如何将经过验证的用户输入传递给方法参数？

Question

我有两门课：MyNumbers和MyScanner。我试图将经过验证的输入传递给calculateSum（int x，int y）方法，以便在MyScanner类中打印最终结果，但我不知道如何从MyScanner类获取用户输入，将它们传递给MyNumbers类中的validate（）方法，以便calculateSum（）方法执行其任务。

P.S.validate（）方法应为void且无参数，但calculateSum（）方法应为string，以字符串形式返回结果并使用两个参数。我还希望validate（）方法提示用户输入并验证值，以确保它们在特定范围内。此方法需要不断提示，直到用户插入有效数字。

如何在不引入另一个变量/实现setters/将变量作为参数传递给validate（）方法的情况下实现这一点？

public class MyNumbers {
    
    int number1;
    int number2;
    
    public void validate() {
    if (number1 >= 10 && number1 <= 50) {
         if(number2 >= 5 && number2 <= 20){
        System.out.println(calculateSum(number1, number2));
       }
    } 
            
    else {
        System.out.println("Number should be between 10 and 50");
    }
  }


public String calculateSum(int x, int y) {
    
    this.number1 = x;
    this.number2 = y;

    validate();

    return "Sum: " + number1 + number2;
  }
 }


public class MyScanner {

public static void main(String[] args) {

MyNumbers myNumbers = new myNumbers();
Scanner scanner = new Scanner(System.in);

int option = scanner.nextInt();

do{
    switch(option){
        case 1:
            System.out.println("Enter number 1");
            int x = scanner.nextInt();
            System.out.println("Enter number 2");
            int y = scanner.nextInt();
            myNumbers.calculateSum(x, y);
            break;
    }
}

while(option!=0);
  }
 }
 

Answer 1

编辑：

import java.util.*; 

class MyNumbers {
    
    int number1;
    int number2;
    
    public void validate() {
         int valid=0;
         int x;
         int y;
         
         Scanner s = new Scanner(System.in);
         System.out.println("Welcome!");
         
         do{
                System.out.println("Enter Number 1: ");
                   
                x = s.nextInt();
                            
                if (x >= 10 && x <= 50) {
                    
                     valid=2;
                
                }
                 else {
                     
                    System.out.println("Number 1 should be between 10 and 50");
                }
                 
         }while(valid!=2);
        
        do {
        
            System.out.println("Enter Number 2: ");
             y = s.nextInt();
            
            if(y >= 5 && y <= 20){
                System.out.println(calculateSum(x, y));
                valid=3;
            }
            
             else {
                System.out.println("Number 2 should be between 5 and 20");
            }
            
        
        }while(valid!=3);
    }


    public String calculateSum(int x, int y) {
        
        this.number1 = x;
        this.number2 = y;
    
        return "Sum: " + (number1 + number2);
    }
}

public class Main {

    public static void main(String[] args) {
    
    MyNumbers myNumbers = new MyNumbers();
    myNumbers.validate();

    }
 }

试试看

import java.util.*; 

class MyNumbers {
    
    int number1;
    int number2;
    
    public void validate(int number1 , int number2) {
        
        if (number1 >= 10 && number1 <= 50) {
             if(number2 >= 5 && number2 <= 20){
            System.out.println(calculateSum(number1, number2));
           }
        } 
                
        else {
            System.out.println("Number should be between 10 and 50");
        }
    }


    public String calculateSum(int x, int y) {
        
        this.number1 = x;
        this.number2 = y;
    
        return "Sum: " + number1 + number2;
    }
}


public class Main {

    public static void main(String[] args) {
    
    MyNumbers myNumbers = new MyNumbers();
    Scanner scanner = new Scanner(System.in);
    
    int option = scanner.nextInt();
    switch(option){
                case 1:
                    System.out.println("Enter number 1");
                    int x = scanner.nextInt();
                    System.out.println("Enter number 2");
                    int y = scanner.nextInt();
                    myNumbers.validate(x, y);
                    myNumbers.calculateSum(x, y);
                    break;
            }
    
  
    }
 }