我的小程序有问题。它的目的是创建一个游戏,您可以在其中移动屏幕底部的块以穿过从上方落下的块中的孔。我已经实现了这个块,但是当我按下一个键时我不能让块移动。这是我的源代码:
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
谢谢