
-rw-r--r-- 1 root root 630 Jul 4 19:31 TraitTest.class
-rw-r--r-- 1 root root 1163 Jul 4 19:31 TraitTest$.class
-rw-r--r-- 1 root root 1480 Jul 4 19:31 Yiibai.class
[root@cdh2 test]# vim RangeArray.scala
[root@cdh2 test]# scalac -d classes/ RangeArray.scala
[root@cdh2 test]# scala -classpath classes/ RangeArray
10 12 14 16 18
10 11 12 13 14 15 16 17 18 19
10131619[root@cdh2ls -l classes/ngeArray
total 304
-rw-r--r-- 1 root root 1184 Jul 5 02:16 ArrayTest$$anonfun$main$1.class
-rw-r--r-- 1 root root 1325 Jul 5 02:16 ArrayTest$$anonfun$main$2.class
-rw-r--r-- 1 root root 1338 Jul 5 02:16 ArrayTest$$anonfun$main$3.class
-rw-r--r-- 1 root root 899 Jul 5 02:16 ArrayTest$$anonfun$main$4.class
-rw-r--r-- 1 root root 809 Jul 5 02:16 ArrayTest.class
-rw-r--r-- 1 root root 2322 Jul 5 02:16 ArrayTest$.class
-rw-r--r-- 1 root root 779 Jul 4 19:45 CaseTest2.class
-rw-r--r-- 1 root root 1138 Jul 4 19:45 CaseTest2$.class
-rw-r--r-- 1 root root 779 Jul 4 20:07 CaseTest3.class
-rw-r--r-- 1 root root 1138 Jul 4 20:07 CaseTest3$.class
-rw-r--r-- 1 root root 773 Jul 4 19:42 CaseTest.class
-rw-r--r-- 1 root root 1118 Jul 4 19:42 CaseTest$.class
-rw-r--r-- 1 root root 1192 Jul 5 02:27 ConcatArray$$anonfun$main$1.class
-rw-r--r-- 1 root root 707 Jul 5 02:27 ConcatArray.class
-rw-r--r-- 1 root root 1744 Jul 5 02:27 ConcatArray$.class
-rw-r--r-- 1 root root 637 Jul 5 02:03 ConsoleTes.class
-rw-r--r-- 1 root root 1004 Jul 5 02:03 ConsoleTes$.class
-rw-r--r-- 1 root root 643 Jul 5 01:51 ConsoleTest.class
-rw-r--r-- 1 root root 993 Jul 5 01:51 ConsoleTest$.class
-rw-r--r-- 1 root root 559 Jul 4 19:31 Equal.class
-rw-r--r-- 1 root root 465 Jul 4 19:31 Equal$class.class
-rw-r--r-- 1 root root 605 Jul 4 23:38 File1.class
-rw-r--r-- 1 root root 952 Jul 4 23:38 File1$.class
-rw-r--r-- 1 root root 605 Jul 4 23:40 File2.class
-rw-r--r-- 1 root root 1189 Jul 4 23:40 File2$.class
-rw-r--r-- 1 root root 600 Jul 4 23:37 File.class
-rw-r--r-- 1 root root 950 Jul 4 23:37 File$.class
-rw-r--r-- 1 root root 611 Jul 5 01:27 FileWR.class
-rw-r--r-- 1 root root 728 Jul 5 01:27 FileWR$.class
-rw-r--r-- 1 root root 1815 Jul 4 20:15 ForTest$$anonfun$main$1.class
-rw-r--r-- 1 root root 1707 Jul 4 20:15 ForTest.class
-rw-r--r-- 1 root root 1274 Jul 4 20:15 ForTest$.class
-rw-r--r-- 1 root root 2423 Jul 4 20:15 ForTest$Person.class
-rw-r--r-- 1 root root 1562 Jul 4 20:15 ForTest$Person$.class
-rw-r--r-- 1 root root 637 Jul 4 04:18 HelloWorld.class
-rw-r--r-- 1 root root 606 Jul 4 04:18 HelloWorld$.class
-rw-r--r-- 1 root root 1967 Jul 4 19:07 Location.class
-rw-r--r-- 1 root root 1398 Jul 5 02:22 MatrixTest$$anonfun$main$1$$anonfun$apply$mcVI$sp$1.class
-rw-r--r-- 1 root root 1618 Jul 5 02:22 MatrixTest$$anonfun$main$1.class
-rw-r--r-- 1 root root 1755 Jul 5 02:22 MatrixTest$$anonfun$main$2$$anonfun$apply$mcVI$sp$2.class
-rw-r--r-- 1 root root 1648 Jul 5 02:22 MatrixTest$$anonfun$main$2.class
-rw-r--r-- 1 root root 740 Jul 5 02:22 MatrixTest.class
-rw-r--r-- 1 root root 1420 Jul 5 02:22 MatrixTest$.class
-rw-r--r-- 1 root root 1385 Jul 5 03:20 RangeArray$$anonfun$main$1.class
-rw-r--r-- 1 root root 1385 Jul 5 03:20 RangeArray$$anonfun$main$2.class
-rw-r--r-- 1 root root 901 Jul 5 03:20 RangeArray$$anonfun$main$3.class
-rw-r--r-- 1 root root 780 Jul 5 03:20 RangeArray.class
-rw-r--r-- 1 root root 1282 Jul 5 03:20 RangeArray$.class
-rw-r--r-- 1 root root 618 Jul 4 22:12 RegexD1.class
-rw-r--r-- 1 root root 1262 Jul 4 22:12 RegexD1$.class
-rw-r--r-- 1 root root 618 Jul 4 22:18 RegexD2.class
-rw-r--r-- 1 root root 1278 Jul 4 22:18 RegexD2$.class
-rw-r--r-- 1 root root 611 Jul 4 22:07 RegexD.class
-rw-r--r-- 1 root root 1263 Jul 4 22:07 RegexD$.class
-rw-r--r-- 1 root root 649 Jul 4 22:05 RegexReplace.class
-rw-r--r-- 1 root root 1284 Jul 4 22:05 RegexReplace$.class
-rw-r--r-- 1 root root 637 Jul 4 21:48 RegexTest1.class
-rw-r--r-- 1 root root 1324 Jul 4 21:48 RegexTest1$.class
-rw-r--r-- 1 root root 637 Jul 4 21:46 RegexTest2.class
-rw-r--r-- 1 root root 1278 Jul 4 21:46 RegexTest2$.class
-rw-r--r-- 1 root root 1052 Jul 5 00:02 Some.class
-rw-r--r-- 1 root root 1762 Jul 5 00:02 Some$.class
-rw-r--r-- 1 root root 901 Jul 5 01:56 SourceTest$$anonfun$main$1.class
-rw-r--r-- 1 root root 700 Jul 5 01:56 SourceTest.class
-rw-r--r-- 1 root root 1101 Jul 5 01:56 SourceTest$.class
-rw-r--r-- 1 root root 605 Jul 4 19:07 Test2.class
-rw-r--r-- 1 root root 579 Jul 4 19:07 Test2$.class
-rw-r--r-- 1 root root 605 Jul 4 19:14 Test3.class
-rw-r--r-- 1 root root 1137 Jul 4 19:14 Test3$.class
-rw-r--r-- 1 root root 605 Jul 4 20:48 Test.class
-rw-r--r-- 1 root root 1266 Jul 4 20:48 Test$.class
-rw-r--r-- 1 root root 949 Jul 5 00:09 TestExtractor.class
-rw-r--r-- 1 root root 1540 Jul 5 00:09 TestExtractor$.class
-rw-r--r-- 1 root root 630 Jul 4 19:31 TraitTest.class
-rw-r--r-- 1 root root 1163 Jul 4 19:31 TraitTest$.class
-rw-r--r-- 1 root root 1480 Jul 4 19:31 Yiibai.class
[root@cdh2 test]# vim RangeArray.scala
[12]+ Stopped vim RangeArray.scala
[root@cdh2 test]# cat RangeArray.scala
object RangeArray {
def main(args: Array[String]) {
var myList1 = Range(10, 20, 2)
var myList2 = Range(10,20)
var myList3 = Range(10, 20, 3)
// Print all the array elements
for ( x <- myList1 ) {
print( " " + x )
}
println()
for ( x <- myList2 ) {
print( " " + x )
}
println()
myList3.foreach{
print
}
}
}
[root@cdh2 test]# vim RangeArray.scala
[root@cdh2 test]# scalac -d classes/ RangeArray.scala
[root@cdh2 test]# scala -classpath classes/ RangeArray
10 12 14 16 18
10 11 12 13 14 15 16 17 18 19
10131619[root@cdh2vim RangeArray.scalangeArray
[root@cdh2 test]# scalac -d classes/ RangeArray.scala
[root@cdh2 test]# scala -classpath classes/ RangeArray
10 12 14 16 18
10 11 12 13 14 15 16 17 18 19
10131619
[root@cdh2 test]# 注意Range字母的大小写 objectName 和 保留字 别重复哦
[root@cdh2 test]# vim Str.scala
[root@cdh2 test]# scalac -d classes/ Str.scala
[root@cdh2 test]# scala -classpath classes/Str
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> [root@cdh2 test]#
[root@cdh2 test]# scala -classpath classes/ Str
Hello, world!
[root@cdh2 test]# cat Str.scala
object Str {
val greeting: String = "Hello, world!"
def main(args: Array[String]) {
println( greeting )
}
}
[root@cdh2 test]# vim Str.scala
[root@cdh2 test]# scalac -d classes/ Str.scala
[root@cdh2 test]# scala -classpath classes/ Str
Hello, world!
heheha
String Length is : 17
[root@cdh2 test]# cat Str.scala
object Str {
val greeting: String = "Hello, world!"
val greet="heheha"
def main(args: Array[String]) {
println( greeting )
println( greet )
var palindrome = "Dot saw I was Tod";
var len = palindrome.length();
println( "String Length is : " + len );
}
}
[root@cdh2 test]# vim Str.scala
[root@cdh2 test]# scalac -d classes/ Str.scala
[root@cdh2 test]# scala -classpath classes/ Str
Hello, world!
heheha
String Length is : 17
My name is Zara
Dot Dot saw I was Tod
[root@cdh2 test]# vim FormatTest.scala
[root@cdh2 test]# scalac -d classes/ FormatTest.scala
[root@cdh2 test]# scala -classpath classes/ FormatTest
The value of the float variable is 12.456000, while the value of the integer variable is 2000, and the string is Hello, Scala!()
[root@cdh2 test]#
[root@cdh2 test]# cat FormatTest.scala
object FormatTest {
def main(args: Array[String]) {
var floatVar = 12.456
var intVar = 2000
var stringVar = "Hello, Scala!"
var fs = printf("The value of the float variable is " +
"%f, while the value of the integer " +
"variable is %d, and the string " +
"is %s", floatVar, intVar, stringVar)
println(fs)
}
}
[root@cdh2 test]# 最后一步字符串 为什么 自动填充了 () ??
[root@cdh2 test]# vim Factor.scala
[root@cdh2 test]# cp Factor.scala FactorTest.scala
[root@cdh2 test]# scalac -d classes/ FactorTest.scala
[root@cdh2 test]# scala -classpath classes/ FactorTest
muliplier(1) value = 4
muliplier(2) value = 8
[root@cdh2 test]# cat FactorTest.scala
object FactorTest {
def main(args: Array[String]) {
println( "muliplier(1) value = " + multiplier(1) )
println( "muliplier(2) value = " + multiplier(2) )
}
var factor = 4
val multiplier = (i:Int) => i * factor
}
[root@cdh2 test]# vim Fun.scala
[root@cdh2 test]# vim Fun.scala
[root@cdh2 test]# scalac -d classes/ Fun.scala
[root@cdh2 test]# scala -classpath classes/ Fun
Returned Value : 12
[root@cdh2 test]# cat Fun.scala
object Fun {
def main(args: Array[String]) {
println( "Returned Value : " + addInt(5,7) );
}
def addInt( a:Int, b:Int ) : Int = {
var sum:Int = 0
sum = a + b
return sum
}
/*object Hello{
def printMe( ) : Unit = {
println("Hello, Scala!")
}
}*/
}
object Hello{
def printMe( ) : Unit = {
println("Hello, Scala!")
}
}
[root@cdh2 test]# cp Fun.scala Fun2.scala
[root@cdh2 test]# vim Fun2.scala
[root@cdh2 test]# scalac -d classes/ Fun2.scala
Fun2.scala:4: error: not found: type Hello
new Hello().printMe()
^
one error found
[root@cdh2 test]# vim Fun2.scala
[root@cdh2 test]# scalac -d classes/ Fun2.scala
Fun2.scala:4: error: not found: type Hello
(new Hello).printMe()
^
one error found
[root@cdh2 test]# vim Fun2.scala
[root@cdh2 test]# vim Fun2.scala
[root@cdh2 test]# scalac -d classes/ Fun2.scala
[root@cdh2 test]# scala -classpath classes/ Fun2
Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target: Fun2
at scala.sys.package$.error(package.scala:27)
at scala.tools.nsc.GenericRunnerCommand.scala$tools$nsc$GenericRunnerCommand$$guessHowToRun(GenericRunnerCommand.scala:38)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.Option.getOrElse(Option.scala:108)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:17)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:33)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# vim Fun2.scala
[root@cdh2 test]# scalac -d classes/ Fun2.scala
[root@cdh2 test]# scala -classpath classes/ Fun2
Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target: Fun2
at scala.sys.package$.error(package.scala:27)
at scala.tools.nsc.GenericRunnerCommand.scala$tools$nsc$GenericRunnerCommand$$guessHowToRun(GenericRunnerCommand.scala:38)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.Option.getOrElse(Option.scala:108)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:17)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:33)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# vim Fun2.scala
[root@cdh2 test]# scalac -d classes/ Fun2.scala
[root@cdh2 test]# scala -classpath classes/ Fun2
Returned Value : 12
Hello, Scala!
[root@cdh2 test]#
[root@cdh2 test]# scala -classpath classes/ Fun2
Returned Value : 12
Hello, Scala!
[root@cdh2 test]# cat Fun2.scala
object Fun2 {
def main(args: Array[String]) {
println( "Returned Value : " + addInt(5,7) );
(new Hello).printMe()
}
def addInt( a:Int, b:Int ) : Int = {
var sum:Int = 0
sum = a + b
return sum
}
/*object Hello{
def printMe( ) : Unit = {
println("Hello, Scala!")
}
}*/
}
class Hello{
def printMe( ) : Unit = {
println("Hello, Scala!")
}
}
[root@cdh2 test]# object 调用 外面别的方法，Unit 相当于 void.
