class OperatorTest {

     public static void main(String[] args) {

         int a = 10;

         int b = 20;

         System.out.println("a:"+a+",b:"+b);

         //方式1：使用第三方变量(开发中常用的)

         /*

         int c = a;

         a = b;

         b = c;

         System.out.println("a:"+a+",b:"+b);

         System.out.println("------------");

         */

         //方式2：用位异或实现(面试常有用)

         //左边：a,b,a

         //右边：a ^ b

         /*

         a = a ^ b;

         b = a ^ b; //a ^ b ^ b = a

         a = a ^ b; //a ^ b ^ a = b

         System.out.println("a:"+a+",b:"+b);

         */

         //方式3：用变量相加的做法  ：有局限 a+b超出int的范围就不行了

         /*

         a = a + b; //a=30

         b = a - b; //b=a+b-b=10

         a = a - b; //a=a+b-a=20

         System.out.println("a:"+a+",b:"+b);

         */

         //方式4：一句话搞定

         b = (a+b) - (a=b); //b=30-20=10,a=20

         System.out.println("a:"+a+",b:"+b);

     }

 }