题解 | #交换变量值#

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int a = scanner.nextInt();
        int b = scanner.nextInt();
        //方法一：运算
        // a = a + b; 
        // b = a - b; 
        // a = a - b;
        // System.out.println(a+" "+b);

        //方法二：使用数组
        int[] array=new int[2];
        array[0]=a;
        array[1]=b;
        System.out.println(b+" "+a);

        //方法三：使用第三变量


    }
}