Four methods to achieve the interchange between two integer variables

Four methods to achieve the interchange between two integer variables

Method one (using third-party variables (used in development))

class Test {
    
    
    public static void main(String[] args) {
    
    
        int a = 10;
        int b = 20;

        System.out.println("a:"+a+",b:"+b);

        //方式1：使用第三方变量(开发中用的)
      
        int c = a;
        a = b;
        b = c;
        System.out.println("a:"+a+",b:"+b);
    }
}

Method 2 (Exclusive OR by bit (for interview))

class Test {
    
    
    public static void main(String[] args) {
    
    
        int a = 10;
        int b = 20;

        System.out.println("a:"+a+",b:"+b);

        //方式2：用位异或实现(面试用)
        //左边：a,b,a
        //右边：a ^ b
      
        a = a ^ b;
        b = a ^ b; //a ^ b ^ b = a
        a = a ^ b; //a ^ b ^ a = b
        System.out.println("a:"+a+",b:"+b);
    }
}

Method three (using the method of adding variables)

class Test {
    
    
    public static void main(String[] args) {
    
    
        int a = 10;
        int b = 20;

        System.out.println("a:"+a+",b:"+b);

        //方式3：用变量相加的做法
      
        a = a + b; //a=30
        b = a - b; //b=10
        a = a - b; //a=20
        System.out.println("a:"+a+",b:"+b);
    }
}

Method Four

class Test {
    
    
    public static void main(String[] args) {
    
    
        int a = 10;
        int b = 20;

        System.out.println("a:"+a+",b:"+b);

        //方式4：一句话搞定
        b = (a+b) - (a=b); //b=30-20=10,a=20
        System.out.println("a:"+a+",b:"+b);
    }
}