用java写一个贪吃蛇的代码

好的，以下是一个简单的Java贪吃蛇游戏的示例代码。由于篇幅限制，我只提供了核心代码，您可以基于这个代码进行修改和拓展。

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.LinkedList;
import java.util.Random;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class SnakeGame extends JPanel implements KeyListener, Runnable {

    private static final long serialVersionUID = 1L;
    private final int BOX_SIZE = 10;
    private final int WIDTH = 600;
    private final int HEIGHT = 400;
    private final int GAME_WIDTH = WIDTH / BOX_SIZE;
    private final int GAME_HEIGHT = HEIGHT / BOX_SIZE;
    private int x, y;
    private int dx, dy;
    private boolean leftDirection = false;
    private boolean rightDirection = true;
    private boolean upDirection = false;
    private boolean downDirection = false;
    private boolean inGame = true;
    private Thread thread;
    private LinkedList<Point> snake = new LinkedList<Point>();
    private Point food;
    private Random random = new Random();

    public SnakeGame() {
        addKeyListener(this);
        setFocusable(true);
        setPreferredSize(new Dimension(WIDTH, HEIGHT));
        initGame();
    }

    private void initGame() {
        x = (GAME_WIDTH / 2) * BOX_SIZE;
        y = (GAME_HEIGHT / 2) * BOX_SIZE;
        dx = BOX_SIZE;
        dy = 0;
        snake.clear();
        snake.add(new Point(x, y));
        generateFood();
        inGame = true;
    }

    private void generateFood() {
        int fx = random.nextInt(GAME_WIDTH) * BOX_SIZE;
        int fy = random.nextInt(GAME_HEIGHT) * BOX_SIZE;
        food = new Point(fx, fy);
    }

    private void move() {
        Point head = snake.getFirst();
        int nx = head.x + dx;
        int ny = head.y + dy;
        if (nx < 0 || nx >= WIDTH || ny < 0 || ny >= HEIGHT) {
            inGame = false;
        } else if (snake.contains(new Point(nx, ny))) {
            inGame = false;
        } else if (nx == food.x && ny == food.y) {
            snake.addFirst(food);
            generateFood();
        } else {
            snake.removeLast();
            snake.addFirst(new Point(nx, ny));
        }
    }

    private void checkCollision() {
        if (!inGame) {
            thread.interrupt();
        }
    }

    private void draw(Graphics g) {
        g.clearRect(0, 0, WIDTH, HEIGHT);
        g.setColor(Color.BLACK);
        snake.forEach(p -> g.fillRect(p.x, p.y, BOX_SIZE, BOX_SIZE));
        g.setColor(Color.RED);
        g.fillRect(food.x, food.y, BOX_SIZE, BOX_SIZE);
    }

    private void gameLoop() {
        while (inGame) {
            move();
            checkCollision();
            repaint();
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
                break;
            }
        }
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        draw(g);
    }

    @Override
    public void keyPressed(KeyEvent e) {
        int key = e.getKeyCode();
        if (key == KeyEvent.VK_LEFT && !rightDirection) {
            leftDirection = true;
            upDirection = false;
            downDirection = false;
            dx = -BOX_SIZE;
            dy = 0;
        } else if (key == KeyEvent.VK_RIGHT && !leftDirection) {
            rightDirection = true;
            upDirection = false;
            downDirection = false;
            dx = BOX_SIZE;
            dy = 0;
        } else if (key == KeyEvent.VK_UP && !downDirection) {
            upDirection = true;
            leftDirection = false;
            rightDirection = false;
            dx = 0;
            dy = -BOX_SIZE;
        } else if (key == KeyEvent.VK_DOWN && !upDirection) {
            downDirection = true;
            leftDirection = false;
            rightDirection = false;
            dx = 0;
            dy = BOX_SIZE;
        }
    }

    @Override
    public void keyReleased(KeyEvent e) {
    }

    @Override
    public void keyTyped(KeyEvent e) {
    }

    @Override
    public void run() {
        gameLoop();
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Snake Game");
        SnakeGame snakeGame = new SnakeGame();
        frame.add(snakeGame);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
        snakeGame.start();
    }

    public void start() {
        thread = new Thread(this);
        thread.start();
    }
}

这个代码实现了一个简单的贪吃蛇游戏，使用了Java Swing库来进行游戏界面的绘制和更新。您可以在自己的计算机上运行这个代码，看一下这个示例程序的效果。