Question

不确定为什么代码不能正常工作似乎很好D：

所以这段代码是一个猜谜游戏，因为你可以看到它实现了swing并且出于某种原因它只是不会在eclipse上编译

public class GuessingGame     {
        public static void main(String[] args) 
    {
        int randomNumber;
         randomNumber = (int) (10 * Math.random()) + 1;           
         Scanner keyboard = new Scanner(System.in);
         int guess=0;
         int attempts = 0;

         GuessingGameGUI game = new GuessingGameGUI( );
         game.setVisible(true);

         while (guess != randomNumber)
        {
             try
             {
                 System.out.print("Guess the number from 1-10: ");
                 attempts++;
                 guess = keyboard.nextInt();

                if (guess < 1 || guess > 10)
                    throw new BadGuessException(); 


             }

         catch (BadGuessException e)
         {
            System.out.println(e.getMessage());
         }

         catch (InputMismatchException e)
         {
             keyboard.next();
             System.out.println("Sorry, you entered an invalid number format. ");   
             }    
        }

     System.out.println("\nYOU GOT IT! (It took " + attempts + " attempt(s))");
    }
}

          public class GuessingGameGUI extends JFrame 
     {
    public static final int WIDTH = 500;
    public static final int HEIGHT = 250;

    public GuessingGameGUI()
    { 
        super();
        setTitle("Guessing Game");
        setSize(WIDTH, HEIGHT);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new BorderLayout());

        JPanel north= new JPanel();
        add(north, BorderLayout.NORTH);
        JLabel lab1 = new JLabel("Guess a number between 1 and 10?");

        JPanel center = new JPanel();
        add(center, BorderLayout.CENTER);
        JTextField userInput = new JTextField();
        JButton Guess = new JButton("Guess");   

    Guess.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            JPanel south = new JPanel();
            add(south, BorderLayout.SOUTH);
            JLabel lab2 = new JLabel();
            south.add(lab2);

            int guess = 0;
            int randomNumber=(int) (10 * Math.random()) + 1;
            int attempts = 0;
            attempts++;


            if (e.getActionCommand().equals("Guess"))
            {
                if (guess < 1 || guess > 10)
                {
                    lab2.setText("Invalid number");
                    getContentPane().setBackground(Color.red);
                }
                else if (guess == randomNumber)
                {
                    lab2.setText("\nYOU GOT IT! (It took " + attempts + "

          attempt(s))");
                }
                else
                {
                    getContentPane().setBackground(Color.GRAY);
                    lab2.setText("Sorry, try again");
                }
            }

        }
    });
       //NORTH PANEL
      north.add(lab1);

       //CENTER PANEL
       userInput.setPreferredSize( new Dimension( 200, 25 ) );
       setLayout(new FlowLayout());
       center.add(userInput);
       center.add(Guess);
       Container pane = this.getContentPane();
       }
       }

Answer 1

关于，

 /tmp/java_966Ca2/GuessingGame.java:7: 
  error: cannot find symbol 
  Scanner keyboard = new Scanner(System.in); 
  ^ symbol: class Scanner location: class GuessingGame 

 /tmp/java_966Ca2/GuessingGame.java:7: 
  error: cannot find symbol 
  Scanner keyboard = new Scanner(System.in);

编译器告诉您它无法找到类别，例如Scanner类，因为您还没有导入它们。你必须有像

这样的陈述

import java.util.Scanner;

使用此类和其他类。

你有一个方法块，你既可以投掷也可以捕获BadGuessException，这在这种情况下确实没有意义。您需要通过说明和/或与老师讨论来澄清您需要在该代码块中执行的操作，但您当前正在做的事情（除了不创建BadGuessException类之外）是错误的。

Answer 2

看起来你错过了BadGuessException。

如果这是学校作业，您可能需要这样的课程：

class BadGuessException extends Exception
{

}

Java GUI猜谜游戏

2 个答案: