下面的代码把紫色边框改成一圈的紫色方格并给全代码import javaxswing;import javaawt;import javaawteventKeyEvent;import javaawteventKeyListener;import javautilArrayList;import javautilRandom;public class SnakeGame extends JFrame

import javax.swing.; import java.awt.; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import java.util.ArrayList; import java.util.Random;

public class SnakeGame extends JFrame implements KeyListener { // 游戏界面大小 private final int WIDTH = 800; private final int HEIGHT = 800; // 网格大小 private static final int GRID_SIZE = 40; // 贪吃蛇移动速度 private static final int SNAKE_SPEED = GRID_SIZE; // 贪吃蛇 private ArrayList snake = new ArrayList<>(); private Point direction = new Point(1, 0); // 贪吃蛇移动方向 private Point food; // 食物 // 记录玩家得分 private int score = 0;

public SnakeGame() {
    // 设置窗口大小和标题
    setSize(WIDTH, HEIGHT);
    setTitle("贪吃蛇小游戏");
    // 设置窗口居中
    setLocationRelativeTo(null);
    // 添加键盘监听器
    addKeyListener(this);
    // 初始化贪吃蛇和食物
    initSnake();
    initFood();
    // 显示窗口
    setVisible(true);
}

// 初始化贪吃蛇
private void initSnake() {
    // 初始长度为3
    snake.add(new Point(2, 0));
    snake.add(new Point(1, 0));
    snake.add(new Point(0, 0));
}

// 初始化食物
private void initFood() {
    Random random = new Random();
    int x = random.nextInt(WIDTH / GRID_SIZE);
    int y = random.nextInt(HEIGHT / GRID_SIZE);
    food = new Point(x, y);
    // 每次生成新的食物时，将 score 的值加上 10
    score += 10;
}

// 绘制游戏界面
@Override
public void paint(Graphics g) {
    // 清空画布
    g.clearRect(0, 0, WIDTH, HEIGHT);
    // 绘制紫色方格边框
    g.setColor(Color.PINK);
    for (int i = 0; i < WIDTH / GRID_SIZE; i++) {
        for (int j = 0; j < HEIGHT / GRID_SIZE; j++) {
            g.drawRect(i * GRID_SIZE, j * GRID_SIZE, GRID_SIZE, GRID_SIZE);
        }
    }
    // 绘制网格
    g.setColor(Color.GRAY);
    for (int i = 0; i < WIDTH / GRID_SIZE; i++) {
        g.drawLine(i * GRID_SIZE, 0, i * GRID_SIZE, HEIGHT);
    }
    for (int i = 0; i < HEIGHT / GRID_SIZE; i++) {
        g.drawLine(0, i * GRID_SIZE, WIDTH, i * GRID_SIZE);
    }
    // 绘制贪吃蛇
    g.setColor(Color.GREEN);
    for (Point p : snake) {
        g.fillRect(p.x * GRID_SIZE, p.y * GRID_SIZE, GRID_SIZE, GRID_SIZE);
    }
    // 绘制食物
    g.setColor(Color.RED);
    g.fillOval(food.x * GRID_SIZE, food.y * GRID_SIZE, GRID_SIZE, GRID_SIZE);
    // 显示得分
    g.setColor(Color.GREEN);
    g.setFont(new Font("微软雅黑", Font.PLAIN, 20));
    g.drawString("得分：" + score, 650, 100);
}

// 重写 update() 方法，调用 paint() 方法
@Override
public void update(Graphics g) {
    paint(g);
}

// 贪吃蛇移动
private void moveSnake() {
    // 计算新的蛇头位置
    Point head = new Point(snake.get(0).x + direction.x, snake.get(0).y + direction.y);
    // 判断是否撞墙
    if (head.x < 0 || head.x >= WIDTH / GRID_SIZE || head.y < 0 || head.y >= HEIGHT / GRID_SIZE) {
        JOptionPane.showMessageDialog(this, "你是真的菜");
        System.exit(0);
    }
    // 判断蛇头是否与蛇身相撞
    for (int i = 1; i < snake.size(); i++) {
        if (head.equals(snake.get(i))) {
            JOptionPane.showMessageDialog(this, "你是真的菜");
            System.exit(0);
        }
    }
    // 判断是否吃到食物
    if (head.equals(food)) {
        snake.add(0, head);
        initFood();
        // 如果吃到食物，则将 score 的值加上 10
        score += 10;
    } else {
        snake.add(0, head);
        snake.remove(snake.size() - 1);
    }
    // 刷新游戏界面
    repaint();
}

// 键盘按下事件处理
@Override
public void keyPressed(KeyEvent e) {
    switch (e.getKeyCode()) {
        case KeyEvent.VK_UP:
            if (direction.y != 1) {
                direction.x = 0;
                direction.y = -1;
            }
            break;
        case KeyEvent.VK_DOWN:
            if (direction.y != -1) {
                direction.x = 0;
                direction.y = 1;
            }
            break;
        case KeyEvent.VK_LEFT:
            if (direction.x != 1) {
                direction.x = -1;
                direction.y = 0;
            }
            break;
        case KeyEvent.VK_RIGHT:
            if (direction.x != -1) {
                direction.x = 1;
                direction.y = 0;
            }
            break;
    }
}

// 必须实现的方法
@Override
public void keyTyped(KeyEvent e) {
}

// 必须实现的方法
@Override
public void keyReleased(KeyEvent e) {
}

public static void main(String[] args) {
    SnakeGame game = new SnakeGame();
    // 游戏循环
    while (true) {
        game.moveSnake();
        try {
            Thread.sleep(8000 / SNAKE_SPEED);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}