Java中不用第三个变量来互换两个变量的值

class Swap{
    public static void main(String[] args){
        int a = 3;
        int b = 5;

        int c; 
        c = a; //把a的值先存到c
        a = b; //把b存给a
        b = c; //把存在c的值倒赋给b

        System.out.println("a="+a); //a==5
        System.out.println("b="+b); //b==3
    }
}

import java.util.Scanner;
class VariableExchange{
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);          //创建扫描器
        System.out.println("请输入变量a的值");
        long a = scan.nextLong();                       //接收第1个变量值
        System.out.println("请输入变量b的值");
        long b = scan.nextLong();                       //接收第2个变量值
        System.out.println("a=" + a + "\tb=" + b );
        System.out.println("执行变量互换...");
        a = a + b; 
		b = a - b;
		a = a - b;
        System.out.println("a=" + a + "\tb=" + b );
    }
}

import java.util.Scanner;
class VariableExchange{
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);          //创建扫描器
        System.out.println("请输入变量a的值");
        long a = scan.nextLong();                       //接收第1个变量值
        System.out.println("请输入变量b的值");
        long b = scan.nextLong();                       //接收第2个变量值
        System.out.println("a=" + a + "\tb=" + b );
        System.out.println("执行变量互换...");
        a = a ^ b;                                      //执行变量互换
        b = b ^ a;                                      //执行变量互换
        a = a ^ b;                                      //执行变量互换
        System.out.println("a=" + a + "\tb=" + b );
    }
}