[root@cdh2 test]# vim Outer.scala
[root@cdh2 test]# scalac -d classes/ Outer.scala
Outer.scala:8: error: method f in class Inner cannot be accessed in Outer.this.Inner
(new Inner).f() // Error: f is not accessible
^
one error found
[root@cdh2 test]# cat Outer.scala
class Outer {
class Inner {
private def f() { println("f") }
class InnerMost {
f() // OK
}
}
(new Inner).f() // Error: f is not accessible
}
[root@cdh2 test]# vim Outer.scala
[root@cdh2 test]# scalac -d classes/ Outer.scala
Outer.scala:3: error: ';' expected but 'def' found.
public def f() { println("f") }
^
one error found
[root@cdh2 test]# vim Outer.scala
[root@cdh2 test]# scalac -d classes/ Outer.scala
[root@cdh2 test]# cat Outer.scala
class Outer {
class Inner {
def f() { println("f") }
class InnerMost {
f() // OK
}
}
(new Inner).f() // Error: f is not accessible
}
[root@cdh2 test]# vim Outer.scala
[root@cdh2 test]# scalac -d classes/ Outer.scala
Outer.scala:3: error: '=' expected but identifier found.
def public f() { println("f") }
^
Outer.scala:4: error: illegal start of simple expression
class InnerMost {
^
two errors found
[root@cdh2 test]# cat Outer.scala
class Outer {
class Inner {
def public f() { println("f") }
class InnerMost {
f() // OK
}
}
(new Inner).f() // Error: f is not accessible
}
[root@cdh2 test]# vim Outer.scala
[root@cdh2 test]# scalac -d classes/ Outer.scala
[root@cdh2 test]# scala -classpath classes/ Outer
java.lang.NoSuchMethodException: Outer.main([Ljava.lang.String;)
at java.lang.Class.getMethod(Class.java:1665)
at scala.tools.nsc.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:74)
at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101)
at scala.tools.nsc.ObjectRunner$.run(ObjectRunner.scala:33)
at scala.tools.nsc.ObjectRunner$.runAndCatch(ObjectRunner.scala:40)
at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:56)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:80)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# cat Outer.scala
class Outer {
class Inner {
def f() { println("f") }
class InnerMost {
f() // OK
}
}
(new Inner).f() // Error: f is not accessible
}
[root@cdh2 test]# cp Outer.scala Outer1.scala
[root@cdh2 test]# scalac -d classes/ Outer1.scala
[root@cdh2 test]# vim Outer1.scala
[root@cdh2 test]# scalac -d classes/ Outer1.scala
[root@cdh2 test]# scala -classpath classes/ Outer1
Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target: Outer1
at scala.sys.package$.error(package.scala:27)
at scala.tools.nsc.GenericRunnerCommand.scala$tools$nsc$GenericRunnerCommand$$guessHowToRun(GenericRunnerCommand.scala:38)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.Option.getOrElse(Option.scala:108)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:17)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:33)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# vim Outer1.scala
[root@cdh2 test]# scalac -d classes/ Outer1.scala
[root@cdh2 test]# scala -classpath classes/ Outer1
java.lang.NoSuchMethodException: Outer1.main is not static
at scala.tools.nsc.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:76)
at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101)
at scala.tools.nsc.ObjectRunner$.run(ObjectRunner.scala:33)
at scala.tools.nsc.ObjectRunner$.runAndCatch(ObjectRunner.scala:40)
at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:56)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:80)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# vim Outer1.scala
[root@cdh2 test]# scalac -d classes/ Outer1.scala
Outer1.scala:8: error: '=' expected but identifier found.
def static main(args: Array[String]) {
^
Outer1.scala:11: error: illegal start of simple expression
}
^
two errors found
[root@cdh2 test]# cat Outer1.scala
class Outer1 {
class Inner {
def f() { println("f") }
class InnerMost {
f() // OK
}
}
def static main(args: Array[String]) {
(new Inner).f() // Error: f is not accessible
}
}
[root@cdh2 test]# vim Outer1.scala
[root@cdh2 test]# scalac -d classes/ Outer1.scala
[root@cdh2 test]# scala -classpath classes/ Outer1
java.lang.NoSuchMethodException: Outer1.main([Ljava.lang.String;)
at java.lang.Class.getMethod(Class.java:1665)
at scala.tools.nsc.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:74)
at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101)
at scala.tools.nsc.ObjectRunner$.run(ObjectRunner.scala:33)
at scala.tools.nsc.ObjectRunner$.runAndCatch(ObjectRunner.scala:40)
at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:56)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:80)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# class 里面 怎么写 main 函数？？
[root@cdh2 test]# scalac -d classes/ ProtectPub.scala
[root@cdh2 test]# scalac -d classes/ Other.scala
[root@cdh2 test]# scalac -d classes/ Outer1.scala
Value of a: 10
Value of a: 10
Value of a: 10
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Value of a: 10[root@cdh2 test]#
[root@cdh2 test]# cat WhileTest1.scala
object WhileTest1 {
def main(args: Array[String]) {
var a = 10;
// An infinite loop.
while( true ){
println( "Value of a: " + a );
}
}
}
[root@cdh2 test]# scalac -d classes/ WhileTest.scala
[root@cdh2 test]# scala -classpath classes/ WhileTest
Value of a: 10
Value of a: 11
Value of a: 12
Value of a: 13
Value of a: 14
Value of a: 15
Value of a: 16
Value of a: 17
Value of a: 18
Value of a: 19
[root@cdh2 test]# cat WhileTest.scala
object WhileTest {
def main(args: Array[String]) {
// Local variable declaration:
var a = 10;
// while loop execution
while( a < 20 ){
println( "Value of a: " + a );
a = a + 1;
}
}
}
[root@cdh2 test]# scalac -d classes/ Outer.scala
[root@cdh2 test]# cat Outer.scala
class Outer {
class Inner {
def f() { println("f") }
class InnerMost {
f() // OK
}
}
(new Inner).f() // Error: f is not accessible
}
[root@cdh2 test]# scalac -d classes/ ProtectPub.scala
[root@cdh2 test]# scalac -d classes/ Other.scala
[root@cdh2 test]# scalac -d classes/ Outer1.scala
[root@cdh2 test]# scalac -d classes/ Fun2.scala
[root@cdh2 test]# scalac -d classes/ Fun1.scala
error: source file 'Fun1.scala' could not be found
one error found
[root@cdh2 test]# scalac -d classes/ Fun.scala
[root@cdh2 test]# cat Fun.scala
object Fun {
def main(args: Array[String]) {
println( "Returned Value : " + addInt(5,7) );
}
def addInt( a:Int, b:Int ) : Int = {
var sum:Int = 0
sum = a + b
return sum
}
/*object Hello{
def printMe( ) : Unit = {
println("Hello, Scala!")
}
}*/
}
object Hello{
def printMe( ) : Unit = {
println("Hello, Scala!")
}
}
[root@cdh2 test]# cat Fun1.scala
cat: Fun1.scala: No such file or directory
[root@cdh2 test]# cat Fun2.scala
object Fun2 {
def main(args: Array[String]) {
println( "Returned Value : " + addInt(5,7) );
(new Hello).printMe()
}
def addInt( a:Int, b:Int ) : Int = {
var sum:Int = 0
sum = a + b
return sum
}
/*object Hello{
def printMe( ) : Unit = {
println("Hello, Scala!")
}
}*/
}
class Hello{
def printMe( ) : Unit = {
println("Hello, Scala!")
}
}
[root@cdh2 test]#
[root@cdh2 test]# cat ProtectPub.scala
package society {
package professional {
class Executive {
private[professional] var workDetails = null
private[society] var friends = null
private[this] var secrets = null
def help(another : Executive) {
println(another.workDetails)
//println(another.secrets) //ERROR
}
}
}
}
[root@cdh2 test]# cat Outer1.scala
class Outer1 {
class Inner {
def f() { println("f") }
class InnerMost {
f() // OK
}
}
//def static main(args: Array[String]) {
(new Inner).f() // Error: f is not accessible
//}
}
[root@cdh2 test]# cat Outer2.scala
cat: Outer2.scala: No such file or directory
[root@cdh2 test]# cat Outer.scala
class Outer {
class Inner {
def f() { println("f") }
class InnerMost {
f() // OK
}
}
(new Inner).f() // Error: f is not accessible
}
[root@cdh2 test]# cat Other.scala
package p {
class Super {
def f() { println("f")}
}
class Sub extends Super {
f()
}
class Other {
(new Super).f() // Error: f is not accessible
}
}
[root@cdh2 test]# cat Other1.scala
cat: Other1.scala: No such file or directory
[root@cdh2 test]#
[root@cdh2 test]# vim BreakTest.scala
[root@cdh2 test]# scalac -d classes/ BreakTest.scala
[root@cdh2 test]# scala -classpath classes/ BreakTest
Value of a: 1
Value of a: 2
Value of a: 3
Value of a: 4
After the loop
[root@cdh2 test]# cat BreakTest.scala
import scala.util.control._
object BreakTest {
def main(args: Array[String]) {
var a = 0;
val numList = List(1,2,3,4,5,6,7,8,9,10);
val loop = new Breaks;
loop.breakable {
for( a <- numList){
println( "Value of a: " + a );
if( a == 4 ){
loop.break;
}
}
}
println( "After the loop" );
}
}
[root@cdh2 test]# vim BreakTest1.scala
[root@cdh2 test]# scalac -d classes/ BreakTest1.scala
[root@cdh2 test]# scala -classpath classes/ BreakTest1
Value of a: 1
Value of b: 11
Value of b: 12
Value of a: 2
Value of b: 11
Value of b: 12
Value of a: 3
Value of b: 11
Value of b: 12
Value of a: 4
Value of b: 11
Value of b: 12
Value of a: 5
Value of b: 11
Value of b: 12
[root@cdh2 test]# cat BreakTest1.scala
import scala.util.control._
object BreakTest1 {
def main(args: Array[String]) {
var a = 0;
var b = 0;
val numList1 = List(1,2,3,4,5);
val numList2 = List(11,12,13);
val outer = new Breaks;
val inner = new Breaks;
outer.breakable {
for( a <- numList1){
println( "Value of a: " + a );
inner.breakable {
for( b <- numList2){
println( "Value of b: " + b );
if( b == 12 ){
inner.break;
}
}
} // inner breakable
}
} // outer breakable.
}
}
[root@cdh2 test]# vim DoWhileTest.scala
[root@cdh2 test]# scalac -d classes/ DoWhileTest.scala
[root@cdh2 test]# scala -classpath classes/ DoWhileTest
Value of a: 10
Value of a: 11
Value of a: 12
Value of a: 13
Value of a: 14
Value of a: 15
Value of a: 16
Value of a: 17
Value of a: 18
Value of a: 19
[root@cdh2 test]# cat DoWhileTest.scala
object DoWhileTest {
def main(args: Array[String]) {
// Local variable declaration:
var a = 10;
// do loop execution
do{
println( "Value of a: " + a );
a = a + 1;
}while( a < 20 )
}
}
[root@cdh2 test]# vim IfTest.scala
[root@cdh2 test]# scalac -d classes/ IfTest.scala
[root@cdh2 test]# scala -classpath classes/ IfTest
This is else statement
[root@cdh2 test]# cat IfTest.scala
object IfTest {
def main(args: Array[String]) {
var x = 30;
if( x < 20 ){
println("This is if statement");
}else{
println("This is else statement");
}
}
}
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> A = 0011 1100
<console>:1: error: ';' expected but integer literal found.
A = 0011 1100
^
scala>
scala> B = 0000 1101
<console>:1: error: ';' expected but integer literal found.
B = 0000 1101
^
scala> A = 00111100
<console>:10: error: not found: value A
val $ires0 = A
^
<console>:7: error: not found: value A
A = 00111100
^
scala> var A = 00111100
A: Int = 37440
scala> var B = 00001101
B: Int = 577
scala> A&B
res0: Int = 576
scala> A|B
res1: Int = 37441
scala> A^B
res2: Int = 36865
scala> ~A
res3: Int = -37441
scala> var A = OX00111100
<console>:7: error: not found: value OX00111100
var A = OX00111100
^
scala> var A = Ox00111100
<console>:7: error: not found: value Ox00111100
var A = Ox00111100
^
scala>
scala>
scala>
scala> var myVar = 10;
myVar: Int = 10
scala> val myVal = "Hello, Scala!";
myVal: java.lang.String = Hello, Scala!
scala> val myVal:String = "Hello, Scala!";
myVal: String = Hello, Scala!
scala> var myVar :Int;
<console>:7: error: only classes can have declared but undefined members
(Note that variables need to be initialized to be defined)
var myVar :Int;
^
scala> val myVal :String;
<console>:7: error: only classes can have declared but undefined members
val myVal :String;
^
scala> var myVar:Int;
<console>:7: error: only classes can have declared but undefined members
(Note that variables need to be initialized to be defined)
var myVar:Int;
^
scala> var myVar = 10;
myVar: Int = 10
scala> val myVal = "Hello, Scala!";
myVal: java.lang.String = Hello, Scala!
scala> val (myVar1: Int, myVar2: String) = Pair(40, "Foo");
myVar1: Int = 40
myVar2: String = Foo
scala> val (myVar1, myVar2) = Pair(40, "Foo");
myVar1: Int = 40
myVar2: java.lang.String = Foo
scala> 0xFFFFFFFF
res4: Int = -1
scala> var A=0xFFFFFFFF
A: Int = -1
scala> var A=0x00111100
A: Int = 1118464
scala> 0
res5: Int = 0
scala> 035
res6: Int = 29
scala> 21
res7: Int = 21
scala> 0
res8: Int = 0
scala> 0xFFFFFFFF
res9: Int = -1
scala> 0777L
res10: Long = 511
scala>
scala>
scala> 0.0
res11: Double = 0.0
scala> 1e30f
res12: Float = 1.0E30
scala> 3.14159f
res13: Float = 3.14159
scala> 1.0e100
res14: Double = 1.0E100
scala> .1
<console>:1: error: ';' expected but double literal found.
res14.1
^
scala> .1
<console>:1: error: ';' expected but double literal found.
res14.1
^
scala> 0.1
res15: Double = 0.1
scala> u0041
<console>:8: error: not found: value u0041
u0041
^
scala> 'u0041'
<console>:1: error: unclosed character literal
'u0041'
^
scala> "u0041"
res17: java.lang.String = u0041
scala> "Hello,
<console>:1: error: unclosed string literal
"Hello,
^
scala> World!"
<console>:1: error: unclosed string literal
World!"
^
scala> [root@cdh2 test]#
[root@cdh2 test]# vim Symb.scala
[root@cdh2 test]# scalac -d classes/ S.scala
Some1.scala Some.scala SourceTest.scala Str.scala Symb.scala
[root@cdh2 test]# scalac -d classes/ Symb.scala
[root@cdh2 test]# scala -classpath classes/ Symb
Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target: Symb
at scala.sys.package$.error(package.scala:27)
at scala.tools.nsc.GenericRunnerCommand.scala$tools$nsc$GenericRunnerCommand$$guessHowToRun(GenericRunnerCommand.scala:38)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.Option.getOrElse(Option.scala:108)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:17)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:33)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# cat Symb.scala
package scala
final case class Symbol private (name: String) {
override def toString: String = "'" + name
}
[root@cdh2 test]# vim Hl.scala
[root@cdh2 test]# scalac -d classes/ Hl.scala
Hl.scala:3: error: unclosed string literal
println("Hello World
^
Hl.scala:5: error: unclosed string literal
" );
^
Hl.scala:6: error: ')' expected but '}' found.
}
^
three errors found
[root@cdh2 test]# vim Hl.scala
[root@cdh2 test]# scalac -d classes/ Hl.scala
[root@cdh2 test]# scala -classpath classes/ H
HelloWorld2.scala HelloWorld.scala Hl.scala
[root@cdh2 test]# scala -classpath classes/ Hl
Hello World
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> import scala.collection.immutable.{TreeMap, TreeSet}
import scala.collection.immutable.{TreeMap, TreeSet}
scala> import scala.collection.mutable.HashMap
import scala.collection.mutable.HashMap
scala> import scala.xml._
import scala.xml._
scala> package com.liftcode.stuff
<console>:1: error: illegal start of definition
package com.liftcode.stuff
^
scala> val s = "hello"; println(s)
hello
s: java.lang.String = hello
scala> val s = "hello"
s: java.lang.String = hello
scala> println(s)
hello
scala> println(s);
hello
scala> [root@cdh2 test]#
[root@cdh2 test]# vim HelloWorld.scala
[13]+ Stopped vim HelloWorld.scala
[root@cdh2 test]# vim HelloWorld23.scala
[root@cdh2 test]# scalac -d classes/ HelloWorld2
HelloWorld23.scala HelloWorld2.scala
[root@cdh2 test]# scalac -d classes/ HelloWorld23.scala
[root@cdh2 test]# scala -classpath classes/ HelloWorld23
Hello, world!
[root@cdh2 test]# cat HelloWorld23.scala
object HelloWorld23{
/* This is my first java program.
* This will print 'Hello World' as the output
* This is an example of multi-line comments.
*/
def main(args: Array[String]) {
// Prints Hello World
// This is also an example of single line comment.
println("Hello, world!")
