小技巧--交换两个数

交换两个数的3种方法：
```java
package com.example.demo.core.Test;

/**
 * @author: HanXu
 * on 2022/1/14
 * Class description: 交换两个数
 */
public class SwapNumDemo {
    public static void main(String[] args) {
        int a = 2;
        int b = 5;

swap1(a, b);
        swap2(a, b);
        swap3(a, b);
    }

public static void swap1(int a, int b) {
        //1、异或 交换的原理：a ^ a = 0;  a ^ 0 = a
        //只适用于整数交换
        //x = x; 则 x = x ^ y ^ y
        a = a ^ b;
        b = a ^ b;//b = old a ^ b ^ b = old a
        a = a ^ b;//a = old a ^ old b ^ old a = old b
        System.out.println(a);
        System.out.println(b);
    }

public static void swap2(int a, int b) {
        //2、加减法
        //适用于数值型
        a = a + b;
        b = a - b; // a + b - b = a
        a = a - b;//a + b - a = b
        System.out.println(a);
        System.out.println(b);
    }

public static void swap3(int a, int b) {
        //3、追尾法，因其书写方式特别像追尾
        //适用于所有类型
        int c = a;
        a = b;
        b = c;
        System.out.println(a);
        System.out.println(b);
    }
}
```

小技巧--交换两个数

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