变量值a交换b，b交换a....

package day01;  

public class Test1 {
    public static void main(String[] args) {
        //不利用其它变量时期A和B的值交换
        Integer A=1;
        Integer B=2;  

        //
        fun1(A, B);  

        //异或
        fun3(A, B);
    }
    public static void fun1(Integer a,Integer b){
        a=a+b;
        b=a-b;
        a=a-b;
        System.out.println("A="+a+",B="+b);
    }
    //异或实现两个数据交换
    public static void fun3(Integer A,Integer B){
        A=A^B;
        B=A^B;//A^B^B=A
        A=A^B;//A^B^A=B
        Syst