java实现不同大小交互界面的贪吃蛇

以下是一个简单的Java实现不同大小交互界面的贪吃蛇游戏：

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

public class Snake extends JFrame implements ActionListener, KeyListener {
    private final int WIDTH = 600;
    private final int HEIGHT = 600;
    private final int UNIT_SIZE = 20;
    private final int GAME_UNITS = (WIDTH * HEIGHT) / UNIT_SIZE;
    private final int DELAY = 80;

    private int[] x = new int[GAME_UNITS];
    private int[] y = new int[GAME_UNITS];
    private int bodyParts = 3;
    private int applesEaten = 0;
    private int appleX;
    private int appleY;
    private char direction = 'R';
    private boolean running = false;
    private Timer timer;
    private Random random;

    public Snake() {
        setTitle("Snake Game");
        setSize(WIDTH, HEIGHT);
        setResizable(false);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        addKeyListener(this);
        random = new Random();
        initGame();
        setVisible(true);
    }

    private void initGame() {
        running = true;
        newApple();
        timer = new Timer(DELAY, this);
        timer.start();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (running) {
            move();
            checkApple();
            checkCollisions();
        }
        repaint();
    }

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

    private void checkApple() {
        if (x[0] == appleX && y[0] == appleY) {
            bodyParts++;
            applesEaten++;
            newApple();
        }
    }

    private void checkCollisions() {
        // check if head collides with body
        for (int i = bodyParts; i > 0; i--) {
            if (x[0] == x[i] && y[0] == y[i]) {
                running = false;
            }
        }
        // check if head touches left border
        if (x[0] < 0) {
            running = false;
        }
        // check if head touches right border
        if (x[0] > WIDTH) {
            running = false;
        }
        // check if head touches top border
        if (y[0] < 0) {
            running = false;
        }
        // check if head touches bottom border
        if (y[0] > HEIGHT) {
            running = false;
        }
        if (!running) {
            timer.stop();
        }
    }

    private void newApple() {
        appleX = random.nextInt((int) (WIDTH / UNIT_SIZE)) * UNIT_SIZE;
        appleY = random.nextInt((int) (HEIGHT / UNIT_SIZE)) * UNIT_SIZE;
    }

    @Override
    public void paint(Graphics g) {
        // draw grid
        for (int i = 0; i < WIDTH / UNIT_SIZE; i++) {
            g.drawLine(i * UNIT_SIZE, 0, i * UNIT_SIZE, HEIGHT);
            g.drawLine(0, i * UNIT_SIZE, WIDTH, i * UNIT_SIZE);
        }
        // draw apple
        g.setColor(Color.red);
        g.fillOval(appleX, appleY, UNIT_SIZE, UNIT_SIZE);
        // draw snake
        for (int i = 0; i < bodyParts; i++) {
            if (i == 0) {
                g.setColor(Color.green);
            } else {
                g.setColor(new Color(45, 180, 0));
            }
            g.fillRect(x[i], y[i], UNIT_SIZE, UNIT_SIZE);
        }
        // game over message
        if (!running) {
            g.setColor(Color.red);
            g.setFont(new Font("Ink Free", Font.BOLD, 40));
            FontMetrics metrics = getFontMetrics(g.getFont());
            g.drawString("Game Over", (WIDTH - metrics.stringWidth("Game Over")) / 2, HEIGHT / 2);
        }
        // score message
        g.setColor(Color.white);
        g.setFont(new Font("Ink Free", Font.BOLD, 20));
        FontMetrics metrics = getFontMetrics(g.getFont());
        g.drawString("Score: " + applesEaten, (WIDTH - metrics.stringWidth("Score: " + applesEaten)) / 2, g.getFont().getSize());
    }

    @Override
    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;
        }
    }

    @Override
    public void keyTyped(KeyEvent e) {}

    @Override
    public void keyReleased(KeyEvent e) {}
    
    public static void main(String[] args) {
        new Snake();
    }
}

这个游戏使用了Java的Swing库来创建交互界面，利用键盘监听器来控制蛇的运动方向。游戏会在窗口中绘制蛇、苹果和网格，并在游戏结束时显示得分和游戏结束信息。