从另一个类调用方法时出现java问题

Question

如果我在main中添加三个扫描器，我的程序只能“正确”运行，但是如果我删除它们，我会得到“无法解析符号fnum、snum和total”错误。如何从CalculatorClass，从main调用此方法

package com.company;
import java.util.Scanner;
public class Main {

    public static void main(String[] args) {



    Scanner nameInput = new Scanner(System.in);
    NameInputClass nameInputClassObject = new NameInputClass();
    System.out.println("Hello! Please enter your name");
    String name = nameInput.nextLine();
    nameInputClassObject.nameInput(name);

    Scanner input1 = new Scanner(System.in);
    int fnum = input1.nextInt();
    Scanner input2 = new Scanner(System.in);
    int snum = input1.nextInt();
    Scanner input3 = new Scanner(System.in);
    int total = input1.nextInt();
    CalculatorClass calculatorClassObject = new CalculatorClass();
    calculatorClassObject.calcInput(snum,fnum,total);


public class NameInputClass {
public static void nameInput(String name){
System.out.println("Hello "+name);}}


import java.util.Scanner;
public class CalculatorClass {
public static void calcInput(int fnum, int snum, int total){
    System.out.println("Give first number");
    Scanner firstNumber = new Scanner(System.in);
     fnum = firstNumber.nextInt();
    System.out.println("Give second number");
    Scanner secondNumber = new Scanner(System.in);
     snum = firstNumber.nextInt();
    total = fnum + snum;
    System.out.println("your total = " +total);

   }
 }  

Answer 1

你可以创建一个你的主对象Main main = new Main();

但我建议你应该把所有的对象和功能正确地分开。创建类和对象的正确方法

那就把这一切都记在你的主目录里