实现2个整形变量的交换

实现2个整形变量的交换

        int a = 10;
    int b = 20;
    System.out.println("a:"+a+",b:"+b);

    //方法1:使用第三方变量（开发中常见）
    int c ;
    c = a;
    a = b;
    b = c;
    System.out.println("a:"+a+",b:"+b);

    //使用第2种方式
    a = a + b;
    b = a - b;//b = a + b - b = a
    a = a - b;//a = a + b - a = b

    //方式3:用位异或实现
    //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

    //方式4:一句话搞定
    b = (a+b) - (a=b)
     
    System.out.println("a:"+a+",b:"+b);