}
}
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> println("Hello, Scala!");
Hello, Scala!
scala> !scala -version
<console>:8: error: object unary_! is not a member of package scala
!scala -version
^
scala> !scala -version
<console>:8: error: object unary_! is not a member of package scala
!scala -version
^
scala> [root@cdh2 test]#
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala>
[root@cdh2 test]# scala -version
Scala code runner version 2.9.3 -- Copyright 2002-2011, LAMP/EPFL
[root@cdh2 test]#
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> object HelloWorld {
| def main(args: Array[String]) {
| println("Hello, world!")
| }
| }
defined module HelloWorld
scala> HelloWorld.main(null);
Hello, world!
scala>
[root@cdh2 network-scripts]# cd /user/local/
[root@cdh2 local]# ll
total 1134428
drwxr-xr-x 11 root root 4096 Jun 30 16:22 apache-storm-0.9.2-incubating
drwxr-xr-x 5 root root 4096 Apr 21 2012 examples-ch02-getting_started-master
drwxr-xr-x 5 1000 1000 4096 Jun 30 20:23 ez_setup-0.9
-rwxr-xr-x 1 root root 6577 Jun 30 17:59 ez_setup-0.9.tar.gz
-rw-r--r-- 1 root root 12402 Jun 2 06:15 ez_setup.py
drwxr-xr-x 10 root root 4096 Jun 16 16:19 hadoop-2.6.0
drwxr-xr-x 9 root root 4096 Jun 27 08:40 hbase-0.98.20-hadoop2
drwxr-xr-x 8 root root 4096 Jun 16 02:50 jdk
drwxr-xr-x 10 root root 4096 Jun 27 23:49 jzmq
drwxr-xr-x 6 root root 4096 Jun 29 03:24 kafka_2.9.2-0.8.1.1
drwxrwxr-x 16 1000 1000 4096 Jul 1 00:09 Python-3.4.3
-rw-r--r-- 1 root root 19554643 Feb 25 2015 Python-3.4.3.tgz
drwxr-xr-x 8 119 129 4096 Jun 17 08:35 scala-2.9.3
drwxr-xr-x 9 root root 4096 Jun 30 22:34 setuptools-23.1.0
-rw-r--r-- 1 root root 648277 Jun 30 22:02 setuptools-23.1.0.zip
drwxr-xr-x 13 hadoop hadoop 4096 Jun 17 09:03 spark-1.4.0-bin-hadoop2.6
drwxrwxrwx 4 1000 users 4096 Jun 30 23:49 sqlite-3.6.20
-rwxr-xr-x 1 root root 1407934 Jun 30 23:43 sqlite-amalgamation-3.6.20.tar.gz
drwxr-xr-x 4 root root 4096 Jun 28 18:07 src_bak
drwxr-xr-x 2 root root 4096 Jun 28 23:01 src_old
-rwxr-xr-x 1 root root 1203927040 Jun 28 18:03 src_old.tar
drwxrwxr-x 11 1000 1000 4096 Jun 27 23:44 zeromq-4.1.2
drwxr-xr-x 11 1000 1000 4096 Jun 29 23:31 zookeeper-3.4.6
drwxr-xr-x 11 root root 4096 Jun 29 23:30 zookeeper-3.4.6_1
drwxr-xr-x 11 root root 4096 Jun 29 23:30 zookeeper-3.4.6_2
drwxr-xr-x 11 root root 4096 Jun 29 22:14 zookeeper-3.4.6_3
-rw-r--r-- 1 root root 19117 Jul 1 00:03 zookeeper.out
[root@cdh2 local]# mkdir test
[root@cdh2 local]# cd test/
[root@cdh2 test]# ll
total 0
[root@cdh2 test]# pwd
/user/local/test
[root@cdh2 test]# touch script.sh
[root@cdh2 test]# vim script.sh
[root@cdh2 test]# ./script.sh
bash: ./script.sh: Permission denied
[root@cdh2 test]# ll
total 4
-rw-r--r-- 1 root root 176 Jul 4 03:54 script.sh
[root@cdh2 test]# chmod +x script.sh
[root@cdh2 test]# ll
total 4
-rwxr-xr-x 1 root root 176 Jul 4 03:54 script.sh
[root@cdh2 test]# ./script.sh
error: script file does not close its header with !# or ::!#
one error found
[root@cdh2 test]# cat script.sh
#!/bin/sh
exec scala "$0" "$@"
!#
object HelloWorld {
def main(args: Array[String]) {
println("Hello, world! " + args.toList)
}
}
HelloWorld.main(args)
[root@cdh2 test]# touch person.sh
[root@cdh2 test]# vim person.sh
[root@cdh2 test]# chmod +x person.sh
[root@cdh2 test]# ll
total 8
-rwxr-xr-x 1 root root 193 Jul 4 04:06 person.sh
-rwxr-xr-x 1 root root 176 Jul 4 03:54 script.sh
[root@cdh2 test]# pe
peekfd perl perl5.10.1 perlbug perldoc perlthanks perror pethtool
[root@cdh2 test]# ll
total 8
-rwxr-xr-x 1 root root 193 Jul 4 04:06 person.sh
-rwxr-xr-x 1 root root 176 Jul 4 03:54 script.sh
[root@cdh2 test]# ./person.sh
Person(Al)
[root@cdh2 test]# cat script.sh
#!/bin/sh
exec scala "$0" "$@"
!#
object HelloWorld {
def main(args: Array[String]) {
println("Hello, world! " + args.toList)
}
}
HelloWorld.main(args)
[root@cdh2 test]# cat person.sh
#!/bin/sh
exec scala "$0" "$@"
!#
case class Person(name: String)
object HelloWorld {
def main(args: Array[String]) {
val al = Person("Al")
println(al)
}
}
HelloWorld.main(args)
[root@cdh2 test]# vim script.sh
[root@cdh2 test]# ./script.sh
Hello, world! List()
[root@cdh2 test]# ./script.sh hahah
Hello, world! List(hahah)
[root@cdh2 test]# ./script.sh haha
Hello, world! List(haha)
[root@cdh2 test]# cat person.sh
#!/bin/sh
exec scala "$0" "$@"
!#
case class Person(name: String)
object HelloWorld {
def main(args: Array[String]) {
val al = Person("Al")
println(al)
}
}
HelloWorld.main(args)
[root@cdh2 test]#
============================
history
1105 ls -l
1106 vi __init__.py
1107 cd ..
1108 pwd
1109 python manage.py runserver 0.0.0.0:8000
1110 cat HelloWorld/urls.py
1111 vim HelloWorld/urls.py
1112 cat HelloWorld/urls.py
1113 python manage.py runserver 0.0.0.0:8000
1114 pwd
1115 vim HelloWorld/urls.py
1116 pwd
1117 tree
1118 cd HelloWorld/
1119 ls -l
1120 rm -rf __pycache__/
1121 ls -l
1122 python manage.py runserver 0.0.0.0:8000
1123 cd ..
1124 python manage.py runserver 0.0.0.0:8000
1125 vim HelloWorld/urls.py
1126 cd HelloWorld/
1127 rm -rf __pycache__/
1128 cd ..
1129 python manage.py runserver 0.0.0.0:8000
1130 cd HelloWorld/
1131 pwd
1132 cd HelloWorld/
1133 ll
1134 pwd
1135 ll- l
1136 cd ..
1137 ll
1138 ls -lre
1139 ls -ltr
1140 django-admin.py startproject HelloWorld
1141 ll
1142 python
1143 ifconfig
1144 service network restart
1145 ifconfig
1146 cat /etc/profile
1147 cat /etc/hosts
1148 service network restart
1149 cd /etc/sysconfig/
1150 ll
1151 cd network-scripts
1152 ll
1153 ls -ltr
1154 cat ifcfg-eth0
1155 ifconfig
1156 service network restart
1157 ifconfig
1158 service network restart
1159 ifconfig
1160 vim ifcfg-eth0
1161 cat /etc/hosts
1162 vim /etc/hosts
1163 cat /etc/hosts
1164 cat ifcfg-eth0
1165 service network restart
1166 ping 192.168.3.120
1167 ifconfig
1168 service network restart
1169 ifconfig
1170 scala
1171 ll
1172 pwd
1173 cd /user/local/
1174 ll
1175 mkdir test
1176 cd test/
1177 ll
1178 pwd
1179 touch script.sh
1180 vim script.sh
1181 ./script.sh
1182 ll
1183 chmod +x script.sh
1184 ll
1185 ./script.sh
1186 cat script.sh
1187 touch person.sh
1188 vim person.sh
1189 chmod +x person.sh
1190 ll
1191 ./person.sh
1192 cat script.sh
1193 cat person.sh
1194 vim script.sh
1195 ./script.sh
1196 ./script.sh hahah
1197 ./script.sh haha
1198 cat person.sh
1199 ll
1200 mkdir classes
1201 ll
1202 touch HelloWorld.scala
1203 vim HelloWorld.scala
1204 ls -l classes/
1205 scalac -d classes HelloWorld.scala
1206 ls -l classes/
1207 scala HelloWorld
1208 scala -classpath classes HelloWorld
1209 touch application.scala
1210 vim application.scala
1211 cat application.scala
1212 vim application.scala
1213 cat application.scala
1214 scalac -d classes application.scala
1215 ls -l classes/
1216 mv application.scala HelloWorld2.scala
1217 ls -l classes/
1218 ll
1219 ls -l classes/
1220 rm -rf *2*
1221 ll
1222 ls -l classes/
1223 rm -rf classes/*2*
1224 ll
1225 ls -l classes/
1226 touch application.scala
1227 vim application.scala
1228 cat application.scala
1229 mv application.scala HelloWorld2.scala
1230 ls -l classes/
1231 scalac -d classes HelloWorld2.scala
1232 LL
1233 ll
1234 ls -l classes/
1235 scala classes/HelloWorld2
1236 scala HelloWorld2
1237 ll
1238 scala -d classes HelloWorld2
1239 scala -d classes HelloWorld2.scala
1240 scala -classpath classes HelloWorld2.scala
1241 ls -l classes/
1242 rm -rf classes/*2*
1243 ls -l classes/
1244 scalac -d classes HelloWorld2.scala
1245 ls -l classes/
1246 vim HelloWorld2.scala
1247 rm -rf classes/*2*
1248 ls -l classes/
1249 scalac -d classes HelloWorld2.scala
1250 history
[root@cdh2 test]#
[root@cdh2 test]#
[root@cdh2 test]# ll
total 20
drwxr-xr-x 2 root root 4096 Jul 4 18:44 classes
-rw-r--r-- 1 root root 104 Jul 4 18:44 HelloWorld2.scala
-rw-r--r-- 1 root root 88 Jul 4 04:18 HelloWorld.scala
-rwxr-xr-x 1 root root 193 Jul 4 04:06 person.sh
-rwxr-xr-x 1 root root 166 Jul 4 04:13 script.sh
[root@cdh2 test]# vim Test.scala
[root@cdh2 test]# scalac -d classes HelloWorld2.scala
HelloWorld2.scala:1: error: expected class or object definition
#!/bin/sh
^
HelloWorld2.scala:2: error: expected class or object definition
exec scala "$0" "$@"
^
HelloWorld2.scala:3: error: expected class or object definition
!#
^
three errors found
[root@cdh2 test]# scalac -d classes Test.scala.scala
error: source file 'Test.scala.scala' could not be found
one error found
[root@cdh2 test]# ls -l classes/
total 8
-rw-r--r-- 1 root root 637 Jul 4 04:18 HelloWorld.class
-rw-r--r-- 1 root root 606 Jul 4 04:18 HelloWorld$.class
[root@cdh2 test]# scalac -d classes Test.scala
[root@cdh2 test]# scala Test.scala
[root@cdh2 test]# scala -classpath classes Test
Yiibai x location : 20
Yiibai y location : 30
[root@cdh2 test]# vim Test.scala
[root@cdh2 test]# ls -l classes/
total 20
-rw-r--r-- 1 root root 637 Jul 4 04:18 HelloWorld.class
-rw-r--r-- 1 root root 606 Jul 4 04:18 HelloWorld$.class
-rw-r--r-- 1 root root 599 Jul 4 18:58 Test.class
-rw-r--r-- 1 root root 567 Jul 4 18:58 Test$.class
-rw-r--r-- 1 root root 1897 Jul 4 18:58 Yiibai.class
[root@cdh2 test]# scala -d classes Test.scala
[root@cdh2 test]# scalac -classpath classes Test
error: source file 'Test' could not be found
one error found
[root@cdh2 test]# ls -l classes/
total 20
-rw-r--r-- 1 root root 637 Jul 4 04:18 HelloWorld.class
-rw-r--r-- 1 root root 606 Jul 4 04:18 HelloWorld$.class
-rw-r--r-- 1 root root 599 Jul 4 18:58 Test.class
-rw-r--r-- 1 root root 567 Jul 4 18:58 Test$.class
-rw-r--r-- 1 root root 1897 Jul 4 18:58 Yiibai.class
[root@cdh2 test]# scalac -d classes Test.scala
[root@cdh2 test]# scala -classpath classes Test
Yiibai x-0 location : 10
Yiibai y-0 location : 20
Yiibai x location : 20
Yiibai y location : 30
[root@cdh2 test]# vim Test2.scala
[root@cdh2 test]# scalac -d classes Test2.scala
[root@cdh2 test]# scala -classpath classes Test2
Yiibai x location : 20
Yiibai y location : 30
Yiibai z location : 20
[root@cdh2 test]# cat Test2.scala
import java.io._
class Yiibai(val xc: Int, val yc: Int) {
var x: Int = xc
var y: Int = yc
def move(dx: Int, dy: Int) {
x = x + dx
y = y + dy
println ("Yiibai x location : " + x);
println ("Yiibai y location : " + y);
}
}
class Location(override val xc: Int, override val yc: Int,
val zc :Int) extends Yiibai(xc, yc){
var z: Int = zc
def move(dx: Int, dy: Int, dz: Int) {
x = x + dx
y = y + dy
z = z + dz
println ("Yiibai x location : " + x);
println ("Yiibai y location : " + y);
println ("Yiibai z location : " + z);
}
}
object Test2 {
def main(args: Array[String]) {
val loc = new Location(10, 20, 15);
// Move to a new location
loc.move(10, 10, 5);
}
}
[root@cdh2 test]# scala -classpath classes Test2
Yiibai x location : 20
Yiibai y location : 30
Yiibai z location : 20
[root@cdh2 test]# scala -classpath classes Test
Yiibai x location : 20
Yiibai y location : 30
[root@cdh2 test]# vim Test3.scala
[root@cdh2 test]# cat Test3.scala
import java.io._
class Yiibai(val xc: Int, val yc: Int) {
var x: Int = xc
var y: Int = yc
def move(dx: Int, dy: Int) {
x = x + dx
y = y + dy
}
}
object Test3 {
def main(args: Array[String]) {
val yiibai = new Yiibai(10, 20)
printYiibai
def printYiibai{
println ("Yiibai x location : " + yiibai.x);
println ("Yiibai y location : " + yiibai.y);
}
}
}
[root@cdh2 test]# scalac -d classes Test3
error: source file 'Test3' could not be found
one error found
[root@cdh2 test]# scalac -d classes Test3.scala
[root@cdh2 test]# scala -classpath classes Test3
Yiibai x location : 10
Yiibai y location : 20
[root@cdh2 test]# vim Test3.scala
[root@cdh2 test]# cat Test3.scala
import java.io._
class Yiibai(val xc: Int, val yc: Int) {
var x: Int = xc
var y: Int = yc
def move(dx: Int, dy: Int) {
x = x + dx
y = y + dy
}
}
object Test3 {
def main(args: Array[String]) {
val yiibai = new Yiibai(10, 20)
printYiibai
def printYiibai{
println ("Yiibai--x location : " + yiibai.x);
println ("Yiibai--y location : " + yiibai.y);
}
}
}
[root@cdh2 test]# scalac -d classes Test3.scala
SC[root@cdh2 test]# scala -classpath classes Test3
Yiibai--x location : 10
Yiibai--y location : 20
[root@cdh2 test]# vim TraitTest.scala
[root@cdh2 test]# scalac -d classes TraitTest.scala
[root@cdh2 test]# scala -classpath classes TraitTest
false
true
true
[root@cdh2 test]# cat TraitTest.scala
trait Equal {
def isEqual(x: Any): Boolean
def isNotEqual(x: Any): Boolean = !isEqual(x)
}
class Yiibai(xc: Int, yc: Int) extends Equal {
var x: Int = xc
var y: Int = yc
def isEqual(obj: Any) =
obj.isInstanceOf[Yiibai] &&
obj.asInstanceOf[Yiibai].x == x
}
object TraitTest {
def main(args: Array[String]) {
val p1 = new Yiibai(2, 3)
val p2 = new Yiibai(2, 4)
val p3 = new Yiibai(3, 3)
println(p1.isNotEqual(p2))
println(p1.isNotEqual(p3))
println(p1.isNotEqual(2))
}
}
[root@cdh2 test]# vim TraitTest.scala
[root@cdh2 test]# scalac -d classes TraitTest.scala
TraitTest.scala:30: error: ')' expected but '(' found.
