See around corners - swapping two variables

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This link: https://blog.csdn.net/qq_36249610/article/details/102733166

Value exchange achieved through two classes of variables. Requirements: switching at the arguments.

public class Exchange {
    public double num1;
    public double num2;

    public void exchange(){
        double tmp = num1;
        num1 = num2;
        num2 = tmp;
        System.out.println("num1 = "+num1);
        System.out.println("num2 = "+num2);
    }
}

import java.util.Scanner;
public class Test {
    public static void main(String[] args) {
        Exchange exchange = new Exchange();
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要交换的两个数:");
        exchange.num1 = scanner.nextDouble();
        exchange.num2 = scanner.nextDouble();
        exchange.exchange();
    }
   
}