使用Java写贪吃蛇小游戏

好的，下面是一个简单的 Java 代码实现贪吃蛇小游戏的示例：

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

public class SnakeGame extends JFrame implements KeyListener, ActionListener {
    private int width = 300;
    private int height = 300;
    private int size = 10;
    private int x = width / size / 2 * size;
    private int y = height / size / 2 * size;
    private int fx = (int)(Math.random() * (width / size)) * size;
    private int fy = (int)(Math.random() * (height / size)) * size;
    private int score = 0;
    private int dir = KeyEvent.VK_RIGHT;
    private Timer timer = new Timer(100, this);
    private boolean running = true;
    private boolean[][] map = new boolean[width / size][height / size];

    public SnakeGame() {
        setTitle("Snake Game");
        setSize(width, height);
        setResizable(false);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        addKeyListener(this);
        setVisible(true);
        timer.start();
    }

    public void paint(Graphics g) {
        super.paint(g);
        g.setColor(Color.RED);
        g.fillRect(fx, fy, size, size);
        g.setColor(Color.BLACK);
        for (int i = 0; i < width / size; i++) {
            for (int j = 0; j < height / size; j++) {
                if (map[i][j]) {
                    g.fillRect(i * size, j * size, size, size);
                }
            }
        }
        g.setColor(Color.BLUE);
        g.drawString("Score: " + score, 10, 20);
    }

    public void keyPressed(KeyEvent e) {
        int key = e.getKeyCode();
        if (key == KeyEvent.VK_LEFT && dir != KeyEvent.VK_RIGHT) {
            dir = key;
        }
        if (key == KeyEvent.VK_UP && dir != KeyEvent.VK_DOWN) {
            dir = key;
        }
        if (key == KeyEvent.VK_RIGHT && dir != KeyEvent.VK_LEFT) {
            dir = key;
        }
        if (key == KeyEvent.VK_DOWN && dir != KeyEvent.VK_UP) {
            dir = key;
        }
    }

    public void actionPerformed(ActionEvent e) {
        if (!running) {
            return;
        }
        switch (dir) {
            case KeyEvent.VK_LEFT:
                x -= size;
                break;
            case KeyEvent.VK_UP:
                y -= size;
                break;
            case KeyEvent.VK_RIGHT:
                x += size;
                break;
            case KeyEvent.VK_DOWN:
                y += size;
                break;
        }
        if (x < 0 || x >= width || y < 0 || y >= height) {
            running = false;
            JOptionPane.showMessageDialog(this, "Game Over!");
            return;
        }
        if (x == fx && y == fy) {
            score++;
            fx = (int)(Math.random() * (width / size)) * size;
            fy = (int)(Math.random() * (height / size)) * size;
        } else {
            map[x / size][y / size] = true;
            map[(x - dir % 2 * 2 + dir % 4 - 1) / size][(y - dir % 2 * 2 + dir % 4 - 1) / size] = false;
        }
        repaint();
    }

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

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

这个示例代码实现了一个基本的贪吃蛇小游戏，玩家可以通过方向键来控制贪吃蛇的移动方向，吃到食物会增加分数，撞到墙壁或自己身体会游戏结束。