java - 使用随机整数询问乘法表

Question

我编写了以下代码，询问“num1 乘以 num2 是多少？”这个问题。但是，当我尝试运行 java 文件时，我没有得到任何响应。你能帮助我理解我做错了什么吗？代码如下:

import java.util.Scanner;
import java.util.Random;

public class MultiplyLearn{

    public void Learn(){

        Random multiple = new Random();
        Scanner input = new Scanner( System.in );
        boolean wrong = true;

        int num1 = 1 + multiple.nextInt( 9 );
        int num2 = 1 + multiple.nextInt( 9 );

        while( wrong == true ){

        askQuestion( num1, num2 );
        int answer = input.nextInt();

        if( answer == num1*num2 ){
            System.out.println( "Very Good" );
            wrong = false;
        }

        else{
            System.out.print( "No. Please try again." );
        }
        }
    }

    public String askQuestion( int x, int y ){

        return "How much is" + x + "times" + y + "?";
    }
}

Answer 1

向类中添加一个 main 方法

import java.util.Scanner;
import java.util.Random;

public class MultiplyLearn{

   //your actual code goes here

   public static void main(String args[]) throws Exception{
       new MultiplyLearn().Learn();
   }
}

所以你的最后一个类将如下所示

import java.util.Scanner;
import java.util.Random;

public class MultiplyLearn{

    public void Learn(){

        Random multiple = new Random();
        Scanner input = new Scanner( System.in );
        boolean wrong = true;

        int num1 = 1 + multiple.nextInt( 9 );
        int num2 = 1 + multiple.nextInt( 9 );

        while( wrong == true ){

        askQuestion( num1, num2 );
        int answer = input.nextInt();

        if( answer == num1*num2 ){
            System.out.println( "Very Good" );
            wrong = false;
        }

        else{
            System.out.print( "No. Please try again." );
        }
        }
    }

    public String askQuestion( int x, int y ){

        return "How much is" + x + "times" + y + "?";
    }

    public static void main(String args[]) throws Exception{
       new MultiplyLearn().Learn();
    }
}