贪吃蛇的Java代码

以下是一个简单的贪吃蛇Java代码，仅供参考：

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

public class Snake extends JFrame implements ActionListener {
    private static final long serialVersionUID = 1L;
    private static final int WIDTH = 500, HEIGHT = 500;
    private Timer timer;
    private int DELAY = 100;
    private int x = 10, y = 10, size = 10;
    private int apple_x, apple_y;
    private ArrayList<Point> snake;
    private int direction = KeyEvent.VK_RIGHT;

    public Snake() {
        setTitle("Snake");
        setSize(WIDTH, HEIGHT);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        setResizable(false);
        setVisible(true);

        JPanel panel = new JPanel();
        getContentPane().add(panel);
        panel.setFocusable(true);
        panel.addKeyListener(new KeyAdapter() {
            public void keyPressed(KeyEvent e) {
                int key = e.getKeyCode();
                if (key == KeyEvent.VK_LEFT && direction != KeyEvent.VK_RIGHT) {
                    direction = KeyEvent.VK_LEFT;
                } else if (key == KeyEvent.VK_RIGHT && direction != KeyEvent.VK_LEFT) {
                    direction = KeyEvent.VK_RIGHT;
                } else if (key == KeyEvent.VK_UP && direction != KeyEvent.VK_DOWN) {
                    direction = KeyEvent.VK_UP;
                } else if (key == KeyEvent.VK_DOWN && direction != KeyEvent.VK_UP) {
                    direction = KeyEvent.VK_DOWN;
                }
            }
        });

        timer = new Timer(DELAY, this);
        startGame();
    }

    private void startGame() {
        snake = new ArrayList<Point>();
        snake.add(new Point(x, y));
        generateApple();
        timer.start();
    }

    private void generateApple() {
        apple_x = (int) (Math.random() * (WIDTH / size)) * size;
        apple_y = (int) (Math.random() * (HEIGHT / size)) * size;
    }

    private void move() {
        Point head = snake.get(0);
        switch (direction) {
            case KeyEvent.VK_LEFT:
                x -= size;
                break;
            case KeyEvent.VK_RIGHT:
                x += size;
                break;
            case KeyEvent.VK_UP:
                y -= size;
                break;
            case KeyEvent.VK_DOWN:
                y += size;
                break;
        }
        head.setLocation(x, y);
        checkCollision();
        if (x == apple_x && y == apple_y) {
            snake.add(new Point(x, y));
            generateApple();
        } else {
            snake.remove(snake.size() - 1);
        }
    }

    private void checkCollision() {
        if (x < 0 || x >= WIDTH || y < 0 || y >= HEIGHT) {
            gameOver();
        }
        for (int i = 1; i < snake.size(); i++) {
            if (x == snake.get(i).getX() && y == snake.get(i).getY()) {
                gameOver();
            }
        }
    }

    private void gameOver() {
        timer.stop();
        JOptionPane.showMessageDialog(this, "Game Over", "Game Over", JOptionPane.YES_NO_OPTION);
        startGame();
    }

    public void actionPerformed(ActionEvent e) {
        move();
        repaint();
    }

    public void paint(Graphics g) {
        super.paint(g);
        g.setColor(Color.RED);
        g.fillRect(apple_x, apple_y, size, size);
        g.setColor(Color.BLACK);
        for (Point p : snake) {
            g.fillRect((int) p.getX(), (int) p.getY(), size, size);
        }
    }

    public static void main(String[] args) {
        new Snake();
    }
}

这个代码实现了一个简单的贪吃蛇游戏，玩家可以通过方向键控制蛇的移动方向，吃到苹果后蛇会变长，如果蛇触碰到边界或自己的身体则游戏结束。