求一个JAVA编写的贪吃蛇小游戏源代码,就快要课程设计啦!有原文件更好啊!跪求啊!

import java.awt.*;import java.awt.event.*;import javax.swing.*;import java.util.*;public class GreedSnake implements KeyListener{ JFrame mainFrame;Canvas paintCanvas;JLabel labelScore;SnakeModel snakeModel = null;public static final int canvasWidth = 200;public static final int canvasHeight = 300;public static final int nodeWidth = 10;public static final int nodeHeight = 10;public GreedSnake() { mainFrame = new JFrame("GreedSnake");Container cp = mainFrame.getContentPane();labelScore = new JLabel("Score:");cp.add(labelScore, BorderLayout.NORTH);paintCanvas = new Canvas();paintCanvas.setSize(canvasWidth+1,canvasHeight+1);paintCanvas.addKeyListener(this);cp.add(paintCanvas, BorderLayout.CENTER);JPanel panelButtom = new JPanel();panelButtom.setLayout(new BorderLayout());JLabel labelHelp;labelHelp = new JLabel("PageUp, PageDown for speed;", JLabel.CENTER);panelButtom.add(labelHelp, BorderLayout.NORTH);labelHelp = new JLabel("ENTER or R or S for start;", JLabel.CENTER);panelButtom.add(labelHelp, BorderLayout.CENTER);labelHelp = new JLabel("SPACE or P for pause",JLabel.CENTER);panelButtom.add(labelHelp, BorderLayout.SOUTH);cp.add(panelButtom,BorderLayout.SOUTH);mainFrame.addKeyListener(this);mainFrame.pack();mainFrame.setResizable(false);mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);mainFrame.setVisible(true);begin();} public void keyPressed(KeyEvent e){ int keyCode = e.getKeyCode();if (snakeModel.running) switch(keyCode){ case KeyEvent.VK_UP: snakeModel.changeDirection(SnakeModel.UP);break;case KeyEvent.VK_DOWN: snakeModel.changeDirection(SnakeModel.DOWN);break;case KeyEvent.VK_LEFT: snakeModel.changeDirection(SnakeModel.LEFT);break;case KeyEvent.VK_RIGHT: snakeModel.changeDirection(SnakeModel.RIGHT);break;case KeyEvent.VK_ADD: case KeyEvent.VK_PAGE_UP: snakeModel.speedUp();break;case KeyEvent.VK_SUBTRACT: case KeyEvent.VK_PAGE_DOWN: snakeModel.speedDown();break;case KeyEvent.VK_SPACE: case KeyEvent.VK_P: snakeModel.changePauseState();break;default: } if (keyCode == KeyEvent.VK_R || keyCode == KeyEvent.VK_S || keyCode == KeyEvent.VK_ENTER){ snakeModel.running = false;begin();} } public void keyReleased(KeyEvent e){ } public void keyTyped(KeyEvent e){ } void repaint(){ Graphics g = paintCanvas.getGraphics();//draw background g.setColor(Color.WHITE);g.fillRect(0,0,canvasWidth,canvasHeight);收起