实现两个整数变量的互换

 

1.需要添加第三方变量(开发中常用):

class Hello2 {
    public static void main(String[] args) {
             int x = 10;
             int y = 5;
             int temp;
             temp = x ;
             x = y;
             y = temp;
             System.out.println("x = " + x + ",y = " + y); 
    }

}

 

结果:

2.不需要第三方变量(1)(有弊端,有可能超过int的取值范围):

class Hello2 {
    public static void main(String[] args) {
             int x = 10;
             int y = 5;
             x = x + y;
             y = x - y;
             x = x - y;
             System.out.println("x = " + x + ",y = " + y); 
    }

}

结果:

  不需要第三方变量(2)(用^来做):

class Hello2 {
    public static void main(String[] args) {
             int x = 10;
             int y = 5;
             x = x ^ y;
             y = x ^ y;
             x = x ^ y;
             System.out.println("x = " + x + ",y = " + y); 
    }

}

结果: