java学习第三天

今天过的很快，今天学习的知识很多，但是但觉自好像还是消化不了~~好了，话不多说，还是上题

3、输入一个数判断它是不是偶数？

*/

import java.util.Scanner;

public class Pdos{

public static void main(String[] args){

Scanner s = new Scanner(System.in);

System.out.println("请输入一个数，判断他是不是偶数");

int a = s.nextInt();

if (a%2==0) {

System.out.println("是偶数");

}else {

System.out.println("不是偶数");

}

}

}

输入分数 查询段位

*/

import java.util.Scanner;

public class Cx{

public static void main(String[] args){

Scanner s = new Scanner(System.in);

System.out.println("输入分数，查询段位");

int a = s.nextInt();

int a1 = 1200;

int h = 1450;

int bj =1700;

if (a1<1200) {

System.out.println("英勇黄铜");

}if (a>=1200&&a<1450) {

System.out.println("不屈白银");

}if (a>=1450&&a<1700) {

System.out.println("荣耀黄金");

}if (a>=1700&&a<2000) {

System.out.println("华贵铂金");

}if (a>=2000) {

System.out.println("璀璨钻石");

}

}

}

控制台输入 2016/3/30 17:41:45

*/

import java.util.Scanner;

public class Kz{

public static void main(String[] args){

Scanner s = new Scanner(System.in);

System.out.println("输入用户名");

String b = s.next();

String a1 ="admin";

String a2 = "sun123";

if (b==a1) {

System.out.println("输入正确，请输入密码");

}

}

}

public class Cxlckz{

public static void main(String[] args){

System.out.println(111111);

System.out.println(111);

System.out.println(11111111);

boolean che = false ;

boolean jia = true;

int money = 10000;

int heiht = 170;

String cxy = "程序员";

if (che&&jia&&money>10000&&heiht>170||cxy.equals("程序员")) {

System.out.println("牵手成功");

}

}

}

三目运算符 2016/3/30 16:24:36

*/

public class Smys{

public static void main(String[] args){

int a = 10;

boolean G = a==0?false:true;

System.out.println(G);

int money = 10;

String food =money>8?"炒饭":"小面";

System.out.println("吃:"+food);

int b = 20;

String b1 = b<10?"今天晚饭吃嘎嘎":"今天晚饭吃稀饭";

System.out.println(b1);

}

}

关系运算符 2016/3/30 14:18:55

*/

public class Gxys{

public static void main(String[] args){

int a = 20;

int b = 4;

System.out.println(a<b);

int a1 = 20;

System.out.println(a1<=20&&a1>=30);

System.out.println(a1!=20);

System.out.println(a1==a);

String b2 = "乖乖狗狗";

System.out.println(b2!="乖乖狗狗");

System.out.println(a<<1);//位移运算符<<乘以2

System.out.println(a>>1);//位移运算符>>除以2

}

}

逻辑运算符2016/3/30 11:45:59

*/

public class Ljys{

public static void main(String[] args){

boolean a = true;

boolean b = false;

System.out.println(a||b);

System.out.println(a&&b);

System.out.println(!a);

}

}

逻辑符加字符串

*/

public class Ljf{

public static void main(String[] args){

int a = 10;

int b = 10;

System.out.println(a+b);

String c = "年龄";

System.out.println(c+a+b);

System.out.println(c+(a+b));

System.out.println("小伙子"+c+(a+b)+"已经到了结婚年龄");

}

}

加加减减运算符

*/

public class Jj{

public static void main(String[] args){

int a = 10;

int b = a+++a+++a++;

System.out.println(b);

int c1 = 13;

int c2 = 14;

int c3 = c1+++c2---c1;

System.out.println(c3);

}

}

又坚持了一天，今天讲的太多感觉记不住。。。。。