Java实现贪吃蛇代码

好的，下面是一个简单的Java实现贪吃蛇的代码示例：

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 Snake extends JPanel implements Runnable, KeyListener {
    private static final long serialVersionUID = 1L;
    private static final int WIDTH = 500;
    private static final int HEIGHT = 500;

    private LinkedList<Point> snake;
    private Point food;
    private Random rand;
    private int direction;
    private boolean gameOver;

    public Snake() {
        snake = new LinkedList<Point>();
        snake.add(new Point(WIDTH/2, HEIGHT/2));
        snake.add(new Point(WIDTH/2, HEIGHT/2+10));
        snake.add(new Point(WIDTH/2, HEIGHT/2+20));
        food = new Point(0, 0);
        rand = new Random();
        direction = KeyEvent.VK_UP;
        gameOver = false;
        setPreferredSize(new Dimension(WIDTH, HEIGHT));
        addKeyListener(this);
    }

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

    public void run() {
        while (!gameOver) {
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            moveSnake();
            checkCollision();
            repaint();
        }
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.setColor(Color.GREEN);
        for (Point p : snake) {
            g.fillRect(p.x, p.y, 10, 10);
        }
        g.setColor(Color.RED);
        g.fillRect(food.x, food.y, 10, 10);
        if (gameOver) {
            g.setColor(Color.BLACK);
            g.drawString("Game Over!", WIDTH/2-30, HEIGHT/2);
        }
    }

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

    public void keyTyped(KeyEvent e) {}
    public void keyReleased(KeyEvent e) {}

    private void moveSnake() {
        Point head = snake.getFirst();
        int x = head.x;
        int y = head.y;
        switch (direction) {
        case KeyEvent.VK_UP:
            y -= 10;
            break;
        case KeyEvent.VK_DOWN:
            y += 10;
            break;
        case KeyEvent.VK_LEFT:
            x -= 10;
            break;
        case KeyEvent.VK_RIGHT:
            x += 10;
            break;
        }
        snake.addFirst(new Point(x, y));
        if (food.equals(head)) {
            generateFood();
        } else {
            snake.removeLast();
        }
    }

    private void generateFood() {
        int x = rand.nextInt(WIDTH/10)*10;
        int y = rand.nextInt(HEIGHT/10)*10;
        food.setLocation(x, y);
    }

    private void checkCollision() {
        Point head = snake.getFirst();
        if (head.x < 0 || head.x >= WIDTH || head.y < 0 || head.y >= HEIGHT) {
            gameOver = true;
        }
        for (Point p : snake.subList(1, snake.size())) {
            if (head.equals(p)) {
                gameOver = true;
                break;
            }
        }
    }

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

这个示例代码实现了一个简单的贪吃蛇游戏，使用了Java Swing绘制界面。游戏的主要逻辑在`moveSnake()`方法中实现，包括蛇的移动、吃食物等操作。`checkCollision()`方法用于检测游戏是否结束，如果蛇碰到墙壁或自己的身体，则游戏结束。

你可以将这个代码示例保存为`Snake.java`文件，并在命令行中编译运行它。