不创建第三个变量的情况下交换两个变量的值

int a = 500, b = 600;
// 方法一
a = a + b;
b = a - b;
a = a - b;
System.out.println(a);
System.out.println(b);
// 方法二
a = a ^ b;
b = a ^ b;
a = a ^ b;
System.out.println(a);
System.out.println(b);