java 课程设计 贪吃蛇

以下是一个简单的Java贪吃蛇游戏的示例代码：

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

public class SnakeGame extends JFrame implements KeyListener {
    private static final int WIDTH = 400;
    private static final int HEIGHT = 400;    private static final int UNIT_SIZE = 20;
    private static final int GAME_UNITS = (WIDTH * HEIGHT) / (UNIT_SIZE * UNIT_SIZE);
    private static final int DELAY = 75;

    private final int[] x = new int[GAME_UNITS];
    private final int[] y = new int[GAME_UNITS];
    private int bodyParts = 6;
    private int applesEaten;
    private int appleX;
    private int appleY;
    private char direction = 'R';
    private boolean running = false;
    private Timer timer;

    public SnakeGame() {
        setTitle("Snake Game");
        setSize(WIDTH, HEIGHT);
        setResizable(false);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
        addKeyListener(this);
        startGame();
    }

    public void startGame() {
        newApple();
        running = true;
        timer = new Timer(DELAY, new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                if (running) {
                    move();
                    checkApple();
                    checkCollisions();
                    repaint();
                }
            }
        });
        timer.start();
    }

    public void paint(Graphics g) {
        // 绘制背景
        g.setColor(Color.black);
        g.fillRect(0, 0, WIDTH, HEIGHT);

        // 绘制苹果
        g.setColor(Color.red);
        g.fillOval(appleX, appleY, UNIT_SIZE, UNIT_SIZE);

        // 绘制蛇身体
        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);
        }
    }

    public 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] = y[0] - UNIT_SIZE;
                break;
            case 'D':
                y[0] = y[0] + UNIT_SIZE;
                break;
            case 'L':
                x[0] = x[0] - UNIT_SIZE;
                break;
            case 'R':
                x[0] = x[0] + UNIT_SIZE;
                break;
        }
    }

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

    public void checkCollisions() {
        // 检查是否碰到自身
        for (int i = bodyParts; i > 0; i--) {
            if ((x[0] == x[i]) && (y[0] == y[i])) {
                running = false;
            }
        }

        // 检查是否碰到边界
        if (x[0] < 0 || x[0] >= WIDTH || y[0] < 0 || y[0] >= HEIGHT) {
            running = false;
        }

        if (!running) {
            timer.stop();
        }
    }

    public void newApple() {
        Random random = new Random();
        appleX = random.nextInt((WIDTH / UNIT_SIZE)) * UNIT_SIZE;
        appleY = random.nextInt((HEIGHT / UNIT_SIZE)) * UNIT_SIZE;
    }

    public void keyPressed(KeyEvent e) {
        switch (e.getKeyCode()) {
            case KeyEvent.VK_UP:
                if (direction != 'D') {
                    direction = 'U';                }
                break;
            case KeyEvent.VK_DOWN:
                if (direction != 'U') {
                    direction = 'D';
                }
                break;
            case KeyEvent.VK_LEFT:
                if (direction != 'R') {
                    direction = 'L';
                }
                break;
            case KeyEvent.VK_RIGHT:
                if (direction != 'L') {
                    direction = 'R';
                }
                break;
        }
    }

    public void keyTyped(KeyEvent e) {}

    public void keyReleased(KeyEvent e) {}

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