java - 我如何将 x 和 y 从不同的类返回到 Java 中的 main？

Question

如何将我的 x 和 y 变量返回到 main 中以执行加法？在此先感谢您的帮助!

import java.util.Scanner;

public class calling {

    public static int x;
    public static int y;

    public static void num1() {
        Scanner scanner = new Scanner (System.in);
        System.out.println("Please enter a number: ");
        x=scanner.nextInt();    
    }

    public static void num2() {
        Scanner scanner = new Scanner (System.in);
        System.out.println("Please enter a second number: ");
        y=scanner.nextInt();    
    }

    public static void main(String[] args){     **//place to return variables.**

        num1();
        num2();
        System.out.print("The sum of the two numbers is: " + (x+y));
    }
}

Answer 1

public static int getInput() {
    Scanner scanner = new Scanner(System.in);
    return scanner.nextInt();
}

public static void main(String[] args){     
    System.out.println("Please enter a number: ");
    int x = getInput();   

    System.out.println("Please enter a second number: ");
    int y = getInput();

    int sum = x + y;
    System.out.print("The sum of the two numbers is: " + sum);
}

或者更面向对象(面向对象)的方法可能看起来像

public class Calculator {

private Scanner scanner;

public Calculator() {
    scanner = new Scanner (System.in);
}

public int getInput() {
    return scanner.nextInt();
}

public int add(int x, int y) {
    return x + y;
}

public static void main(String[] args) {     
    Calculator calculator = new Calculator();

    System.out.println("Please enter a number: ");
    int x = calculator.getInput();   

    System.out.println("Please enter a second number: ");
    int y = calculator.getInput();

    int sum = calculator.add(x, y);
    System.out.print("The sum of the two numbers is: " + sum);
}

请注意 Java naming conventions状态类的首字母应大写。