写一个贪吃蛇游戏的JAVA代码

这是一个简单的贪吃蛇游戏JAVA代码，仅供参考：

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

public class SnakeGame extends JFrame implements KeyListener
{
    private static final long serialVersionUID = 1L;

    private int x = 50, y = 50;
    private int width = 20, height = 20;
    private int dx = width, dy = 0;
    private int foodX = 100, foodY = 100;
    private int score = 0;

    private boolean isGameOver = false;

    private Timer timer;
    private int delay = 100;

    private int[] snakeX = new int[1000];
    private int[] snakeY = new int[1000];
    private int snakeLength = 3;

    public SnakeGame()
    {
        setTitle("贪吃蛇");
        setSize(500, 500);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        addKeyListener(this);

        timer = new Timer(delay, new ActionListener()
        {
            @Override
            public void actionPerformed(ActionEvent e)
            {
                move();
                repaint();
            }
        });
        timer.start();

        setVisible(true);
    }

    public void paint(Graphics g)
    {
        super.paint(g);

        g.setColor(Color.RED);
        g.fillRect(foodX, foodY, width, height);

        for (int i = 0; i < snakeLength; i++)
        {
            g.setColor(Color.GREEN);
            g.fillRect(snakeX[i], snakeY[i], width, height);
        }

        g.setColor(Color.BLACK);
        g.drawString("得分: " + score, 10, 20);

        if (isGameOver)
        {
            g.setColor(Color.RED);
            g.drawString("游戏结束！", getWidth() / 2 - 50, getHeight() / 2);
        }
    }

    private void move()
    {
        for (int i = snakeLength - 1; i > 0; i--)
        {
            snakeX[i] = snakeX[i - 1];
            snakeY[i] = snakeY[i - 1];
        }

        snakeX[0] += dx;
        snakeY[0] += dy;

        if (snakeX[0] < 0 || snakeX[0] + width > getWidth() || snakeY[0] < 0 || snakeY[0] + height > getHeight())
        {
            isGameOver = true;
            timer.stop();
        }

        if (snakeX[0] == foodX && snakeY[0] == foodY)
        {
            score++;
            snakeLength++;
            foodX = (int)(Math.random() * (getWidth() - width));
            foodY = (int)(Math.random() * (getHeight() - height));
        }

        for (int i = 1; i < snakeLength; i++)
        {
            if (snakeX[0] == snakeX[i] && snakeY[0] == snakeY[i])
            {
                isGameOver = true;
                timer.stop();
                break;
            }
        }
    }

    @Override
    public void keyPressed(KeyEvent e)
    {
        switch (e.getKeyCode())
        {
            case KeyEvent.VK_UP:
                if (dy != height)
                {
                    dx = 0;
                    dy = -height;
                }
                break;
            case KeyEvent.VK_DOWN:
                if (dy != -height)
                {
                    dx = 0;
                    dy = height;
                }
                break;
            case KeyEvent.VK_LEFT:
                if (dx != width)
                {
                    dx = -width;
                    dy = 0;
                }
                break;
            case KeyEvent.VK_RIGHT:
                if (dx != -width)
                {
                    dx = width;
                    dy = 0;
                }
                break;
        }
    }

    @Override
    public void keyTyped(KeyEvent e) {}

    @Override
    public void keyReleased(KeyEvent e) {}
    
    public static void main(String[] args)
    {
        new SnakeGame();
    }
}