按下JButton時重置游戲的ActionListener

Question

嗨，我正在嘗試使用此ActionListener和方法重置游戲：

          newGame.addActionListener(new ActionListener()
      {
      public void actionPerformed(ActionEvent e)
      {
          reset();
      }
    });
  }

  private void reset() {
      for(byte row=0; row<8; row++)
    {
      for(byte col=0; col<8; col++)
      {
        ImageIcon randomValue = icons[(byte)(Math.random() * icons.length)];
        shinyButtons[row][col] = new JButton(randomValue);
        shinyButtons[row][col].setLocation(10+col*69, 10+row*69);
        shinyButtons[row][col].setSize(69,69);
        getContentPane().add(shinyButtons[row][col]);
      }
    }
  }

但是，每當我按下按鈕時，都不會發生任何事情，對我如何真正重置它的任何幫助都會很棒！

如果需要，這是我的完整代碼：

import javax.swing.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.*;

public class ShinyButtonsApp extends JFrame implements ActionListener
{
  private static byte ROWS =8;
  ShinyButtons shiny = new ShinyButtons();


  public ImageIcon[] icons =
  {
    new ImageIcon("RedButton.png"),
    new ImageIcon("OrangeButton.png"),
    new ImageIcon("YellowButton.png"),
    new ImageIcon("GreenButton.png"),
    new ImageIcon("BlueButton.png"),
    new ImageIcon("LightGrayButton.png"),
    new ImageIcon("DarkGrayButton.png"),
  };  
  JButton[][] shinyButtons;

  public ShinyButtonsApp(String title)
  {
    super(title);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setSize(578,634);
    setResizable(false);
    getContentPane().setLayout(null);


    shinyButtons = new JButton[8][8];


    for(byte row=0; row<8; row++)
    {
      for(byte col=0; col<8; col++)
      {
        ImageIcon randomValue = icons[(byte)(Math.random() * icons.length)];
        shinyButtons[row][col] = new JButton(randomValue);
        shinyButtons[row][col].setLocation(10+col*69, 10+row*69);
        shinyButtons[row][col].setSize(69,69);
        getContentPane().add(shinyButtons[row][col]);
      }
    }


    JButton red = new JButton(icons[0]);
    red.setLocation(200,200);
    red.setSize(69,69);
    getContentPane().add(red);

    //add the NEW GAME button
    JButton newGame = new JButton("New Game");
    newGame.setLocation(350,570);
    newGame.setSize(100, 25);
    getContentPane().add(newGame);

    //add the QUIT button
    JButton quit = new JButton("Quit");
    quit.setLocation(460, 570);
    quit.setSize(100,25);
    getContentPane().add(quit);

    //add the SCORE text field
    JTextField score = new JTextField();
    score.setText(Integer.toString(shiny.score));
    score.setEditable(false);
    score.setLocation(70, 577);
    score.setSize(100,20);
    getContentPane().add(score);

    //add the SCORE label
    JLabel scoreLabel = new JLabel("Score:");
    scoreLabel.setLocation(18,537);
    scoreLabel.setSize(100,100);
    getContentPane().add(scoreLabel);

     quit.addActionListener(new ActionListener()
      {
      public void actionPerformed(ActionEvent e)
      {
        System.exit(0);      
      }
    });  


          newGame.addActionListener(new ActionListener()
      {
      public void actionPerformed(ActionEvent e)
      {
          reset();
      }
    });
  }

  private void reset() {
      for(byte row=0; row<8; row++)
    {
      for(byte col=0; col<8; col++)
      {
        ImageIcon randomValue = icons[(byte)(Math.random() * icons.length)];
        shinyButtons[row][col] = new JButton(randomValue);
        shinyButtons[row][col].setLocation(10+col*69, 10+row*69);
        shinyButtons[row][col].setSize(69,69);
        getContentPane().add(shinyButtons[row][col]);
      }
    }
  }


  public void actionPerformed(ActionEvent e)
  {

  }

  public static void main(String args[])
  {
    ShinyButtonsApp buttons;
    buttons = new ShinyButtonsApp("Shiny Buttons");
    buttons.setVisible(true);

  }
}

Answer 1

將System.out.println()添加到您的reset（）方法中以查看發生了什么：

private void reset() {
    for (byte row = 0; row < 8; row++) {
        for (byte col = 0; col < 8; col++) {
            ImageIcon randomValue = icons[(byte) (Math.random() * icons.length)];
            shinyButtons[row][col] = new JButton(randomValue);
            shinyButtons[row][col].setLocation(10 + col * 69, 10 + row * 69);
            shinyButtons[row][col].setSize(69, 69);
            getContentPane().add(shinyButtons[row][col]);
        }
    }

    System.out.println(getContentPane().getComponentCount());
}

您不會刪除以前添加的舊按鈕。 考慮使用適當的LayoutManager，例如GridLayout。 我還要重新考慮您的設計：您不需要刪除然后重新添加按鈕。 將數據的狀態與UI分開存儲。

試試這個...創建一個變量來存儲游戲狀態：

private final ImageIcon[][] data = new ImageIcon[8][8];

在您的reset（）方法中設置游戲狀態：

private void reset() {  // no need to add the buttons again
    for (byte row = 0; row < 8; row++) {
        for (byte col = 0; col < 8; col++) {
            data[row][col] = icons[(byte) (Math.random() * icons.length)];
            shinyButtons[row][col].setIcon(data[row][col]);
        }
    }
}

首次創建按鈕時，請不要忘記初始化游戲狀態：

    for (byte row = 0; row < 8; row++) {
        for (byte col = 0; col < 8; col++) {
            shinyButtons[row][col] = new JButton();
            shinyButtons[row][col].setLocation(10 + col * 69, 10 + row * 69);
            shinyButtons[row][col].setSize(69, 69);
            getContentPane().add(shinyButtons[row][col]);
        }
    }

    reset();