[置顶] 【scala 代码片段1】轻松入门scala--列表的操作以及文件读取

/**
* Created by Administrator on 2016/5/5.
*/
object test1 {

def main(args: Array[String]) {
val data1=1 to 10
//   让列表中的每个元素都乘以2
val data2=data1.map(_*2)
data2.foreach(println)
//求列表中的所有元素之和
//      方法1::
val data3=data1.reduceLeft(_+_)
println(data3)

//      方法2::
val data4=data1.sum
println(data4)
// 读取txt文件
//      方法1::
val fileText = io.Source.fromFile("E:\\关系圈\\relation.txt").mkString
fileText.foreach(print)

//      方法2::
val fileLines = io.Source.fromFile("E:\\关系圈\\relation.txt").getLines.toList
fileLines.foreach(println)
//    过滤列表中的数值
val (passed, failed) = List(49, 58, 76, 82, 88, 90) partition ( _ > 60 )
println(passed)
println(failed)
//求列表中最大的值，最小的值
val data_max=passed.max
val data_min=failed.min
println("最大值："+data_max)
println("最小值："+data_min)
//列表连接
def testList() {
var oneTwoThree = List(1, 2, 3)
var fourFive = List(4, 5)

println(oneTwoThree ::: fourFive)
println(oneTwoThree)
println(fourFive)
}

testList()
}
}

2
4
6
8
10
12
14
16
18
20
55
55
phone   phone_num
13054939110 15269919367
13054939110 15092901717
13054939110 15020384964
18669630069 15269919367
18669630069 15588170772
18669630069 18669630089
18669630089 15725966397
18669630089 15168988052
18669630089 15553934051
phone   phone_num
13054939110 15269919367
13054939110 15092901717
13054939110 15020384964
18669630069 15269919367
18669630069 15588170772
18669630069 18669630089
18669630089 15725966397
18669630089 15168988052
18669630089 15553934051
List(76, 82, 88, 90)
List(49, 58)
最大值：90
最小值：49
List(1, 2, 3, 4, 5)
List(1, 2, 3)
List(4, 5)

Process finished with exit code 0