What are the ways to exchange the values ​​of two variables in java?

Method:

1. Define temporary variables

2. No need to define temporary variables

3. Use bit operators

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Code example:

public class SwapTest {
    public static void main(String[] args) {
        int num1 = 10;
        int num2 = 20;

        //方式一：定义临时变量的方式
        //推荐使用方式
        int temp = num1;
        num1 = num2;
        num2 = temp;
        System.out.println("方式一num1:"+num1);
        System.out.println("方式一num2:"+num2);

        //方式二：
        //好处：不用定义临时变量
        //弊端：① 相加操作可能超出存储范围
        //     ② 有局限性：只能适用于数值类型
        num1 = 10;
        num2 = 20;
        num1 = num1 + num2;
        num2 = num1 - num2;
        num1 = num1 - num2;
        System.out.println("方式二num1:"+num1);
        System.out.println("方式二num2:"+num2);

        //方式三：使用位运算符
        //有局限性：只能适用于数值类型
        num1 = 10;
        num2 = 20;
        num1 = num1 ^ num2;
        num2 = num1 ^ num2;
        num1 = num1 ^ num2;
        System.out.println("方式三num1:"+num1);
        System.out.println("方式三num2:"+num2);
    }

}

Running results:

方式一num1:20
方式一num2:10
方式二num1:20
方式二num2:10
方式三num1:20
方式三num2:10

Process finished with exit code 0

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