不定义中间变量的情况下，实现两个数交换数值

public class ChangeTwoNumber{
public static void main(String[] args){
changeTwoNumber(1,2);
}

/**
* 交换两个int数的值
*/
static void changeTwoNumber(int a, int b){
System.out.println("what user input is: a = " + a + ", b = " + b);
a = a ^ b;
b = a ^ b;
a = a ^ b;
System.out.println("what the program output is: a = " + a + ", b = " + b);
}
}