java 1.8写个贪吃蛇

好的，以下是Java 1.8版本的贪吃蛇游戏示例代码：

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

public class SnakeGame extends JFrame implements ActionListener {
    private static final long serialVersionUID = 1L;
    private final int WIDTH = 300;
    private final int HEIGHT = 300;
    private final int DOT_SIZE = 10;
    private final int ALL_DOTS = 900;
    private final int RAND_POS = 29;
    private final int DELAY = 140;
    private final int x[] = new int[ALL_DOTS];
    private final int y[] = new int[ALL_DOTS];
    private int dots;
    private int food_x;
    private int food_y;
    private boolean leftDirection = false;
    private boolean rightDirection = true;
    private boolean upDirection = false;
    private boolean downDirection = false;
    private boolean inGame = true;
    private Timer timer;
    private Image ball;
    private Image food;
    private Image head;

    public SnakeGame() {
        initGame();
        initUI();
    }

    private void initGame() {
        dots = 3;
        for (int i = 0; i < dots; i++) {
            x[i] = 50 - i * DOT_SIZE;
            y[i] = 50;
        }
        locateFood();
        timer = new Timer(DELAY, this);
        timer.start();
    }

    private void initUI() {
        setTitle("Snake");
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setResizable(false);
        setSize(WIDTH, HEIGHT);
        addKeyListener(new TAdapter());
        setVisible(true);
        ball = new ImageIcon("dot.png").getImage();
        food = new ImageIcon("apple.png").getImage();
        head = new ImageIcon("head.png").getImage();
    }

    @Override
    public void paint(Graphics g) {
        super.paint(g);
        if (inGame) {
            g.drawImage(food, food_x, food_y, this);
            for (int i = 0; i < dots; i++) {
                if (i == 0) {
                    g.drawImage(head, x[i], y[i], this);
                } else {
                    g.drawImage(ball, x[i], y[i], this);
                }
            }
            Toolkit.getDefaultToolkit().sync();
        } else {
            gameOver(g);
        }
    }

    private void gameOver(Graphics g) {
        String msg = "Game Over";
        Font small = new Font("Helvetica", Font.BOLD, 14);
        FontMetrics metr = getFontMetrics(small);
        g.setColor(Color.white);
        g.setFont(small);
        g.drawString(msg, (WIDTH - metr.stringWidth(msg)) / 2, HEIGHT / 2);
    }

    private void checkFood() {
        if ((x[0] == food_x) && (y[0] == food_y)) {
            dots++;
            locateFood();
        }
    }

    private void move() {
        for (int i = dots; i > 0; i--) {
            x[i] = x[(i - 1)];
            y[i] = y[(i - 1)];
        }
        if (leftDirection) {
            x[0] -= DOT_SIZE;
        }
        if (rightDirection) {
            x[0] += DOT_SIZE;
        }
        if (upDirection) {
            y[0] -= DOT_SIZE;
        }
        if (downDirection) {
            y[0] += DOT_SIZE;
        }
    }

    private void checkCollision() {
        for (int i = dots; i > 0; i--) {
            if ((i > 4) && (x[0] == x[i]) && (y[0] == y[i])) {
                inGame = false;
            }
        }
        if (y[0] >= HEIGHT) {
            inGame = false;
        }
        if (y[0] < 0) {
            inGame = false;
        }
        if (x[0] >= WIDTH) {
            inGame = false;
        }
        if (x[0] < 0) {
            inGame = false;
        }
        if (!inGame) {
            timer.stop();
        }
    }

    private void locateFood() {
        int r = new Random().nextInt(RAND_POS);
        food_x = ((r * DOT_SIZE));
        r = new Random().nextInt(RAND_POS);
        food_y = ((r * DOT_SIZE));
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (inGame) {
            checkFood();
            checkCollision();
            move();
        }
        repaint();
    }

    private class TAdapter extends KeyAdapter {
        @Override
        public void keyPressed(KeyEvent e) {
            int key = e.getKeyCode();
            if ((key == KeyEvent.VK_LEFT) && (!rightDirection)) {
                leftDirection = true;
                upDirection = false;
                downDirection = false;
            }
            if ((key == KeyEvent.VK_RIGHT) && (!leftDirection)) {
                rightDirection = true;
                upDirection = false;
                downDirection = false;
            }
            if ((key == KeyEvent.VK_UP) && (!downDirection)) {
                upDirection = true;
                rightDirection = false;
                leftDirection = false;
            }
            if ((key == KeyEvent.VK_DOWN) && (!upDirection)) {
                downDirection = true;
                rightDirection = false;
                leftDirection = false;
            }
        }
    }

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

注意：此为基本示例代码，可以根据自己的需求进行修改和扩展。