利用Java开发一个贪吃蛇游戏，基本功能要求如下： 1、初始蛇长度为1，蛇吃到蛋长度加1。 2、蛋随机出现。 3、蛇碰到四壁或自己则死亡 4、计分，比如吃一个蛋得100分 5、可以暂停。 6、死后，可以按某个键重新开始。

好的，我可以为您提供一个简单的贪吃蛇游戏示例，代码如下：

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.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;

    public static final int WIDTH = 300;
    public static final int HEIGHT = 300;

    private Thread thread;
    private boolean running = false;

    private BodyPart b;
    private ArrayList<BodyPart> snake;

    private Egg egg;
    private ArrayList<Egg> eggs;

    private Random r;

    private int xCoor = 10, yCoor = 10;
    private int size = 5;

    private boolean right = true, left = false, up = false, down = false;

    private int ticks = 0;

    private Key key;

    private int score = 0;

    public SnakeGame() {
        setFocusable(true);

        key = new Key();
        addKeyListener(this);
    }

    public void paint(Graphics g) {
        g.clearRect(0, 0, WIDTH, HEIGHT);

        g.setColor(Color.BLACK);
        g.fillRect(0, 0, WIDTH, HEIGHT);

        for (int i = 0; i < WIDTH / 10; i++) {
            g.drawLine(i * 10, 0, i * 10, HEIGHT);
        }

        for (int i = 0; i < HEIGHT / 10; i++) {
            g.drawLine(0, i * 10, WIDTH, i * 10);
        }

        for (int i = 0; i < snake.size(); i++) {
            snake.get(i).draw(g);
        }

        for (int i = 0; i < eggs.size(); i++) {
            eggs.get(i).draw(g);
        }
    }

    public void start() {
        running = true;
        thread = new Thread(this);
        thread.start();
    }

    public void stop() {
        running = false;
        try {
            thread.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    public void run() {
        snake = new ArrayList<BodyPart>();
        eggs = new ArrayList<Egg>();
        r = new Random();

        addEgg();

        while (running) {
            tick();
            repaint();
        }
    }

    public void tick() {
        if (snake.size() == 0) {
            b = new BodyPart(xCoor, yCoor, 10);
            snake.add(b);
        }

        ticks++;

        if (ticks > 1500000) {
            if (right)
                xCoor++;

            if (left)
                xCoor--;

            if (up)
                yCoor--;

            if (down)
                yCoor++;

            ticks = 0;

            b = new BodyPart(xCoor, yCoor, 10);
            snake.add(b);

            if (snake.size() > size) {
                snake.remove(0);
            }
        }

        if (eggs.size() == 0) {
            addEgg();
        }

        for (int i = 0; i < eggs.size(); i++) {
            if (xCoor == eggs.get(i).getxCoor() && yCoor == eggs.get(i).getyCoor()) {
                size++;
                score += 100;
                eggs.remove(i);
                i--;
            }
        }

        for (int i = 0; i < snake.size(); i++) {
            if (xCoor == snake.get(i).getxCoor() && yCoor == snake.get(i).getyCoor()) {
                if (i != snake.size() - 1) {
                    stop();
                }
            }
        }

        if (xCoor < 0 || xCoor > 29 || yCoor < 0 || yCoor > 29) {
            stop();
        }
    }

    public void addEgg() {
        int x = r.nextInt(30);
        int y = r.nextInt(30);

        egg = new Egg(x, y, 10);
        eggs.add(egg);
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        SnakeGame game = new SnakeGame();

        frame.add(game);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setTitle("Snake Game");
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);

        game.start();
    }

    public void keyPressed(KeyEvent e) {
        int key = e.getKeyCode();

        if (key == KeyEvent.VK_RIGHT && !left) {
            up = false;
            down = false;
            right = true;
        }

        if (key == KeyEvent.VK_LEFT && !right) {
            up = false;
            down = false;
            left = true;
        }

        if (key == KeyEvent.VK_UP && !down) {
            left = false;
            right = false;
            up = true;
        }

        if (key == KeyEvent.VK_DOWN && !up) {
            left = false;
            right = false;
            down = true;
        }

        if (key == KeyEvent.VK_ENTER) {
            if (!running) {
                running = true;
                new Thread(this).start();
            }
        }

        if (key == KeyEvent.VK_SPACE) {
            if (running) {
                running = false;
            } else {
                running = true;
                new Thread(this).start();
            }
        }
    }

    public void keyReleased(KeyEvent e) {
    }

    public void keyTyped(KeyEvent e) {
    }
}

class BodyPart {
    private int xCoor, yCoor, width, height;

    public BodyPart(int xCoor, int yCoor, int size) {
        this.xCoor = xCoor;
        this.yCoor = yCoor;
        width = size;
        height = size;
    }

    public void draw(Graphics g) {
        g.setColor(Color.WHITE);
        g.fillRect(xCoor * width, yCoor * height, width, height);
    }

    public int getxCoor() {
        return xCoor;
    }

    public void setxCoor(int xCoor) {
        this.xCoor = xCoor;
    }

    public int getyCoor() {
        return yCoor;
    }

    public void setyCoor(int yCoor) {
        this.yCoor = yCoor;
    }
}

class Egg {
    private int xCoor, yCoor, width, height;

    public Egg(int xCoor, int yCoor, int size) {
        this.xCoor = xCoor;
        this.yCoor = yCoor;
        width = size;
        height = size;
    }

    public void draw(Graphics g) {
        g.setColor(Color.RED);
        g.fillOval(xCoor * width, yCoor * height, width, height);
    }

    public int getxCoor() {
        return xCoor;
    }

    public int getyCoor() {
        return yCoor;
    }
}

class Key {
    public boolean[] keys = new boolean[256];

    public boolean up, down, left, right;

    public void update() {
        up = keys[KeyEvent.VK_UP];
        down = keys[KeyEvent.VK_DOWN];
        left = keys[KeyEvent.VK_LEFT];
        right = keys[KeyEvent.VK_RIGHT];
    }

    public void keyPressed(KeyEvent e) {
        keys[e.getKeyCode()] = true;
    }

    public void keyReleased(KeyEvent e) {
        keys[e.getKeyCode()] = false;
    }
}

这个示例中有一些基本功能实现，如蛇的移动、蛋的随机生成、蛇的长度增加、死亡判定、计分、暂停等。您可以根据自己的需求进行修改和完善。