在本教程中，我们将看到如何在不使用临时变量的情况下交换两个数字。

有三种方法可以做到这一点。

Java程序：

package org.igi.theitroad;
class SwapingTwoNumbers {
 
    public static void main(String args[]){
        int a = 5;
        int b = 10;
 
        //First way
        System.out.println("First way");
        System.out.println("Before swap:");
        System.out.println("a value: "+a);
        System.out.println("b value: "+b);
 
        a = a+b;
        b = a-b;
        a = a-b;
        System.out.println("After swap:");
        System.out.println("a value: "+a);
        System.out.println("b value: "+b);
 
 //Second way 
 System.out.println("");
        System.out.println("Second way");
        System.out.println("Before swap:");
        System.out.println("a value: "+a);
        System.out.println("b value: "+b);
 
        a = a*b;
        b = a/b;
        a = a/b;
        
        System.out.println("After swap:");
        System.out.println("a value: "+a);
        System.out.println("b value: "+b);
 
        //Third way
 System.out.println("");
        System.out.println("Third way");
        System.out.println("Before swap:");
        System.out.println("a value: "+a);
        System.out.println("b value: "+b);
 
        a = a^b;
        b = a^b;
        a = a^b;
        System.out.println("After swap:");
        System.out.println("a value: "+a);
        System.out.println("b value: "+b);    }
}

运行上面的程序时，我们将获取以下输出：

First way
Before swap:
a value: 5
b value: 10
 
After swap:
a value: 10
b value: 5
 

 
Second way
Before swap:
a value: 10
b value: 5
 
After swap:
a value: 5
b value: 10
 

 
Third way
Before swap:
a value: 5
b value: 10
 
After swap:
a value: 10
b value: 5

第三种方式是最快的。