使用Java实现贪吃蛇

好的，以下是使用Java实现贪吃蛇的简单代码示例：

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

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

public class SnakeGame extends JPanel implements Runnable, KeyListener {

    private static final long serialVersionUID = 1L;

    // 游戏区域宽度和高度
    private static final int WIDTH = 500;
    private static final int HEIGHT = 500;

    // 蛇的大小和速度
    private static final int SIZE = 10;
    private static final int SPEED = 40;

    // 游戏是否结束标志
    private boolean gameOver = false;

    // 蛇的初始位置和方向
    private ArrayList<Point> snake = new ArrayList<Point>();
    private int direction = KeyEvent.VK_RIGHT;

    // 食物的位置
    private Point food;

    // 随机数生成器
    private Random random = new Random();

    public SnakeGame() {
        setPreferredSize(new Dimension(WIDTH, HEIGHT));
        setBackground(Color.BLACK);
        setFocusable(true);
        addKeyListener(this);

        // 初始化蛇的位置
        snake.add(new Point(100, 100));
        snake.add(new Point(90, 100));
        snake.add(new Point(80, 100));

        // 初始化食物的位置
        food = new Point(random.nextInt(WIDTH / SIZE) * SIZE, random.nextInt(HEIGHT / SIZE) * SIZE);
    }

    public void run() {
        while (!gameOver) {
            try {
                Thread.sleep(SPEED);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            // 移动蛇的位置
            Point head = snake.get(0);
            Point newHead = new Point(head);
            switch (direction) {
            case KeyEvent.VK_UP:
                newHead.y -= SIZE;
                break;
            case KeyEvent.VK_DOWN:
                newHead.y += SIZE;
                break;
            case KeyEvent.VK_LEFT:
                newHead.x -= SIZE;
                break;
            case KeyEvent.VK_RIGHT:
                newHead.x += SIZE;
                break;
            }
            snake.add(0, newHead);
            snake.remove(snake.size() - 1);

            // 判断是否吃到食物
            if (newHead.equals(food)) {
                food.setLocation(random.nextInt(WIDTH / SIZE) * SIZE, random.nextInt(HEIGHT / SIZE) * SIZE);
            } else {
                snake.remove(snake.size() - 1);
            }

            // 判断游戏是否结束
            if (newHead.x < 0 || newHead.x >= WIDTH || newHead.y < 0 || newHead.y >= HEIGHT || snake.contains(newHead)) {
                gameOver = true;
            }

            // 重新绘制游戏界面
            repaint();
        }
    }

    public void keyPressed(KeyEvent e) {
        switch (e.getKeyCode()) {
        case KeyEvent.VK_UP:
        case KeyEvent.VK_DOWN:
        case KeyEvent.VK_LEFT:
        case KeyEvent.VK_RIGHT:
            direction = e.getKeyCode();
            break;
        }
    }

    public void keyReleased(KeyEvent e) {
    }

    public void keyTyped(KeyEvent e) {
    }

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

        // 绘制食物
        g.setColor(Color.RED);
        g.fillRect(food.x, food.y, SIZE, SIZE);

        // 绘制蛇
        g.setColor(Color.GREEN);
        for (Point p : snake) {
            g.fillRect(p.x, p.y, SIZE, SIZE);
        }

        // 绘制游戏结束信息
        if (gameOver) {
            g.setColor(Color.WHITE);
            g.drawString("Game Over!", WIDTH / 2 - 40, HEIGHT / 2);
        }
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Snake Game");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setContentPane(new SnakeGame());
        frame.pack();
        frame.setVisible(true);

        Thread thread = new Thread((SnakeGame)frame.getContentPane());
        thread.start();
    }

}

运行该代码，即可开始玩贪吃蛇游戏。