println(p1.isEqual(new(Yiibai(2,5))))
^
TraitTest.scala:30: error: ';' expected but ')' found.
println(p1.isEqual(new(Yiibai(2,5))))
^
two errors found
[root@cdh2 test]# vim TraitTest.scala
[root@cdh2 test]# scalac -d classes TraitTest.scala
[root@cdh2 test]# scala -classpath classes TraitTest
false
true
true
true
false
false
true
false
true
true
[root@cdh2 test]# cat TraitTest.scala
trait Equal {
def isEqual(x: Any): Boolean
def isNotEqual(x: Any): Boolean = !isEqual(x)
}
class Yiibai(xc: Int, yc: Int) extends Equal {
var x: Int = xc
var y: Int = yc
def isEqual(obj: Any) =
obj.isInstanceOf[Yiibai] &&
obj.asInstanceOf[Yiibai].x == x
}
object TraitTest {
def main(args: Array[String]) {
val p1 = new Yiibai(2, 3)
val p2 = new Yiibai(2, 4)
val p3 = new Yiibai(3, 3)
println(p1.isNotEqual(p2))
println(p1.isNotEqual(p3))
println(p1.isNotEqual(2))
println()
println(p1.isEqual(p2))
println(p1.isEqual(p3))
println(p1.isEqual(2))
println()
println(p1.isEqual(p2))
println(p1.isEqual(p3))
println(p1.isEqual(new Yiibai(2,5)))
println()
println(p3.isEqual(new Yiibai(3,5)))
}
}
[root@cdh2 test]# pwd
/user/local/test
[root@cdh2 test]# scala -classpath classes TraitTest
false
true
true
true
false
false
true
false
true
true
[root@cdh2 test]# vim CaseTest.scala
[root@cdh2 test]# scalac -d classes CaseTest.scala
[root@cdh2 test]# scala -classpath classes CaseTest
many
two
one
[root@cdh2 test]# cat CaseTest.scala
object CaseTest {
def main(args: Array[String]) {
println(matchTest(3))
println(matchTest(2))
println(matchTest(1))
}
def matchTest(x: Int): String = x match {
case 1 => "one"
case 2 => "two"
case _ => "many"
}
}
[root@cdh2 test]# vim CaseTest2.scala
[root@cdh2 test]# scalac -d classes CaseTest2.scala
[root@cdh2 test]# scala -classpath classes CaseTest2
Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target: CaseTest2
at scala.sys.package$.error(package.scala:27)
at scala.tools.nsc.GenericRunnerCommand.scala$tools$nsc$GenericRunnerCommand$$guessHowToRun(GenericRunnerCommand.scala:38)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.Option.getOrElse(Option.scala:108)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:17)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:33)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# vim CaseTest2.scala
[root@cdh2 test]# scalac -d classes CaseTest2.scala
[root@cdh2 test]# scala -classpath classes CaseTest2
2
many
one
[root@cdh2 test]# cat CaseTest2.scala
object CaseTest2 {
def main(args: Array[String]) {
println(matchTest("two"))
println(matchTest("test"))
println(matchTest(1))
}
def matchTest(x: Any): Any = x match {
case 1 => "one"
case "two" => 2
case y: Int => "scala.Int"
case _ => "many"
}
}
[root@cdh2 test]# vim CaseTest2.scala
[root@cdh2 test]# scalac -d classes CaseTest2.scala
^[[A[root@cdh2 tesll
total 44
-rw-r--r-- 1 root root 330 Jul 4 19:45 CaseTest2.scala
-rw-r--r-- 1 root root 263 Jul 4 19:38 CaseTest.scala
drwxr-xr-x 2 root root 4096 Jul 4 19:43 classes
-rw-r--r-- 1 root root 104 Jul 4 18:44 HelloWorld2.scala
-rw-r--r-- 1 root root 88 Jul 4 04:18 HelloWorld.scala
-rwxr-xr-x 1 root root 193 Jul 4 04:06 person.sh
-rwxr-xr-x 1 root root 166 Jul 4 04:13 script.sh
-rw-r--r-- 1 root root 769 Jul 4 19:07 Test2.scala
-rw-r--r-- 1 root root 426 Jul 4 19:13 Test3.scala
-rw-r--r-- 1 root root 493 Jul 4 19:00 Test.scala
-rw-r--r-- 1 root root 815 Jul 4 19:31 TraitTest.scala
[root@cdh2 test]# scala -classpath classes CaseTest2
2
many
one
scala.Int
[root@cdh2 test]# cat CaseTest2.scala
object CaseTest2 {
def main(args: Array[String]) {
println(matchTest("two"))
println(matchTest("test"))
println(matchTest(1))
println(matchTest(4))
}
def matchTest(x: Any): Any = x match {
case 1 => "one"
case "two" => 2
case y: Int => "scala.Int"
case _ => "many"
}
}
[root@cdh2 test]#
[root@cdh2 test]# jps
2675 QuorumPeerMain
32348 MainGenericRunner
32504 Jps
[root@cdh2 test]# zkServer.sh status
JMX enabled by default
Using config: /user/local/zookeeper-3.4.6/bin/../conf/zoo.cfg
Mode: standalone
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> val x = List(1,2,3,4)
x: List[Int] = List(1, 2, 3, 4)
scala> x
res0: List[Int] = List(1, 2, 3, 4)
scala> val x = List(1,2,3,4,1,2,3)
x: List[Int] = List(1, 2, 3, 4, 1, 2, 3)
scala> x
res1: List[Int] = List(1, 2, 3, 4, 1, 2, 3)
scala> var x = Set(1,3,5,7,1,3,5,7)
x: scala.collection.immutable.Set[Int] = Set(1, 3, 5, 7)
scala> x
res2: scala.collection.immutable.Set[Int] = Set(1, 3, 5, 7)
scala> var x = Set(1,3,5,7)
x: scala.collection.immutable.Set[Int] = Set(1, 3, 5, 7)
scala> x
res3: scala.collection.immutable.Set[Int] = Set(1, 3, 5, 7)
scala> val x = Map("one" -> 1, "two" -> 2, "three" -> 3)
x: scala.collection.immutable.Map[java.lang.String,Int] = Map(one -> 1, two -> 2, three -> 3)
scala> x
res4: scala.collection.immutable.Map[java.lang.String,Int] = Map(one -> 1, two -> 2, three -> 3)
scala> val x = (10, "Scala")
x: (Int, java.lang.String) = (10,Scala)
scala> x
res5: (Int, java.lang.String) = (10,Scala)
scala> val x:Option[Int] = Some(5)
x: Option[Int] = Some(5)
scala> x
res6: Option[Int] = Some(5)
scala>
[root@cdh2 test]# ll
total 44
-rw-r--r-- 1 root root 330 Jul 4 19:45 CaseTest2.scala
-rw-r--r-- 1 root root 263 Jul 4 19:38 CaseTest.scala
drwxr-xr-x 2 root root 4096 Jul 4 19:43 classes
-rw-r--r-- 1 root root 104 Jul 4 18:44 HelloWorld2.scala
-rw-r--r-- 1 root root 88 Jul 4 04:18 HelloWorld.scala
-rwxr-xr-x 1 root root 193 Jul 4 04:06 person.sh
-rwxr-xr-x 1 root root 166 Jul 4 04:13 script.sh
-rw-r--r-- 1 root root 769 Jul 4 19:07 Test2.scala
-rw-r--r-- 1 root root 426 Jul 4 19:13 Test3.scala
-rw-r--r-- 1 root root 493 Jul 4 19:00 Test.scala
-rw-r--r-- 1 root root 815 Jul 4 19:31 TraitTest.scala
[root@cdh2 test]# vim CaseTest3.scala
[root@cdh2 test]# scalac -d classes CaseTest3.scala
[root@cdh2 test]# scala -classpath classes CaseTest3
()
()
()
()
[root@cdh2 test]# ls -l classes/
total 80
-rw-r--r-- 1 root root 779 Jul 4 19:45 CaseTest2.class
-rw-r--r-- 1 root root 1138 Jul 4 19:45 CaseTest2$.class
-rw-r--r-- 1 root root 762 Jul 4 19:56 CaseTest3.class
-rw-r--r-- 1 root root 1184 Jul 4 19:56 CaseTest3$.class
-rw-r--r-- 1 root root 773 Jul 4 19:42 CaseTest.class
-rw-r--r-- 1 root root 1118 Jul 4 19:42 CaseTest$.class
-rw-r--r-- 1 root root 559 Jul 4 19:31 Equal.class
-rw-r--r-- 1 root root 465 Jul 4 19:31 Equal$class.class
-rw-r--r-- 1 root root 637 Jul 4 04:18 HelloWorld.class
-rw-r--r-- 1 root root 606 Jul 4 04:18 HelloWorld$.class
-rw-r--r-- 1 root root 1967 Jul 4 19:07 Location.class
-rw-r--r-- 1 root root 605 Jul 4 19:07 Test2.class
-rw-r--r-- 1 root root 579 Jul 4 19:07 Test2$.class
-rw-r--r-- 1 root root 605 Jul 4 19:14 Test3.class
-rw-r--r-- 1 root root 1137 Jul 4 19:14 Test3$.class
-rw-r--r-- 1 root root 599 Jul 4 19:04 Test.class
-rw-r--r-- 1 root root 567 Jul 4 19:04 Test$.class
-rw-r--r-- 1 root root 630 Jul 4 19:31 TraitTest.class
-rw-r--r-- 1 root root 1163 Jul 4 19:31 TraitTest$.class
-rw-r--r-- 1 root root 1480 Jul 4 19:31 Yiibai.class
[root@cdh2 test]# scalac -d classes CaseTest3.scala
[root@cdh2 test]# scala -classpath classes CaseTest3
()
()
()
()
[root@cdh2 test]# vim CaseTest3.scala
[root@cdh2 test]# scalac -d classes CaseTest3.scala
CaseTest3.scala:9: error: illegal start of declaration (possible cause: missing `=' in front of current method body)
x match {
^
one error found
[root@cdh2 test]# vim CaseTest3.scala
[root@cdh2 test]# scalac -d classes CaseTest3.scala
[root@cdh2 test]# scala -classpath classes CaseTest3
2
many
one
scala.Int
[root@cdh2 test]# cat CaseTest3.scala
object CaseTest3 {
def main(args: Array[String]) {
println(matchTest("two"))
println(matchTest("test"))
println(matchTest(1))
println(matchTest(5))
}
def matchTest(x: Any):Any={
x match {
case 1 => "one"
case "two" => 2
case y: Int => "scala.Int"
case _ => "many"
}
}
}
[root@cdh2 test]# ok
bash: ok: command not found
[root@cdh2 test]# vim ForTest.scala
[root@cdh2 test]# scalac -d classes/ ForTest.scala
[root@cdh2 test]# scala -classpath classes/ ForTest
Hi Alice! 25
Age: 32 year, name: Bob?
Age: 32 year, name: Charlie?
[root@cdh2 test]# CAT ForTest.scala
bash: CAT: command not found
[root@cdh2 test]# cat ForTest.scala
object ForTest {
def main(args: Array[String]) {
val alice = new Person("Alice", 25)
val bob = new Person("Bob", 32)
val charlie = new Person("Charlie", 32)
for (person <- List(alice, bob, charlie)) {
person match {
case Person("Alice", 25) => println("Hi Alice! 25")
case Person("Bob", 30) => println("Hi Bob! 30")
case Person(name, age) =>
println("Age: " + age + " year, name: " + name + "?")
}
}
}
// case class, empty one.
case class Person(name: String, age: Int)
}
[root@cdh2 test]# vim ForTest.scala
[root@cdh2 test]# scalac -d classes/ ForTest.scala
[root@cdh2 test]# scala -classpath classes/ ForTest
Hi Alice! 25
Hi Bob! 30
Age: 32 year, name: Charlie?
[root@cdh2 test]# cat ForTest.scala
object ForTest {
def main(args: Array[String]) {
val alice = new Person("Alice", 25)
val bob = new Person("Bob", 30)
val charlie = new Person("Charlie", 32)
for (person <- List(alice, bob, charlie)) {
person match {
case Person("Alice", 25) => println("Hi Alice! 25")
case Person("Bob", 30) => println("Hi Bob! 30")
case Person(name, age) =>
println("Age: " + age + " year, name: " + name + "?")
}
}
}
// case class, empty one.
case class Person(name: String, age: Int)
}
[root@cdh2 test]# ok 30
bash: ok: command not found
[root@cdh2 test]# scala -classpath classes/ ForTest
Hi Alice! 25
Hi Bob! 30
Age: 32 year, name: Charlie?
[root@cdh2 test]# cat ForTest.scala
object ForTest {
def main(args: Array[String]) {
val alice = new Person("Alice", 25)
val bob = new Person("Bob", 30)
val charlie = new Person("Charlie", 32)
for (person <- List(alice, bob, charlie)) {
person match {
case Person("Alice", 25) => println("Hi Alice! 25")
case Person("Bob", 30) => println("Hi Bob! 30")
case Person(name, age) =>
println("Age: " + age + " year, name: " + name + "?")
}
}
}
// case class, empty one.
case class Person(name: String, age: Int)
}
[root@cdh2 test]#
[root@cdh2 test]#
[root@cdh2 test]# scalac -d classes/ RegexTest1.scala
[root@cdh2 test]# scala -classpath classes/ RegexTest1
Some(Scala)
[root@cdh2 test]# vim RegexTest2.scala
[root@cdh2 test]# scalac -d classes/ RegexTest2.scala
[root@cdh2 test]# scala -classpath classes/ RegexTest2
Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target: RegexTest2
at scala.sys.package$.error(package.scala:27)
at scala.tools.nsc.GenericRunnerCommand.scala$tools$nsc$GenericRunnerCommand$$guessHowToRun(GenericRunnerCommand.scala:38)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.Option.getOrElse(Option.scala:108)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:17)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:33)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# vim RegexTest2.scala
[9]+ Stopped vim RegexTest2.scala
[root@cdh2 test]# vim RegexTest2.scala
[root@cdh2 test]# scalac -d classes/ RegexTest2.scala
[root@cdh2 test]# scala -classpath classes/ RegexTest2
Scala,scala
[root@cdh2 test]# cat RegexTest2.scala
import scala.util.matching.Regex
object RegexTest2{
def main(args: Array[String]) {
val pattern = new Regex("(S|s)cala")
val str = "Scala is scalable and cool"
println((pattern findAllIn str).mkString(","))
}
}
[root@cdh2 test]# scala -classpath classes/ RegexTest
Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target: RegexTest
at scala.sys.package$.error(package.scala:27)
at scala.tools.nsc.GenericRunnerCommand.scala$tools$nsc$GenericRunnerCommand$$guessHowToRun(GenericRunnerCommand.scala:38)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.Option.getOrElse(Option.scala:108)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:17)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:33)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# scalac -d classes/ RegexTest1.scala
[root@cdh2 test]# scala -classpath classes/ RegexTest1
Some(Scala)
[root@cdh2 test]# cat RegexTest1.scala
import scala.util.matching.Regex
object RegexTest1 {
def main(args: Array[String]) {
val pattern = "Scala".r
val str = "Scala is Scalable and cool"
println(pattern findFirstIn str)
}
}
[root@cdh2 test]#
import scala.util.matching.Regex
object RegexTest1 {
def main(args: Array[String]) {
val pattern = "Scala".r
val str = "Scala is Scalable and cool"
println(pattern findFirstIn str)
}
}
[root@cdh2 test]# scala -classpath classes/ RegexTest1
Some(Scala)
[root@cdh2 test]# vim RegexTest1.scala
[root@cdh2 test]# scalac -d classes/ RegexTest1.scala
[root@cdh2 test]# scala -classpath classes/ RegexTest1
Some(Scala)
non-empty iterator
[root@cdh2 test]# scala -classpath classes/ RegexTest2
Scala,scala
[root@cdh2 test]# scalac -d classes/ RegexTest2.scala
[root@cdh2 test]# scala -classpath classes/ RegexTest2
Scala,scala
[root@cdh2 test]# cat RegexTest2.scala
import scala.util.matching.Regex
object RegexTest2{
def main(args: Array[String]) {
val pattern = new Regex("(S|s)cala")
val str = "Scala is scalable and cool"
println((pattern findAllIn str).mkString(","))
}
}
[root@cdh2 test]# vim RegexTest1.scala
[root@cdh2 test]# scalac -d classes/ RegexTest1.scala
[root@cdh2 test]# scala -classpath classes/ RegexTest1
Some(Scala)
Scala,Scala
[root@cdh2 test]# scala -classpath classes/ RegexTest2
Scala,scala
[root@cdh2 test]# cat RegexTest1.scala
import scala.util.matching.Regex
object RegexTest1 {
def main(args: Array[String]) {
val pattern = "Scala".r
val str = "Scala is Scalable and cool"
println(pattern findFirstIn str)
println((pattern findAllIn str).mkString(","))
}
}
[root@cdh2 test]# cat RegexTest2.scala
import scala.util.matching.Regex
object RegexTest2{
def main(args: Array[String]) {
val pattern = new Regex("(S|s)cala")
val str = "Scala is scalable and cool"
println((pattern findAllIn str).mkString(","))
}
}
[root@cdh2 test]# vim RegexReplace.scala
[root@cdh2 test]# vim RegexReplace.scala
[root@cdh2 test]# scalac -d classes/ RegexReplace.scala
[root@cdh2 test]# scala -classpath classes/ RegexReplace
old str Scala is scalable and cool
Java is scalable and cool
[root@cdh2 test]# cat RegexReplace.scala
object RegexReplace {
def main(args: Array[String]) {
val pattern = "(S|s)cala".r
val str = "Scala is scalable and cool"
println("old str "+str)
println(pattern replaceFirstIn(str, "Java"))
}
}
[root@cdh2 test]# vim RegexD.scala
[root@cdh2 test]# scalac -d classes/ RegexD.scala
[root@cdh2 test]#
[root@cdh2 test]# scala -classpath classes/ RegexD
[root@cdh2 test]# scalac -d classes/ RegexD.scala
[root@cdh2 test]# scala -classpath classes RegexD
[root@cdh2 test]# cat RegexD.scala
import scala.util.matching.Regex
object RegexD{
def main(args: Array[String]) {
val pattern = new Regex("abl[ae]d+")
val str = "ablaw is able1 and cool"
val str1 = "ablaw is able1 and cool abla1 abla0 ablaw "
println((pattern findAllIn str).mkString(","))
println((pattern findAllIn str1).mkString(","))
}
}
[root@cdh2 test]# vim RegexD.scala
[root@cdh2 test]# vim RegexD.scala
[root@cdh2 test]# scalac -d classes/ RegexD.scala
[root@cdh2 test]# scala -classpath classes RegexD
[root@cdh2 test]# scalac -d classes/ RegexReplace.scala
[root@cdh2 test]# scala -classpath classes/ RegexReplace
old str Scala is scalable and cool
Java is scalable and cool
[root@cdh2 test]# scalac -d classes/ RegexD.scala
[root@cdh2 test]# scala -classpath classes/ RegexD
[root@cdh2 test]# vim RegexD.scala
[root@cdh2 test]# scalac -d classes/ RegexD.scala
[root@cdh2 test]# scala -classpath classes/ RegexD
[root@cdh2 test]# vim RegexD1.scala
[root@cdh2 test]# scalac -d classes/ RegexD1.scala
[root@cdh2 test]# scala -classpath classes/ RegexD1
[root@cdh2 test]# vim RegexD1.scala
[root@cdh2 test]# scalac -d classes/ RegexD1.scala
[root@cdh2 test]# scala -classpath classes/ RegexD1
abla,able
[root@cdh2 test]# cat RegexD1.scala
import scala.util.matching.Regex
object RegexD1 {
def main(args: Array[String]) {
val pattern = new Regex("abl[ae]")
val str = "abla is able and cool"
println((pattern findAllIn str).mkString(","))
}
}
[root@cdh2 test]# cp RegexD1.scala RegexD2.scala
[root@cdh2 test]# vim RegexD2.scala
[root@cdh2 test]# scalac -d classes/ RegexD2.scala
[root@cdh2 test]# scala -classpath classes/ RegexD2
[root@cdh2 test]# vim RegexD2.scala
[root@cdh2 test]# scalac -d classes/ RegexD2.scala
[root@cdh2 test]# scala -classpath classes/ RegexD2
[root@cdh2 test]# 正则表达式 没完全搞定
[root@cdh2 test]# ll
total 76
-rw-r--r-- 1 root root 330 Jul 4 19:45 CaseTest2.scala
-rw-r--r-- 1 root root 354 Jul 4 20:07 CaseTest3.scala
-rw-r--r-- 1 root root 263 Jul 4 19:38 CaseTest.scala
drwxr-xr-x 2 root root 4096 Jul 4 22:15 classes
-rw-r--r-- 1 root root 585 Jul 4 20:15 ForTest.scala
-rw-r--r-- 1 root root 104 Jul 4 18:44 HelloWorld2.scala
-rw-r--r-- 1 root root 88 Jul 4 04:18 HelloWorld.scala
-rwxr-xr-x 1 root root 193 Jul 4 04:06 person.sh
-rw-r--r-- 1 root root 234 Jul 4 22:12 RegexD1.scala
-rw-r--r-- 1 root root 250 Jul 4 22:18 RegexD2.scala
-rw-r--r-- 1 root root 349 Jul 4 22:07 RegexD.scala
-rw-r--r-- 1 root root 231 Jul 4 21:54 RegexReplace.scala
-rw-r--r-- 1 root root 270 Jul 4 21:48 RegexTest1.scala
-rw-r--r-- 1 root root 243 Jul 4 20:49 RegexTest2.scala
-rwxr-xr-x 1 root root 166 Jul 4 04:13 script.sh
-rw-r--r-- 1 root root 769 Jul 4 19:07 Test2.scala
-rw-r--r-- 1 root root 426 Jul 4 19:13 Test3.scala
-rw-r--r-- 1 root root 493 Jul 4 19:00 Test.scala
-rw-r--r-- 1 root root 815 Jul 4 19:31 TraitTest.scala
[root@cdh2 test]# vim File.scala
[root@cdh2 test]# scalac -d classes/ F
File.scala ForTest.scala
[root@cdh2 test]# scalac -d classes/ F
File.scala ForTest.scala
[root@cdh2 test]# scalac -d classes/ File.scala
[root@cdh2 test]# scala -classpath classes/ File
Missing file exception
[root@cdh2 test]# cat File.scala
import java.io.FileReader
import java.io.FileNotFoundException
import java.io.IOException
object File {
def main(args: Array[String]) {
try {
val f = new FileReader("input.txt")
} catch {
case ex: FileNotFoundException =>{
println("Missing file exception")
}
case ex: IOException => {
println("IO Exception")
}
}
}
}
[root@cdh2 test]# vim File1.scala
[10]+ Stopped vim File1.scala
[root@cdh2 test]# cp File.scala File1.scala
[root@cdh2 test]# ll
total 84
-rw-r--r-- 1 root root 330 Jul 4 19:45 CaseTest2.scala
-rw-r--r-- 1 root root 354 Jul 4 20:07 CaseTest3.scala
-rw-r--r-- 1 root root 263 Jul 4 19:38 CaseTest.scala
drwxr-xr-x 2 root root 4096 Jul 4 23:33 classes
-rw-r--r-- 1 root root 411 Jul 4 23:35 File1.scala
-rw-r--r-- 1 root root 411 Jul 4 23:32 File.scala
-rw-r--r-- 1 root root 585 Jul 4 20:15 ForTest.scala
-rw-r--r-- 1 root root 104 Jul 4 18:44 HelloWorld2.scala
-rw-r--r-- 1 root root 88 Jul 4 04:18 HelloWorld.scala
-rwxr-xr-x 1 root root 193 Jul 4 04:06 person.sh
-rw-r--r-- 1 root root 234 Jul 4 22:12 RegexD1.scala
-rw-r--r-- 1 root root 250 Jul 4 22:18 RegexD2.scala
-rw-r--r-- 1 root root 349 Jul 4 22:07 RegexD.scala
-rw-r--r-- 1 root root 231 Jul 4 21:54 RegexReplace.scala
-rw-r--r-- 1 root root 270 Jul 4 21:48 RegexTest1.scala
-rw-r--r-- 1 root root 243 Jul 4 20:49 RegexTest2.scala
-rwxr-xr-x 1 root root 166 Jul 4 04:13 script.sh
-rw-r--r-- 1 root root 769 Jul 4 19:07 Test2.scala
-rw-r--r-- 1 root root 426 Jul 4 19:13 Test3.scala
-rw-r--r-- 1 root root 493 Jul 4 19:00 Test.scala
-rw-r--r-- 1 root root 815 Jul 4 19:31 TraitTest.scala
[root@cdh2 test]# vim File1.scala
[root@cdh2 test]# scalac -d classes/ File1.scala
[root@cdh2 test]# scala -classpath classes/ File1
Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target: File1
at scala.sys.package$.error(package.scala:27)
at scala.tools.nsc.GenericRunnerCommand.scala$tools$nsc$GenericRunnerCommand$$guessHowToRun(GenericRunnerCommand.scala:38)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.Option.getOrElse(Option.scala:108)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:17)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:33)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# vim File1.scala
[root@cdh2 test]# scalac -d classes/ File1.scala
[root@cdh2 test]# scala -classpath classes/ File1
Missing file exception
Exiting finally...
[root@cdh2 test]# cat File1.scala
import java.io.FileReader
import java.io.FileNotFoundException
import java.io.IOException
object File1 {
def main(args: Array[String]) {
try {
val f = new FileReader("input.txt")
} catch {
case ex: FileNotFoundException =>{
println("Missing file exception")
}
case ex: IOException => {
println("IO Exception")
}
}
finally {
println("Exiting finally...")
}
}
}
[root@cdh2 test]# cp File1.scala File2.scala
[root@cdh2 test]# vim File2.scala
[root@cdh2 test]# scalac -d classes/ File2.scala
[root@cdh2 test]# scala -classpath classes/ File2
Missing file exception
---Missing file exception--java.io.FileNotFoundException: input.txt (No such file or directory)
Exiting finally...
[root@cdh2 test]# cat File2.scala
import java.io.FileReader
import java.io.FileNotFoundException
import java.io.IOException
object File2 {
def main(args: Array[String]) {
try {
val f = new FileReader("input.txt")
} catch {
case ex: FileNotFoundException =>{
println("Missing file exception")
println("---Missing file exception--"+ex)
}
case ex: IOException => {
println("IO Exception")
}
[root@cdh2 test]# scalac -d classes/ Some.scala
Some.scala:18: error: type mismatch;
found : java.lang.String
required: Option[(String, String)]
Some(parts(0), parts(1))
^
one error found
[root@cdh2 test]# less Some.scala
[root@cdh2 test]# cat Some.scala
object Some {
def main(args: Array[String]) {
println ("Apply method : " + apply("Zara", "gmail.com"));
println ("Unapply method : " + unapply("Zara@gmail.com"));
println ("Unapply method : " + unapply("Zara Ali"));
}
// The injection method (optional)
def apply(user: String, domain: String) = {
user +"@"+ domain
}
// The extraction method (mandatory)
def unapply(str: String): Option[(String, String)] = {
val parts = str split "@"
if (parts.length == 2){
Some(parts(0), parts(1))
}else{
None
}
}
}
[root@cdh2 test]# cp Some.scala
cp: missing destination file operand after `Some.scala'
Try `cp --help' for more information.
