简单的小程序游戏错误

我遇到了我的小程序问题。它的目的是创建一个游戏，您可以在屏幕底部移动一个块，以适应从上面掉落的块中的洞。我已经实现了这个块，但是当我按下一个键时我无法移动这个块。这里是我的源代码：简单的小程序游戏错误

import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 
public class MathewBorumGame extends JApplet 
{ 
    public void init() 
    { 
     Dimension dim = getSize(); 
     MathewBorumGamePanel avoidance = new MathewBorumGamePanel(dim); 
     add(avoidance); 
     Thread game = new Thread(avoidance); 
     game.start(); 
    } 
}// end of the extended JApplet class 

class MathewBorumGamePanel extends JPanel implements Runnable{ 
    protected int x = 225; 
    protected int y = 450; 
    private int speed = 0; 
    private boolean isPlaying = false; 
    private boolean hasHit = false; 
    private String instructions = "Press 'Enter' to start survive as long as" 
     + " as possible."; 
    private String keyInstructions = "Use arrow keys to move."; 
    private String test; 
    private Dimension dim = null; 
    private Thread game = null; 
    private Timer timer = new Timer(1000, new TimerListener()); 
    public MathewBorumGamePanel(Dimension paramDimension) { 
     this.dim = paramDimension; 
     setBackground(new Color(255, 255, 204)); 
     setForeground(Color.black); 
     addKeyListener(new KeyAdapter() { 
      public void keyPressed(KeyEvent e) { 
         switch (e.getKeyCode()) { 
        case KeyEvent.VK_LEFT: 
         if(x >= 10) x = x - 10; 
         repaint(); 
         break; 
        case KeyEvent.VK_RIGHT: 
         if(x <= 490) x = x + 10; 
         repaint(); 
         break; 
        default: 
         repaint(); 
         break; 
       } 
      } 
     }); 
    } 
    public void run() { 
     for (;;) { 
      repaint(); 
     } 
    } 
    public void paintComponent(Graphics paramGraphics) { 
     super.paintComponent(paramGraphics); 
     paramGraphics.fillRect(x, y, 50, 15); 
     paramGraphics.setFont(new Font("Serif", Font.BOLD, 15)); 
     paramGraphics.drawString(this.instructions, 30, 30); 
     paramGraphics.drawString(this.keyInstructions, 30, 50); 
     test = test.valueOf(x); 
     paramGraphics.drawString(test, 30, 70); 
    } 

    private class TimerListener implements ActionListener { 
     public void actionPerformed(ActionEvent e) { 
      repaint(); 
     } 
    } 
}//end of the extended JPanel class

感谢

来源

2013-05-13 mattersonline

覆盖'公共无效漆（图形paramGraphics）'，而不是'的paintComponent（）'。另外，我不确定你的方法是否正确，因为我看着你无限循环重绘，但也有一个计时器触发每秒，并且是什么......重绘。但是，我无法看到您启动计时器的位置，所以让我们认为这是您最终工作的一个非常原始的版本:)让我知道我的提示的结果。 – Noe 2013-05-14 13:45:31

@Noe *“Override public void'paint（Graphics paramGraphics）''而不是'paintComponent（）'。”*错！ – 2013-05-14 13:47:31

特别是，“Swing程序应该重写'paintComponent（）'而不是重写'paint（）'。” - [* AWT和Swing中的绘画：绘画方法*]（http://www.oracle.com/technetwork /java/painting-140037.html#callbacks） – trashgod 2013-05-15 03:58:56

见在一些进一步的提示代码注释..

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

// <applet code='MathewBorumGame' width=400 height=400></applet> 
public class MathewBorumGame extends JApplet 
{ 
    public void init() 
    { 
     Dimension dim = getSize(); 
     MathewBorumGamePanel avoidance = new MathewBorumGamePanel(dim); 
     add(avoidance); 
     /* 
     Thread game = new Thread(avoidance); 
     game.start();*/ 
    } 
}// end of the extended JApplet class 

class MathewBorumGamePanel extends JPanel { //implements Runnable{ 
    protected int x = 225; 
    protected int y = 450; 
    private int speed = 0; 
    private boolean isPlaying = false; 
    private boolean hasHit = false; 
    private String instructions = "Press 'Enter' to start survive as long as" 
     + " as possible."; 
    private String keyInstructions = "Use arrow keys to move."; 
    private String test; 
    private Dimension dim = null; 
    private Thread game = null; 
    private Timer timer = new Timer(1000, new TimerListener()); 
    public MathewBorumGamePanel(Dimension paramDimension) { 
     this.dim = paramDimension; 
     setBackground(new Color(255, 255, 204)); 
     setForeground(Color.black); 
     addKeyListener(new KeyAdapter() { 
      public void keyPressed(KeyEvent e) { 
         switch (e.getKeyCode()) { 
        case KeyEvent.VK_LEFT: 
         System.out.println("Go left"); 
         if(x >= 10) x = x - 10; 
         repaint(); 
         break; 
        case KeyEvent.VK_RIGHT: 
         System.out.println("Go right"); 
         if(x <= 490) x = x + 10; 
         repaint(); 
         break; 
        default: 
         //repaint(); 
         break; 
       } 
      } 
     }); 
     // Must be focusable! 
     setFocusable(true); 
     // very important! Must have focus.. 
     requestFocusInWindow(); 
     timer.start(); 
    } 

    /* THIS IS NOT HOW TO DO ANIMATION! 
    @Override 
    public void run() { 
     for (;;) { 
      repaint(); 
     } 
    }*/ 

    public void paintComponent(Graphics paramGraphics) { 
     super.paintComponent(paramGraphics); 
     paramGraphics.fillRect(x, y, 50, 15); 
     paramGraphics.setFont(new Font("Serif", Font.BOLD, 15)); 
     paramGraphics.drawString(this.instructions, 30, 30); 
     paramGraphics.drawString(this.keyInstructions, 30, 50); 
     test = test.valueOf(x); 
     paramGraphics.drawString(test, 30, 70); 
    } 

    private class TimerListener implements ActionListener { 
     public void actionPerformed(ActionEvent e) { 
      repaint(); 
     } 
    } 
}//end of the extended JPanel class

来源

2013-05-14 13:49:06

简单的小程序游戏错误

回答

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