写个贪吃蛇java代码

好的，以下是一个简单的Java贪吃蛇游戏代码：

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

public class SnakeGame extends JFrame implements ActionListener {
    private JPanel board;
    private JButton start;
    private JLabel score;
    private Timer timer;
    private int delay = 100;

    private int[] x = new int[100];
    private int[] y = new int[100];
    private int bodyParts = 3;
    private int applesEaten = 0;
    private int appleX;
    private int appleY;
    private char direction = 'R';

    public SnakeGame() {
        setTitle("Snake Game");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(400, 400);

        board = new JPanel();
        board.setBackground(Color.BLACK);
        board.setLayout(null);
        add(board);

        start = new JButton("Start");
        start.setBounds(150, 300, 100, 30);
        start.addActionListener(this);
        board.add(start);

        score = new JLabel("Score: 0");
        score.setForeground(Color.WHITE);
        score.setBounds(10, 10, 100, 20);
        board.add(score);

        addKeyListener(new KeyAdapter() {
            public void keyPressed(KeyEvent e) {
                switch (e.getKeyCode()) {
                    case KeyEvent.VK_LEFT:
                        if (direction != 'R') direction = 'L';
                        break;
                    case KeyEvent.VK_RIGHT:
                        if (direction != 'L') direction = 'R';
                        break;
                    case KeyEvent.VK_UP:
                        if (direction != 'D') direction = 'U';
                        break;
                    case KeyEvent.VK_DOWN:
                        if (direction != 'U') direction = 'D';
                        break;
                }
            }
        });

        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == start) {
            start();
        } else {
            move();
            checkCollision();
            checkApple();
            board.repaint();
        }
    }

    public void start() {
        start.setEnabled(false);
        x[0] = 0;
        y[0] = 0;
        x[1] = -10;
        y[1] = 0;
        x[2] = -20;
        y[2] = 0;
        generateApple();
        timer = new Timer(delay, this);
        timer.start();
    }

    public void generateApple() {
        appleX = (int) (Math.random() * 39) * 10;
        appleY = (int) (Math.random() * 39) * 10;
    }

    public void move() {
        for (int i = bodyParts; i > 0; i--) {
            x[i] = x[i - 1];
            y[i] = y[i - 1];
        }
        switch (direction) {
            case 'L':
                x[0] -= 10;
                break;
            case 'R':
                x[0] += 10;
                break;
            case 'U':
                y[0] -= 10;
                break;
            case 'D':
                y[0] += 10;
                break;
        }
    }

    public void checkCollision() {
        for (int i = bodyParts; i > 0; i--) {
            if (x[0] == x[i] && y[0] == y[i]) {
                gameOver();
            }
        }
        if (x[0] < 0 || x[0] > 390 || y[0] < 0 || y[0] > 390) {
            gameOver();
        }
    }

    public void checkApple() {
        if (x[0] == appleX && y[0] == appleY) {
            bodyParts++;
            applesEaten++;
            score.setText("Score: " + applesEaten);
            generateApple();
        }
    }

    public void gameOver() {
        start.setEnabled(true);
        timer.stop();
        JOptionPane.showMessageDialog(this, "Game Over!");
    }

    public void paint(Graphics g) {
        super.paint(g);
        g.setColor(Color.RED);
        g.fillRect(appleX, appleY, 10, 10);
        for (int i = 0; i < bodyParts; i++) {
            if (i == 0) {
                g.setColor(Color.GREEN);
            } else {
                g.setColor(Color.WHITE);
            }
            g.fillRect(x[i], y[i], 10, 10);
        }
    }

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

这个代码创建了一个简单的贪吃蛇游戏，玩家可以使用方向键控制贪吃蛇的移动，吃掉苹果得分。如果贪吃蛇撞到边界或者自己的身体，则游戏结束。