[root@cdh2 test]# cp Some.scala Some1.scala
[root@cdh2 test]# vim Some.scala
[root@cdh2 test]# scalac -d classes/ Some.scala
[root@cdh2 test]# scala -classpath classes/ Some
Apply method : Zara@gmail.com
Unapply method : Some((Zara,gmail.com))
Unapply method : None
[root@cdh2 test]# scalac -d classes/ Some.scala
[root@cdh2 test]# scala -classpath classes/ Some
Apply method : Zara@gmail.com
Unapply method : Some((Zara,gmail.com))
Unapply method : None
[root@cdh2 test]# cat Some.scala
object Some {
def main(args: Array[String]) {
println ("Apply method : " + apply("Zara", "gmail.com"));
println ("Unapply method : " + unapply("Zara@gmail.com"));
println ("Unapply method : " + unapply("Zara Ali"));
}
// The injection method (optional)
def apply(user: String, domain: String) = {
user +"@"+ domain
}
// The extraction method (mandatory)
def unapply(str: String): Option[(String, String)] = {
val parts = str split "@"
if (parts.length == 2){
//Some(parts(0), parts(1))
Option(parts(0), parts(1))
}else{
None
}
}
}
[root@cdh2 test]#
[root@cdh2 test]# scala -classpath classes/ Some
Apply method : Zara@gmail.com
Unapply method : Some((Zara,gmail.com))
Unapply method : None
[root@cdh2 test]# vim TestExtractor.scala
[root@cdh2 test]# scalac -d classes/ TestExtractor.scala
[root@cdh2 test]# scala -classpath classes/ TestExtractor
10
10 is bigger two times than 5
[root@cdh2 test]# cat TestExtractor.scala
object TestExtractor {
def main(args: Array[String]) {
val x = TestExtractor(5)
println(x)
x match
{
case TestExtractor(num) => println(x+" is bigger two times than "+num)
//unapply is invoked
case _ => println("i cannot calculate")
}
}
def apply(x: Int) = x*2
def unapply(z: Int): Option[Int] = if (z%2==0) Some(z/2) else None
}
[root@cdh2 test]# 这个怎么运行的没搞定诶
Hello Scala[root@cdh2 test]#
[root@cdh2 test]# cat test.txt
Hello Scala[root@cdh2 test]#
[root@cdh2 test]# cat FileWR.scala
import java.io._
object FileWR{
def main(args: Array[String]) {
val writer = new PrintWriter(new File("test.txt" ))
writer.write("Hello Scala")
writer.close()
}
}
[root@cdh2 test]#
[root@cdh2 test]#
[root@cdh2 test]# vim Console.scala
[root@cdh2 test]# scalac -d classes/ Console.scala
Console.scala:4: error: value readLine is not a member of object Console
val line = Console.readLine
^
one error found
[root@cdh2 test]# vim Console.scala
[root@cdh2 test]# scalac -d classes/ Console.scala
Console.scala:4: error: value readLine is not a member of object Console
val line = Console.readLine()
^
one error found
[root@cdh2 test]# vim Console.scala
[11]+ Stopped vim Console.scala
[root@cdh2 test]# vim Source.scala
[root@cdh2 test]# scalac -d classes/ Source.scala
Source.scala:1: warning: imported `Source' is permanently hidden by definition of object Source
import scala.io.Source
^
Source.scala:7: error: value fromFile is not a member of object Source
Source.fromFile("test.txt" ).foreach{
^
one warning found
one error found
[root@cdh2 test]# scala -version
Scala code runner version 2.9.3 -- Copyright 2002-2011, LAMP/EPFL
[root@cdh2 test]# scalac -d classes/ Console.scala
Console.scala:4: error: value readLine is not a member of object Console
val line = Console.readLine()
^
one error found
[root@cdh2 test]# vim Console.scala
[root@cdh2 test]# mv Console.scala ConsoleTest.scala
[root@cdh2 test]# scalac -d classes/ ConsoleTest.scala
[root@cdh2 test]# scala -classpath classes/ ConsoleTest
Please enter your input : cons test
Thanks, you just typed: cons test
[root@cdh2 test]# scala -classpath classes/ ConsoleTest
Please enter your input : objectName shouldn't the same as Console.API
Thanks, you just typed: objectName shouldn't the same as Console.API
[root@cdh2 test]# cat ConsoleTest.scala
object ConsoleTest{
def main(args: Array[String]) {
print("Please enter your input : " )
val line = Console.readLine()
println("Thanks, you just typed: " + line)
}
}
[root@cdh2 test]# vim Source.scala
[root@cdh2 test]# mv Source.scala SourceTest.scala
[root@cdh2 test]# scalac -d classes/ SourceTest.scala
[root@cdh2 test]# scala -classpath classes/ SourceTest
Following is the content read:
Hello Scala[root@cdh2 test]# ll
total 120
drwxr-xr-x 2 root root 4096 Jul 5 00:58 bak
-rw-r--r-- 1 root root 330 Jul 4 19:45 CaseTest2.scala
-rw-r--r-- 1 root root 354 Jul 4 20:07 CaseTest3.scala
-rw-r--r-- 1 root root 263 Jul 4 19:38 CaseTest.scala
drwxr-xr-x 2 root root 4096 Jul 5 01:56 classes
-rw-r--r-- 1 root root 197 Jul 5 01:51 ConsoleTest.scala
-rw-r--r-- 1 root root 475 Jul 4 23:37 File1.scala
-rw-r--r-- 1 root root 529 Jul 4 23:40 File2.scala
-rw-r--r-- 1 root root 411 Jul 4 23:32 File.scala
-rw-r--r-- 1 root root 189 Jul 5 01:26 FileWR.scala
-rw-r--r-- 1 root root 585 Jul 4 20:15 ForTest.scala
-rw-r--r-- 1 root root 104 Jul 4 18:44 HelloWorld2.scala
-rw-r--r-- 1 root root 88 Jul 4 04:18 HelloWorld.scala
-rwxr-xr-x 1 root root 193 Jul 4 04:06 person.sh
-rw-r--r-- 1 root root 234 Jul 4 22:12 RegexD1.scala
-rw-r--r-- 1 root root 250 Jul 4 22:18 RegexD2.scala
-rw-r--r-- 1 root root 349 Jul 4 22:07 RegexD.scala
-rw-r--r-- 1 root root 231 Jul 4 21:54 RegexReplace.scala
-rw-r--r-- 1 root root 270 Jul 4 21:48 RegexTest1.scala
-rw-r--r-- 1 root root 243 Jul 4 20:49 RegexTest2.scala
-rwxr-xr-x 1 root root 166 Jul 4 04:13 script.sh
-rw-r--r-- 1 root root 602 Jul 5 00:00 Some1.scala
-rw-r--r-- 1 root root 633 Jul 5 00:01 Some.scala
-rw-r--r-- 1 root root 205 Jul 5 01:55 SourceTest.scala
-rw-r--r-- 1 root root 769 Jul 4 19:07 Test2.scala
-rw-r--r-- 1 root root 426 Jul 4 19:13 Test3.scala
-rw-r--r-- 1 root root 408 Jul 5 00:08 TestExtractor.scala
-rw-r--r-- 1 root root 493 Jul 4 19:00 Test.scala
-rw-r--r-- 1 root root 11 Jul 5 01:27 test.txt
-rw-r--r-- 1 root root 815 Jul 4 19:31 TraitTest.scala
[root@cdh2 test]# cat SourceTest.scala
import scala.io.Source
object SourceTest {
def main(args: Array[String]) {
println("Following is the content read:" )
Source.fromFile("test.txt" ).foreach{
}
}
}
[root@cdh2 test]# cat test.txt
Hello Scala[root@cdh2 test]# vim test.txt
[root@cdh2 test]# cat test.txt
Hello Scala
lyc sty scala
[root@cdh2 test]# scala -classpath classes/ SourceTest
Following is the content read:
Hello Scala
lyc sty scala
[root@cdh2 test]# cat SourceTest.scala
import scala.io.Source
object SourceTest {
def main(args: Array[String]) {
println("Following is the content read:" )
Source.fromFile("test.txt" ).foreach{
}
}
}
[root@cdh2 test]# cat ConsoleTest.scala
object ConsoleTest{
def main(args: Array[String]) {
print("Please enter your input : " )
val line = Console.readLine()
println("Thanks, you just typed: " + line)
}
}
[root@cdh2 test]# cp ConsoleTestcala ConsoleTes.scala
cp: cannot stat `ConsoleTestcala': No such file or directory
[root@cdh2 test]# cp ConsoleTest.cala ConsoleTes.scala
cp: cannot stat `ConsoleTest.cala': No such file or directory
[root@cdh2 test]# cp ConsoleTest.scala ConsoleTes.scala
[root@cdh2 test]# vim ConsoleTes.scala
[root@cdh2 test]# scala -classpath classes/ ConsoleTes
Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target: ConsoleTes
at scala.sys.package$.error(package.scala:27)
at scala.tools.nsc.GenericRunnerCommand.scala$tools$nsc$GenericRunnerCommand$$guessHowToRun(GenericRunnerCommand.scala:38)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.Option.getOrElse(Option.scala:108)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:17)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:33)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# scalac -d classes/ ConsoleTes.scala
[root@cdh2 test]# scala -classpath classes/ ConsoleTes
Please enter your input in readLine() : read line minus ()
Thanks, you just typed: read line minus ()
[root@cdh2 test]# cat ConsoleTes.scala
object ConsoleTes{
def main(args: Array[String]) {
print("Please enter your input in readLine() : " )
//val line = Console.readLine()
val line = Console.readLine
println("Thanks, you just typed: " + line)
}
}
[root@cdh2 test]# vim ArrayTest.scala
[root@cdh2 test]# scalac -d classes/ ArrayTest.scala
[root@cdh2 test]# scala -classpath classes/ ArrayTest
1.9
2.9
3.4
3.5
1.9
2.9
3.4
3.5
Total is 11.7
Max is 3.5
[root@cdh2 test]# cat ArrayTest.scala
object ArrayTest {
def main(args: Array[String]) {
var myList = Array(1.9, 2.9, 3.4, 3.5)
// Print all the array elements
for ( x <- myList ) {
println( x )
}
println
myList.foreach{
println
}
// Summing all elements
var total = 0.0;
for ( i <- 0 to (myList.length - 1)) {
total += myList(i);
}
println("Total is " + total);
// Finding the largest element
var max = myList(0);
for ( i <- 1 to (myList.length - 1) ) {
if (myList(i) > max) max = myList(i);
}
println("Max is " + max);
}
}
[root@cdh2 test]# vim Matrix.scala
[root@cdh2 test]# mv Matrix.scala MatrixTest.scala
[root@cdh2 test]# scalac -d classes/ MatrixTest.scala
[root@cdh2 test]# scala -classpath classes/ MatrixTest
0 1 2
0 1 2
0 1 2
[root@cdh2 test]# scala -classpath classes/ MatrixTest
0 1 2
0 1 2
0 1 2
[root@cdh2 test]# cat Matrix.scala
cat: Matrix.scala: No such file or directory
[root@cdh2 test]# cat MatrixTest.scala
import Array._
object MatrixTest {
def main(args: Array[String]) {
var myMatrix = ofDim[Int](3,3)
// build a matrix
for (i <- 0 to 2) {
for ( j <- 0 to 2) {
myMatrix(i)(j) = j;
}
}
// Print two dimensional array
for (i <- 0 to 2) {
for ( j <- 0 to 2) {
print(" " + myMatrix(i)(j));
}
println();
}
}
}
[root@cdh2 test]# vim ConcatArray.scala
[root@cdh2 test]# scalac -d classes/ Con
ConcatArray.scala ConsoleTes.scala ConsoleTest.scala
[root@cdh2 test]# scalac -d classes/ ConcatArray.scala
[root@cdh2 test]# scala -classpath classes/ ConcatArray
1.9
2.9
3.4
3.5
8.9
7.9
0.4
1.5
8
[root@cdh2 test]# cat ConcatArray.scala
import Array._
object ConcatArray {
def main(args: Array[String]) {
var myList1 = Array(1.9, 2.9, 3.4, 3.5)
var myList2 = Array(8.9, 7.9, 0.4, 1.5)
var myList3 = concat( myList1, myList2)
// Print all the array elements
for ( x <- myList3 ) {
println( x )
}
println(myList3.size)
}
}
[root@cdh2 test]# vim RangeArray.scala
[root@cdh2 test]# scalac -d classes/ RangeArray.scala
RangeArray.scala:3: error: not found: value range
var myList1 = range(10, 20, 2)
^
RangeArray.scala:4: error: not found: value range
var myList2 = range(10,20)
^
RangeArray.scala:5: error: not found: value range
var myList3 = range(10, 20, 3)
^
three errors found
[root@cdh2 test]# scalac -d classes/ RangeArray.scala
RangeArray.scala:3: error: not found: value range
var myList1 = range(10, 20, 2)
^
RangeArray.scala:4: error: not found: value range
var myList2 = range(10,20)
^
RangeArray.scala:5: error: not found: value range
var myList3 = range(10, 20, 3)
^
three errors found
[root@cdh2 test]# vim RangeArray.scala
[root@cdh2 test]# scalac -d classes/ RangeArray.scala
[root@cdh2 test]# scalac -classpath classes/ RangeArray
error: source file 'RangeArray' could not be found
one error found
[root@cdh2 test]# ls -l classes/
total 304
-rw-r--r-- 1 root root 1184 Jul 5 02:16 ArrayTest$$anonfun$main$1.class
-rw-r--r-- 1 root root 1325 Jul 5 02:16 ArrayTest$$anonfun$main$2.class
-rw-r--r-- 1 root root 1338 Jul 5 02:16 ArrayTest$$anonfun$main$3.class
-rw-r--r-- 1 root root 899 Jul 5 02:16 ArrayTest$$anonfun$main$4.class
-rw-r--r-- 1 root root 809 Jul 5 02:16 ArrayTest.class
-rw-r--r-- 1 root root 2322 Jul 5 02:16 ArrayTest$.class
-rw-r--r-- 1 root root 779 Jul 4 19:45 CaseTest2.class
-rw-r--r-- 1 root root 1138 Jul 4 19:45 CaseTest2$.class
-rw-r--r-- 1 root root 779 Jul 4 20:07 CaseTest3.class
-rw-r--r-- 1 root root 1138 Jul 4 20:07 CaseTest3$.class
-rw-r--r-- 1 root root 773 Jul 4 19:42 CaseTest.class
-rw-r--r-- 1 root root 1118 Jul 4 19:42 CaseTest$.class
-rw-r--r-- 1 root root 1192 Jul 5 02:27 ConcatArray$$anonfun$main$1.class
-rw-r--r-- 1 root root 707 Jul 5 02:27 ConcatArray.class
-rw-r--r-- 1 root root 1744 Jul 5 02:27 ConcatArray$.class
-rw-r--r-- 1 root root 637 Jul 5 02:03 ConsoleTes.class
-rw-r--r-- 1 root root 1004 Jul 5 02:03 ConsoleTes$.class
-rw-r--r-- 1 root root 643 Jul 5 01:51 ConsoleTest.class
-rw-r--r-- 1 root root 993 Jul 5 01:51 ConsoleTest$.class
-rw-r--r-- 1 root root 559 Jul 4 19:31 Equal.class
-rw-r--r-- 1 root root 465 Jul 4 19:31 Equal$class.class
-rw-r--r-- 1 root root 605 Jul 4 23:38 File1.class
-rw-r--r-- 1 root root 952 Jul 4 23:38 File1$.class
-rw-r--r-- 1 root root 605 Jul 4 23:40 File2.class
-rw-r--r-- 1 root root 1189 Jul 4 23:40 File2$.class
-rw-r--r-- 1 root root 600 Jul 4 23:37 File.class
-rw-r--r-- 1 root root 950 Jul 4 23:37 File$.class
-rw-r--r-- 1 root root 611 Jul 5 01:27 FileWR.class
-rw-r--r-- 1 root root 728 Jul 5 01:27 FileWR$.class
-rw-r--r-- 1 root root 1815 Jul 4 20:15 ForTest$$anonfun$main$1.class
-rw-r--r-- 1 root root 1707 Jul 4 20:15 ForTest.class
-rw-r--r-- 1 root root 1274 Jul 4 20:15 ForTest$.class
-rw-r--r-- 1 root root 2423 Jul 4 20:15 ForTest$Person.class
-rw-r--r-- 1 root root 1562 Jul 4 20:15 ForTest$Person$.class
-rw-r--r-- 1 root root 637 Jul 4 04:18 HelloWorld.class
-rw-r--r-- 1 root root 606 Jul 4 04:18 HelloWorld$.class
-rw-r--r-- 1 root root 1967 Jul 4 19:07 Location.class
