不使用中间变量来交换两个变量的值

1. 使用加减法

 

int x = 3;
int y = 5;
x = x ^ y;
y = x ^ y;
x = x ^ y;

 

 

2. 使用异或

 

int x = 3;
int y = 5;
x = x + y;
y = x - y;
x = x - y;

 

 

3. 只要在int范围内都没有问题

 

int x = Integer.MAX_VALUE;
int y = Integer.MAX_VALUE - 15;
x = x + y;
y = x - y;
x = x - y;