-rw-r--r-- 1 root root 1398 Jul 5 02:22 MatrixTest$$anonfun$main$1$$anonfun$apply$mcVI$sp$1.class
-rw-r--r-- 1 root root 1618 Jul 5 02:22 MatrixTest$$anonfun$main$1.class
-rw-r--r-- 1 root root 1755 Jul 5 02:22 MatrixTest$$anonfun$main$2$$anonfun$apply$mcVI$sp$2.class
-rw-r--r-- 1 root root 1648 Jul 5 02:22 MatrixTest$$anonfun$main$2.class
-rw-r--r-- 1 root root 740 Jul 5 02:22 MatrixTest.class
-rw-r--r-- 1 root root 1420 Jul 5 02:22 MatrixTest$.class
-rw-r--r-- 1 root root 1385 Jul 5 03:19 RangeArray$$anonfun$main$1.class
-rw-r--r-- 1 root root 1385 Jul 5 03:19 RangeArray$$anonfun$main$2.class
-rw-r--r-- 1 root root 901 Jul 5 03:19 RangeArray$$anonfun$main$3.class
-rw-r--r-- 1 root root 780 Jul 5 03:19 RangeArray.class
-rw-r--r-- 1 root root 1282 Jul 5 03:19 RangeArray$.class
-rw-r--r-- 1 root root 618 Jul 4 22:12 RegexD1.class
-rw-r--r-- 1 root root 1262 Jul 4 22:12 RegexD1$.class
-rw-r--r-- 1 root root 618 Jul 4 22:18 RegexD2.class
-rw-r--r-- 1 root root 1278 Jul 4 22:18 RegexD2$.class
-rw-r--r-- 1 root root 611 Jul 4 22:07 RegexD.class
-rw-r--r-- 1 root root 1263 Jul 4 22:07 RegexD$.class
-rw-r--r-- 1 root root 649 Jul 4 22:05 RegexReplace.class
-rw-r--r-- 1 root root 1284 Jul 4 22:05 RegexReplace$.class
-rw-r--r-- 1 root root 637 Jul 4 21:48 RegexTest1.class
-rw-r--r-- 1 root root 1324 Jul 4 21:48 RegexTest1$.class
-rw-r--r-- 1 root root 637 Jul 4 21:46 RegexTest2.class
-rw-r--r-- 1 root root 1278 Jul 4 21:46 RegexTest2$.class
-rw-r--r-- 1 root root 1052 Jul 5 00:02 Some.class
-rw-r--r-- 1 root root 1762 Jul 5 00:02 Some$.class
-rw-r--r-- 1 root root 901 Jul 5 01:56 SourceTest$$anonfun$main$1.class
-rw-r--r-- 1 root root 700 Jul 5 01:56 SourceTest.class
-rw-r--r-- 1 root root 1101 Jul 5 01:56 SourceTest$.class
-rw-r--r-- 1 root root 605 Jul 4 19:07 Test2.class
-rw-r--r-- 1 root root 579 Jul 4 19:07 Test2$.class
-rw-r--r-- 1 root root 605 Jul 4 19:14 Test3.class
-rw-r--r-- 1 root root 1137 Jul 4 19:14 Test3$.class
-rw-r--r-- 1 root root 605 Jul 4 20:48 Test.class
-rw-r--r-- 1 root root 1266 Jul 4 20:48 Test$.class
-rw-r--r-- 1 root root 949 Jul 5 00:09 TestExtractor.class
-rw-r--r-- 1 root root 1540 Jul 5 00:09 TestExtractor$.class
-rw-r--r-- 1 root root 630 Jul 4 19:31 TraitTest.class
-rw-r--r-- 1 root root 1163 Jul 4 19:31 TraitTest$.class
-rw-r--r-- 1 root root 1480 Jul 4 19:31 Yiibai.class
[root@cdh2 test]# vim RangeArray.scala
[root@cdh2 test]# scalac -d classes/ RangeArray.scala
[root@cdh2 test]# scala -classpath classes/ RangeArray
10 12 14 16 18
10 11 12 13 14 15 16 17 18 19
10131619[root@cdh2ls -l classes/ngeArray
total 304
-rw-r--r-- 1 root root 1184 Jul 5 02:16 ArrayTest$$anonfun$main$1.class
-rw-r--r-- 1 root root 1325 Jul 5 02:16 ArrayTest$$anonfun$main$2.class
-rw-r--r-- 1 root root 1338 Jul 5 02:16 ArrayTest$$anonfun$main$3.class
-rw-r--r-- 1 root root 899 Jul 5 02:16 ArrayTest$$anonfun$main$4.class
-rw-r--r-- 1 root root 809 Jul 5 02:16 ArrayTest.class
-rw-r--r-- 1 root root 2322 Jul 5 02:16 ArrayTest$.class
-rw-r--r-- 1 root root 779 Jul 4 19:45 CaseTest2.class
-rw-r--r-- 1 root root 1138 Jul 4 19:45 CaseTest2$.class
-rw-r--r-- 1 root root 779 Jul 4 20:07 CaseTest3.class
-rw-r--r-- 1 root root 1138 Jul 4 20:07 CaseTest3$.class
-rw-r--r-- 1 root root 773 Jul 4 19:42 CaseTest.class
-rw-r--r-- 1 root root 1118 Jul 4 19:42 CaseTest$.class
-rw-r--r-- 1 root root 1192 Jul 5 02:27 ConcatArray$$anonfun$main$1.class
-rw-r--r-- 1 root root 707 Jul 5 02:27 ConcatArray.class
-rw-r--r-- 1 root root 1744 Jul 5 02:27 ConcatArray$.class
-rw-r--r-- 1 root root 637 Jul 5 02:03 ConsoleTes.class
-rw-r--r-- 1 root root 1004 Jul 5 02:03 ConsoleTes$.class
-rw-r--r-- 1 root root 643 Jul 5 01:51 ConsoleTest.class
-rw-r--r-- 1 root root 993 Jul 5 01:51 ConsoleTest$.class
-rw-r--r-- 1 root root 559 Jul 4 19:31 Equal.class
-rw-r--r-- 1 root root 465 Jul 4 19:31 Equal$class.class
-rw-r--r-- 1 root root 605 Jul 4 23:38 File1.class
-rw-r--r-- 1 root root 952 Jul 4 23:38 File1$.class
-rw-r--r-- 1 root root 605 Jul 4 23:40 File2.class
-rw-r--r-- 1 root root 1189 Jul 4 23:40 File2$.class
-rw-r--r-- 1 root root 600 Jul 4 23:37 File.class
-rw-r--r-- 1 root root 950 Jul 4 23:37 File$.class
-rw-r--r-- 1 root root 611 Jul 5 01:27 FileWR.class
-rw-r--r-- 1 root root 728 Jul 5 01:27 FileWR$.class
-rw-r--r-- 1 root root 1815 Jul 4 20:15 ForTest$$anonfun$main$1.class
-rw-r--r-- 1 root root 1707 Jul 4 20:15 ForTest.class
-rw-r--r-- 1 root root 1274 Jul 4 20:15 ForTest$.class
-rw-r--r-- 1 root root 2423 Jul 4 20:15 ForTest$Person.class
-rw-r--r-- 1 root root 1562 Jul 4 20:15 ForTest$Person$.class
-rw-r--r-- 1 root root 637 Jul 4 04:18 HelloWorld.class
-rw-r--r-- 1 root root 606 Jul 4 04:18 HelloWorld$.class
-rw-r--r-- 1 root root 1967 Jul 4 19:07 Location.class
-rw-r--r-- 1 root root 1398 Jul 5 02:22 MatrixTest$$anonfun$main$1$$anonfun$apply$mcVI$sp$1.class
-rw-r--r-- 1 root root 1618 Jul 5 02:22 MatrixTest$$anonfun$main$1.class
-rw-r--r-- 1 root root 1755 Jul 5 02:22 MatrixTest$$anonfun$main$2$$anonfun$apply$mcVI$sp$2.class
-rw-r--r-- 1 root root 1648 Jul 5 02:22 MatrixTest$$anonfun$main$2.class
-rw-r--r-- 1 root root 740 Jul 5 02:22 MatrixTest.class
-rw-r--r-- 1 root root 1420 Jul 5 02:22 MatrixTest$.class
-rw-r--r-- 1 root root 1385 Jul 5 03:20 RangeArray$$anonfun$main$1.class
-rw-r--r-- 1 root root 1385 Jul 5 03:20 RangeArray$$anonfun$main$2.class
-rw-r--r-- 1 root root 901 Jul 5 03:20 RangeArray$$anonfun$main$3.class
-rw-r--r-- 1 root root 780 Jul 5 03:20 RangeArray.class
-rw-r--r-- 1 root root 1282 Jul 5 03:20 RangeArray$.class
-rw-r--r-- 1 root root 618 Jul 4 22:12 RegexD1.class
-rw-r--r-- 1 root root 1262 Jul 4 22:12 RegexD1$.class
-rw-r--r-- 1 root root 618 Jul 4 22:18 RegexD2.class
-rw-r--r-- 1 root root 1278 Jul 4 22:18 RegexD2$.class
-rw-r--r-- 1 root root 611 Jul 4 22:07 RegexD.class
-rw-r--r-- 1 root root 1263 Jul 4 22:07 RegexD$.class
-rw-r--r-- 1 root root 649 Jul 4 22:05 RegexReplace.class
-rw-r--r-- 1 root root 1284 Jul 4 22:05 RegexReplace$.class
-rw-r--r-- 1 root root 637 Jul 4 21:48 RegexTest1.class
-rw-r--r-- 1 root root 1324 Jul 4 21:48 RegexTest1$.class
-rw-r--r-- 1 root root 637 Jul 4 21:46 RegexTest2.class
-rw-r--r-- 1 root root 1278 Jul 4 21:46 RegexTest2$.class
-rw-r--r-- 1 root root 1052 Jul 5 00:02 Some.class
-rw-r--r-- 1 root root 1762 Jul 5 00:02 Some$.class
-rw-r--r-- 1 root root 901 Jul 5 01:56 SourceTest$$anonfun$main$1.class
-rw-r--r-- 1 root root 700 Jul 5 01:56 SourceTest.class
-rw-r--r-- 1 root root 1101 Jul 5 01:56 SourceTest$.class
-rw-r--r-- 1 root root 605 Jul 4 19:07 Test2.class
-rw-r--r-- 1 root root 579 Jul 4 19:07 Test2$.class
-rw-r--r-- 1 root root 605 Jul 4 19:14 Test3.class
-rw-r--r-- 1 root root 1137 Jul 4 19:14 Test3$.class
-rw-r--r-- 1 root root 605 Jul 4 20:48 Test.class
-rw-r--r-- 1 root root 1266 Jul 4 20:48 Test$.class
-rw-r--r-- 1 root root 949 Jul 5 00:09 TestExtractor.class
-rw-r--r-- 1 root root 1540 Jul 5 00:09 TestExtractor$.class
-rw-r--r-- 1 root root 630 Jul 4 19:31 TraitTest.class
-rw-r--r-- 1 root root 1163 Jul 4 19:31 TraitTest$.class
-rw-r--r-- 1 root root 1480 Jul 4 19:31 Yiibai.class
[root@cdh2 test]# vim RangeArray.scala
[12]+ Stopped vim RangeArray.scala
[root@cdh2 test]# cat RangeArray.scala
object RangeArray {
def main(args: Array[String]) {
var myList1 = Range(10, 20, 2)
var myList2 = Range(10,20)
var myList3 = Range(10, 20, 3)
// Print all the array elements
for ( x <- myList1 ) {
print( " " + x )
}
println()
for ( x <- myList2 ) {
print( " " + x )
}
println()
myList3.foreach{
}
}
}
[root@cdh2 test]# vim RangeArray.scala
[root@cdh2 test]# scalac -d classes/ RangeArray.scala
[root@cdh2 test]# scala -classpath classes/ RangeArray
10 12 14 16 18
10 11 12 13 14 15 16 17 18 19
10131619[root@cdh2vim RangeArray.scalangeArray
[root@cdh2 test]# scalac -d classes/ RangeArray.scala
[root@cdh2 test]# scala -classpath classes/ RangeArray
10 12 14 16 18
10 11 12 13 14 15 16 17 18 19
10131619
[root@cdh2 test]# 注意Range字母的大小写 objectName 和 保留字 别重复哦
[root@cdh2 test]# vim Str.scala
[root@cdh2 test]# scalac -d classes/ Str.scala
[root@cdh2 test]# scala -classpath classes/Str
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> [root@cdh2 test]#
[root@cdh2 test]# scala -classpath classes/ Str
Hello, world!
[root@cdh2 test]# cat Str.scala
object Str {
val greeting: String = "Hello, world!"
def main(args: Array[String]) {
println( greeting )
}
}
[root@cdh2 test]# vim Str.scala
[root@cdh2 test]# scalac -d classes/ Str.scala
[root@cdh2 test]# scala -classpath classes/ Str
Hello, world!
heheha
String Length is : 17
[root@cdh2 test]# cat Str.scala
object Str {
val greeting: String = "Hello, world!"
val greet="heheha"
def main(args: Array[String]) {
println( greeting )
println( greet )
var palindrome = "Dot saw I was Tod";
var len = palindrome.length();
println( "String Length is : " + len );
}
}
[root@cdh2 test]# vim Str.scala
[root@cdh2 test]# scalac -d classes/ Str.scala
[root@cdh2 test]# scala -classpath classes/ Str
Hello, world!
heheha
String Length is : 17
My name is Zara
Dot Dot saw I was Tod
[root@cdh2 test]# vim FormatTest.scala
[root@cdh2 test]# scalac -d classes/ FormatTest.scala
[root@cdh2 test]# scala -classpath classes/ FormatTest
The value of the float variable is 12.456000, while the value of the integer variable is 2000, and the string is Hello, Scala!()
[root@cdh2 test]#
[root@cdh2 test]# cat FormatTest.scala
object FormatTest {
def main(args: Array[String]) {
var floatVar = 12.456
var intVar = 2000
var stringVar = "Hello, Scala!"
var fs = printf("The value of the float variable is " +
"%f, while the value of the integer " +
"variable is %d, and the string " +
"is %s", floatVar, intVar, stringVar)
println(fs)
}
}
[root@cdh2 test]# 最后一步字符串 为什么 自动填充了 () ??
[root@cdh2 test]# vim Factor.scala
[root@cdh2 test]# cp Factor.scala FactorTest.scala
[root@cdh2 test]# scalac -d classes/ FactorTest.scala
[root@cdh2 test]# scala -classpath classes/ FactorTest
muliplier(1) value = 4
muliplier(2) value = 8
[root@cdh2 test]# cat FactorTest.scala
object FactorTest {
def main(args: Array[String]) {
println( "muliplier(1) value = " + multiplier(1) )
println( "muliplier(2) value = " + multiplier(2) )
}
var factor = 4
val multiplier = (i:Int) => i * factor
}
[root@cdh2 test]# vim Fun.scala
[root@cdh2 test]# vim Fun.scala
[root@cdh2 test]# scalac -d classes/ Fun.scala
[root@cdh2 test]# scala -classpath classes/ Fun
Returned Value : 12
[root@cdh2 test]# cat Fun.scala
object Fun {
def main(args: Array[String]) {
println( "Returned Value : " + addInt(5,7) );
}
def addInt( a:Int, b:Int ) : Int = {
var sum:Int = 0
sum = a + b
return sum
}
/*object Hello{
def printMe( ) : Unit = {
println("Hello, Scala!")
}
}*/
}
object Hello{
def printMe( ) : Unit = {
println("Hello, Scala!")
}
}
[root@cdh2 test]# cp Fun.scala Fun2.scala
[root@cdh2 test]# vim Fun2.scala
[root@cdh2 test]# scalac -d classes/ Fun2.scala
Fun2.scala:4: error: not found: type Hello
new Hello().printMe()
^
one error found
[root@cdh2 test]# vim Fun2.scala
[root@cdh2 test]# scalac -d classes/ Fun2.scala
Fun2.scala:4: error: not found: type Hello
(new Hello).printMe()
^
one error found
[root@cdh2 test]# vim Fun2.scala
[root@cdh2 test]# vim Fun2.scala
[root@cdh2 test]# scalac -d classes/ Fun2.scala
[root@cdh2 test]# scala -classpath classes/ Fun2
Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target: Fun2
at scala.sys.package$.error(package.scala:27)
at scala.tools.nsc.GenericRunnerCommand.scala$tools$nsc$GenericRunnerCommand$$guessHowToRun(GenericRunnerCommand.scala:38)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.Option.getOrElse(Option.scala:108)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:17)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:33)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# vim Fun2.scala
[root@cdh2 test]# scalac -d classes/ Fun2.scala
[root@cdh2 test]# scala -classpath classes/ Fun2
Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target: Fun2
at scala.sys.package$.error(package.scala:27)
at scala.tools.nsc.GenericRunnerCommand.scala$tools$nsc$GenericRunnerCommand$$guessHowToRun(GenericRunnerCommand.scala:38)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.Option.getOrElse(Option.scala:108)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:17)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:33)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# vim Fun2.scala
[root@cdh2 test]# scalac -d classes/ Fun2.scala
[root@cdh2 test]# scala -classpath classes/ Fun2
Returned Value : 12
Hello, Scala!
[root@cdh2 test]#
[root@cdh2 test]# scala -classpath classes/ Fun2
Returned Value : 12
Hello, Scala!
[root@cdh2 test]# cat Fun2.scala
object Fun2 {
def main(args: Array[String]) {
println( "Returned Value : " + addInt(5,7) );
(new Hello).printMe()
}
def addInt( a:Int, b:Int ) : Int = {
var sum:Int = 0
sum = a + b
return sum
}
/*object Hello{
def printMe( ) : Unit = {
println("Hello, Scala!")
}
}*/
}
class Hello{
def printMe( ) : Unit = {
println("Hello, Scala!")
}
}
[root@cdh2 test]# object 调用 外面别的方法，Unit 相当于 void.
[root@cdh2 test]# vim Outer.scala
[root@cdh2 test]# scalac -d classes/ Outer.scala
Outer.scala:8: error: method f in class Inner cannot be accessed in Outer.this.Inner
(new Inner).f() // Error: f is not accessible
^
one error found
[root@cdh2 test]# cat Outer.scala
class Outer {
class Inner {
private def f() { println("f") }
class InnerMost {
f() // OK
}
}
(new Inner).f() // Error: f is not accessible
}
[root@cdh2 test]# vim Outer.scala
[root@cdh2 test]# scalac -d classes/ Outer.scala
Outer.scala:3: error: ';' expected but 'def' found.
public def f() { println("f") }
^
one error found
[root@cdh2 test]# vim Outer.scala
[root@cdh2 test]# scalac -d classes/ Outer.scala
[root@cdh2 test]# cat Outer.scala
class Outer {
class Inner {
def f() { println("f") }
class InnerMost {
f() // OK
}
}
(new Inner).f() // Error: f is not accessible
}
[root@cdh2 test]# vim Outer.scala
[root@cdh2 test]# scalac -d classes/ Outer.scala
Outer.scala:3: error: '=' expected but identifier found.
def public f() { println("f") }
^
Outer.scala:4: error: illegal start of simple expression
class InnerMost {
^
two errors found
[root@cdh2 test]# cat Outer.scala
class Outer {
class Inner {
def public f() { println("f") }
class InnerMost {
f() // OK
}
}
(new Inner).f() // Error: f is not accessible
}
[root@cdh2 test]# vim Outer.scala
[root@cdh2 test]# scalac -d classes/ Outer.scala
[root@cdh2 test]# scala -classpath classes/ Outer
java.lang.NoSuchMethodException: Outer.main([Ljava.lang.String;)
at java.lang.Class.getMethod(Class.java:1665)
at scala.tools.nsc.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:74)
at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101)
at scala.tools.nsc.ObjectRunner$.run(ObjectRunner.scala:33)
at scala.tools.nsc.ObjectRunner$.runAndCatch(ObjectRunner.scala:40)
at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:56)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:80)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# cat Outer.scala
class Outer {
class Inner {
def f() { println("f") }
class InnerMost {
f() // OK
}
}
(new Inner).f() // Error: f is not accessible
}
[root@cdh2 test]# cp Outer.scala Outer1.scala
[root@cdh2 test]# scalac -d classes/ Outer1.scala
[root@cdh2 test]# vim Outer1.scala
[root@cdh2 test]# scalac -d classes/ Outer1.scala
[root@cdh2 test]# scala -classpath classes/ Outer1
Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target: Outer1
at scala.sys.package$.error(package.scala:27)
at scala.tools.nsc.GenericRunnerCommand.scala$tools$nsc$GenericRunnerCommand$$guessHowToRun(GenericRunnerCommand.scala:38)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.Option.getOrElse(Option.scala:108)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:17)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:33)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# vim Outer1.scala
[root@cdh2 test]# scalac -d classes/ Outer1.scala
[root@cdh2 test]# scala -classpath classes/ Outer1
java.lang.NoSuchMethodException: Outer1.main is not static
at scala.tools.nsc.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:76)
at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101)
at scala.tools.nsc.ObjectRunner$.run(ObjectRunner.scala:33)
at scala.tools.nsc.ObjectRunner$.runAndCatch(ObjectRunner.scala:40)
at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:56)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:80)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# vim Outer1.scala
[root@cdh2 test]# scalac -d classes/ Outer1.scala
Outer1.scala:8: error: '=' expected but identifier found.
def static main(args: Array[String]) {
^
Outer1.scala:11: error: illegal start of simple expression
}
^
two errors found
[root@cdh2 test]# cat Outer1.scala
class Outer1 {
class Inner {
def f() { println("f") }
class InnerMost {
f() // OK
}
}
def static main(args: Array[String]) {
(new Inner).f() // Error: f is not accessible
}
}
[root@cdh2 test]# vim Outer1.scala
[root@cdh2 test]# scalac -d classes/ Outer1.scala
[root@cdh2 test]# scala -classpath classes/ Outer1
java.lang.NoSuchMethodException: Outer1.main([Ljava.lang.String;)
at java.lang.Class.getMethod(Class.java:1665)
at scala.tools.nsc.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:74)
at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101)
at scala.tools.nsc.ObjectRunner$.run(ObjectRunner.scala:33)
at scala.tools.nsc.ObjectRunner$.runAndCatch(ObjectRunner.scala:40)
at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:56)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:80)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# class 里面 怎么写 main 函数？？
[root@cdh2 test]# scalac -d classes/ ProtectPub.scala
[root@cdh2 test]# scalac -d classes/ Other.scala
[root@cdh2 test]# scalac -d classes/ Outer1.scala
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
Value of a: 10
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Value of a: 10[root@cdh2 test]#
[root@cdh2 test]# cat WhileTest1.scala
object WhileTest1 {
def main(args: Array[String]) {
var a = 10;
// An infinite loop.
while( true ){
println( "Value of a: " + a );
}
}
}
[root@cdh2 test]# scalac -d classes/ WhileTest.scala
[root@cdh2 test]# scala -classpath classes/ WhileTest
Value of a: 10
Value of a: 11
Value of a: 12
Value of a: 13
Value of a: 14
Value of a: 15
Value of a: 16
Value of a: 17
Value of a: 18
Value of a: 19
[root@cdh2 test]# cat WhileTest.scala
object WhileTest {
def main(args: Array[String]) {
// Local variable declaration:
var a = 10;
// while loop execution
while( a < 20 ){
println( "Value of a: " + a );
a = a + 1;
}
}
}
[root@cdh2 test]# scalac -d classes/ Outer.scala
[root@cdh2 test]# cat Outer.scala
class Outer {
class Inner {
def f() { println("f") }
class InnerMost {
f() // OK
}
}
(new Inner).f() // Error: f is not accessible
}
[root@cdh2 test]# scalac -d classes/ ProtectPub.scala
[root@cdh2 test]# scalac -d classes/ Other.scala
[root@cdh2 test]# scalac -d classes/ Outer1.scala
[root@cdh2 test]# scalac -d classes/ Fun2.scala
[root@cdh2 test]# scalac -d classes/ Fun1.scala
error: source file 'Fun1.scala' could not be found
one error found
[root@cdh2 test]# scalac -d classes/ Fun.scala
[root@cdh2 test]# cat Fun.scala
object Fun {
def main(args: Array[String]) {
println( "Returned Value : " + addInt(5,7) );
}
def addInt( a:Int, b:Int ) : Int = {
var sum:Int = 0
sum = a + b
return sum
}
/*object Hello{
def printMe( ) : Unit = {
println("Hello, Scala!")
}
}*/
}
object Hello{
def printMe( ) : Unit = {
println("Hello, Scala!")
}
}
[root@cdh2 test]# cat Fun1.scala
cat: Fun1.scala: No such file or directory
[root@cdh2 test]# cat Fun2.scala
object Fun2 {
def main(args: Array[String]) {
println( "Returned Value : " + addInt(5,7) );
(new Hello).printMe()
}
def addInt( a:Int, b:Int ) : Int = {
var sum:Int = 0
sum = a + b
return sum
}
/*object Hello{
def printMe( ) : Unit = {
println("Hello, Scala!")
}
}*/
}
class Hello{
def printMe( ) : Unit = {
println("Hello, Scala!")
}
}
[root@cdh2 test]#
[root@cdh2 test]# cat ProtectPub.scala
package society {
package professional {
class Executive {
private[professional] var workDetails = null
private[society] var friends = null
private[this] var secrets = null
def help(another : Executive) {
println(another.workDetails)
//println(another.secrets) //ERROR
}
}
}
}
[root@cdh2 test]# cat Outer1.scala
class Outer1 {
class Inner {
def f() { println("f") }
class InnerMost {
f() // OK
}
}
//def static main(args: Array[String]) {
(new Inner).f() // Error: f is not accessible
//}
}
[root@cdh2 test]# cat Outer2.scala
cat: Outer2.scala: No such file or directory
[root@cdh2 test]# cat Outer.scala
class Outer {
class Inner {
def f() { println("f") }
class InnerMost {
f() // OK
}
}
(new Inner).f() // Error: f is not accessible
}
[root@cdh2 test]# cat Other.scala
package p {
class Super {
def f() { println("f")}
}
class Sub extends Super {
f()
}
class Other {
(new Super).f() // Error: f is not accessible
}
}
[root@cdh2 test]# cat Other1.scala
cat: Other1.scala: No such file or directory
[root@cdh2 test]#
[root@cdh2 test]# vim BreakTest.scala
[root@cdh2 test]# scalac -d classes/ BreakTest.scala
[root@cdh2 test]# scala -classpath classes/ BreakTest
Value of a: 1
Value of a: 2
Value of a: 3
Value of a: 4
After the loop
[root@cdh2 test]# cat BreakTest.scala
import scala.util.control._
object BreakTest {
def main(args: Array[String]) {
var a = 0;
val numList = List(1,2,3,4,5,6,7,8,9,10);
val loop = new Breaks;
loop.breakable {
for( a <- numList){
println( "Value of a: " + a );
if( a == 4 ){
loop.break;
}
}
}
println( "After the loop" );
}
}
[root@cdh2 test]# vim BreakTest1.scala
[root@cdh2 test]# scalac -d classes/ BreakTest1.scala
[root@cdh2 test]# scala -classpath classes/ BreakTest1
Value of a: 1
Value of b: 11
Value of b: 12
Value of a: 2
Value of b: 11
Value of b: 12
Value of a: 3
Value of b: 11
Value of b: 12
Value of a: 4
Value of b: 11
Value of b: 12
Value of a: 5
Value of b: 11
Value of b: 12
[root@cdh2 test]# cat BreakTest1.scala
import scala.util.control._
object BreakTest1 {
def main(args: Array[String]) {
var a = 0;
var b = 0;
val numList1 = List(1,2,3,4,5);
val numList2 = List(11,12,13);
val outer = new Breaks;
val inner = new Breaks;
outer.breakable {
for( a <- numList1){
println( "Value of a: " + a );
inner.breakable {
for( b <- numList2){
println( "Value of b: " + b );
if( b == 12 ){
inner.break;
}
}
} // inner breakable
}
} // outer breakable.
}
}
[root@cdh2 test]# vim DoWhileTest.scala
[root@cdh2 test]# scalac -d classes/ DoWhileTest.scala
[root@cdh2 test]# scala -classpath classes/ DoWhileTest
Value of a: 10
Value of a: 11
Value of a: 12
Value of a: 13
Value of a: 14
Value of a: 15
Value of a: 16
Value of a: 17
Value of a: 18
Value of a: 19
[root@cdh2 test]# cat DoWhileTest.scala
object DoWhileTest {
def main(args: Array[String]) {
// Local variable declaration:
var a = 10;
// do loop execution
do{
println( "Value of a: " + a );
a = a + 1;
}while( a < 20 )
}
}
[root@cdh2 test]# vim IfTest.scala
[root@cdh2 test]# scalac -d classes/ IfTest.scala
[root@cdh2 test]# scala -classpath classes/ IfTest
This is else statement
[root@cdh2 test]# cat IfTest.scala
object IfTest {
def main(args: Array[String]) {
var x = 30;
if( x < 20 ){
println("This is if statement");
}else{
println("This is else statement");
}
}
}
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> A = 0011 1100
<console>:1: error: ';' expected but integer literal found.
A = 0011 1100
^
scala>
scala> B = 0000 1101
<console>:1: error: ';' expected but integer literal found.
B = 0000 1101
^
scala> A = 00111100
<console>:10: error: not found: value A
val $ires0 = A
^
<console>:7: error: not found: value A
A = 00111100
^
scala> var A = 00111100
A: Int = 37440
scala> var B = 00001101
B: Int = 577
scala> A&B
res0: Int = 576
scala> A|B
res1: Int = 37441
scala> A^B
res2: Int = 36865
scala> ~A
res3: Int = -37441
scala> var A = OX00111100
<console>:7: error: not found: value OX00111100
var A = OX00111100
^
scala> var A = Ox00111100
<console>:7: error: not found: value Ox00111100
var A = Ox00111100
^
scala>
scala>
scala>
scala> var myVar = 10;
myVar: Int = 10
scala> val myVal = "Hello, Scala!";
myVal: java.lang.String = Hello, Scala!
scala> val myVal:String = "Hello, Scala!";
myVal: String = Hello, Scala!
scala> var myVar :Int;
<console>:7: error: only classes can have declared but undefined members
(Note that variables need to be initialized to be defined)
var myVar :Int;
^
scala> val myVal :String;
<console>:7: error: only classes can have declared but undefined members
val myVal :String;
^
scala> var myVar:Int;
<console>:7: error: only classes can have declared but undefined members
(Note that variables need to be initialized to be defined)
var myVar:Int;
^
scala> var myVar = 10;
myVar: Int = 10
scala> val myVal = "Hello, Scala!";
myVal: java.lang.String = Hello, Scala!
scala> val (myVar1: Int, myVar2: String) = Pair(40, "Foo");
myVar1: Int = 40
myVar2: String = Foo
scala> val (myVar1, myVar2) = Pair(40, "Foo");
myVar1: Int = 40
myVar2: java.lang.String = Foo
scala> 0xFFFFFFFF
res4: Int = -1
scala> var A=0xFFFFFFFF
A: Int = -1
scala> var A=0x00111100
A: Int = 1118464
scala> 0
res5: Int = 0
scala> 035
res6: Int = 29
scala> 21
res7: Int = 21
scala> 0
res8: Int = 0
scala> 0xFFFFFFFF
res9: Int = -1
scala> 0777L
res10: Long = 511
scala>
scala>
scala> 0.0
res11: Double = 0.0
scala> 1e30f
res12: Float = 1.0E30
scala> 3.14159f
res13: Float = 3.14159
scala> 1.0e100
res14: Double = 1.0E100
scala> .1
<console>:1: error: ';' expected but double literal found.
res14.1
^
scala> .1
<console>:1: error: ';' expected but double literal found.
res14.1
^
scala> 0.1
res15: Double = 0.1
scala> u0041
<console>:8: error: not found: value u0041
u0041
^
scala> 'u0041'
<console>:1: error: unclosed character literal
'u0041'
^
scala> "u0041"
res17: java.lang.String = u0041
scala> "Hello,
<console>:1: error: unclosed string literal
"Hello,
^
scala> World!"
<console>:1: error: unclosed string literal
World!"
^
scala> [root@cdh2 test]#
[root@cdh2 test]# vim Symb.scala
[root@cdh2 test]# scalac -d classes/ S.scala
Some1.scala Some.scala SourceTest.scala Str.scala Symb.scala
[root@cdh2 test]# scalac -d classes/ Symb.scala
[root@cdh2 test]# scala -classpath classes/ Symb
Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target: Symb
at scala.sys.package$.error(package.scala:27)
at scala.tools.nsc.GenericRunnerCommand.scala$tools$nsc$GenericRunnerCommand$$guessHowToRun(GenericRunnerCommand.scala:38)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.Option.getOrElse(Option.scala:108)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:17)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:33)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# cat Symb.scala
package scala
final case class Symbol private (name: String) {
override def toString: String = "'" + name
}
[root@cdh2 test]# vim Hl.scala
[root@cdh2 test]# scalac -d classes/ Hl.scala
Hl.scala:3: error: unclosed string literal
println("Hello World
^
Hl.scala:5: error: unclosed string literal
" );
^
Hl.scala:6: error: ')' expected but '}' found.
}
^
three errors found
[root@cdh2 test]# vim Hl.scala
[root@cdh2 test]# scalac -d classes/ Hl.scala
[root@cdh2 test]# scala -classpath classes/ H
HelloWorld2.scala HelloWorld.scala Hl.scala
[root@cdh2 test]# scala -classpath classes/ Hl
Hello World
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> import scala.collection.immutable.{TreeMap, TreeSet}
import scala.collection.immutable.{TreeMap, TreeSet}
scala> import scala.collection.mutable.HashMap
import scala.collection.mutable.HashMap
scala> import scala.xml._
import scala.xml._
scala> package com.liftcode.stuff
<console>:1: error: illegal start of definition
package com.liftcode.stuff
^
scala> val s = "hello"; println(s)
hello
s: java.lang.String = hello
scala> val s = "hello"
s: java.lang.String = hello
scala> println(s)
hello
scala> println(s);
hello
scala> [root@cdh2 test]#
[root@cdh2 test]# vim HelloWorld.scala
[13]+ Stopped vim HelloWorld.scala
[root@cdh2 test]# vim HelloWorld23.scala
[root@cdh2 test]# scalac -d classes/ HelloWorld2
HelloWorld23.scala HelloWorld2.scala
[root@cdh2 test]# scalac -d classes/ HelloWorld23.scala
[root@cdh2 test]# scala -classpath classes/ HelloWorld23
Hello, world!
[root@cdh2 test]# cat HelloWorld23.scala
object HelloWorld23{
/* This is my first java program.
* This will print 'Hello World' as the output
* This is an example of multi-line comments.
*/
def main(args: Array[String]) {
// Prints Hello World
// This is also an example of single line comment.
println("Hello, world!")
}
}
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> println("Hello, Scala!");
Hello, Scala!
scala> !scala -version
<console>:8: error: object unary_! is not a member of package scala
!scala -version
^
scala> !scala -version
<console>:8: error: object unary_! is not a member of package scala
!scala -version
^
scala> [root@cdh2 test]#
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala>
[root@cdh2 test]# scala -version
Scala code runner version 2.9.3 -- Copyright 2002-2011, LAMP/EPFL
[root@cdh2 test]#
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