基础版本

JAVA练习小游戏——贪吃蛇小游戏_timberman666的博客-CSDN博客https://blog.csdn.net/timberman666/article/details/131046742?spm=1001.2014.3001.5501

新增内容

1.添加START开始界面

点击空格Space即刻开始游戏

2.新增背景音乐

从游戏开始即可尽享音乐直至游戏结束

3.添加SCORE计分

对贪吃蛇吃掉苹果计入分数

4.新增游戏机制

在贪吃蛇超出界面死亡机制基础上增加贪吃蛇首尾相遇也会判定死亡

代码实现

import java.awt.*;
import java.awt.event.*;
import java.awt.font.TextLayout;
import javax.swing.*;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;
import java.io.File;
import java.io.IOException;
import java.net.URL;

public class SnakeGame extends JFrame implements ActionListener {

    private static final long serialVersionUID = 1L;
    private boolean gameStarted = false;
    // 定义游戏区域的大小
    private final int WIDTH = 640;
    private final int HEIGHT = 640;

    // 定义贪吃蛇的初始位置和大小
    private final int DOT_SIZE = 10;
    private final int ALL_DOTS = 900;
    private final int RAND_POS = 30;
    private int[] x = new int[ALL_DOTS];
    private int[] y = new int[ALL_DOTS];
    private int dots;
    private int apple_x;
    private int apple_y;
    private int score = 0;

    // 定义贪吃蛇的移动方向
    private boolean leftDirection = false;
    private boolean rightDirection = true;
    private boolean upDirection = false;
    private boolean downDirection = false;

    // 定义游戏是否结束
    private boolean inGame = true;

    // 定义计时器
    private Timer timer;


    private void loadAudio() {
        try {
            String temp="C:/Users/timberman/Desktop/disco.wav";
            AudioInputStream audioIn = AudioSystem.getAudioInputStream(new File(temp));
            Clip clip = AudioSystem.getClip();
            clip.open(audioIn);
            clip.loop(Clip.LOOP_CONTINUOUSLY);
        } catch (UnsupportedAudioFileException | IOException | LineUnavailableException e) {
            e.printStackTrace();
        } catch (NullPointerException e) {
            System.err.println("Error: audio file not found or could not be loaded.");
        }
    }
    public SnakeGame() {
        initGame();
        addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent e) {
                int key = e.getKeyCode();
                if (key == KeyEvent.VK_LEFT && !rightDirection) {
                    leftDirection = true;
                    upDirection = false;
                    downDirection = false;
                } else if (key == KeyEvent.VK_RIGHT && !leftDirection) {
                    rightDirection = true;
                    upDirection = false;
                    downDirection = false;
                } else if (key == KeyEvent.VK_UP && !downDirection) {
                    upDirection = true;
                    leftDirection = false;
                    rightDirection = false;
                } else if (key == KeyEvent.VK_DOWN && !upDirection) {
                    downDirection = true;
                    leftDirection = false;
                    rightDirection = false;
                }
            }
        });
        setFocusable(true);
    }

    public void initGame() {
        loadAudio();
        // Initialize game area
        setTitle("SnakeGame");
        setSize(WIDTH, HEIGHT);
        setResizable(false);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
        getContentPane().setBackground(Color.black);

        // Add start screen
        JLabel startLabel = new JLabel("Press the space bar to start the game");
        startLabel.setForeground(Color.white);
        startLabel.setBackground(Color.black);
        startLabel.setFont(new Font("Helvetica", Font.BOLD, 20));
        startLabel.setHorizontalAlignment(JLabel.CENTER);
        startLabel.setVerticalAlignment(JLabel.CENTER);
        add(startLabel);

        // Initialize snake and apple positions
        dots = 3;
        for (int i = 0; i < dots; i++) {
            x[i] = 50 - i * DOT_SIZE;
            y[i] = 50;
        }
        locateApple();

        // Initialize timer
        timer = new Timer(140, this);

        // Add key listener to start game
        addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent e) {
                int key = e.getKeyCode();
                if (key == KeyEvent.VK_SPACE && !gameStarted) {
                    // Remove start screen
                    remove(startLabel);
                    gameStarted = true;
                    // Start timer
                    timer.start();
                }
            }
        });

        score = 0;
    }

    public void locateApple() {
        // 随机生成苹果的位置
        int r = (int) (Math.random() * RAND_POS);
        apple_x = r * DOT_SIZE;

        r = (int) (Math.random() * (RAND_POS/2)); // limit apple to top half of game area
        apple_y = r * DOT_SIZE;
    }
    public void checkApple() {
        // 检查贪吃蛇是否吃到了苹果
        if ((x[0] == apple_x) && (y[0] == apple_y)) {
            dots++;
            locateApple();
            score++;
            setTitle("SnakeGame - Score: " + score);
        }
    }

    public void checkCollision() {
        // 检查贪吃蛇是否碰到了边界或自己的身体
        for (int i = dots; i > 0; i--) {
            if ((i > 4) && (x[0] == x[i]) && (y[0] == y[i])) {
                inGame = false;
            }
        }

        if (y[0] >= HEIGHT) {
            inGame = false;
        }

        if (y[0] < 0) {
            inGame = false;
        }

        if (x[0] >= WIDTH) {
            inGame = false;
        }

        if (x[0] < 0) {
            inGame = false;
        }

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

    public void move() {
        // 移动贪吃蛇
        for (int i = dots; i > 0; i--) {
            x[i] = x[(i - 1)];
            y[i] = y[(i - 1)];
        }

        if (leftDirection) {
            x[0] -= DOT_SIZE;
        }

        if (rightDirection) {
            x[0] += DOT_SIZE;
        }

        if (upDirection) {
            y[0] -= DOT_SIZE;
        }

        if (downDirection) {
            y[0] += DOT_SIZE;
        }
    }

    public void actionPerformed(ActionEvent e) {
        // 计时器触发事件
        if (inGame) {
            checkApple();
            checkCollision();
            move();
            repaint(); // 重绘游戏区域
        }
    }

    public void paint(Graphics g) {

        // 绘制游戏区域
        super.paint(g);

        if (inGame) {
            g.setColor(Color.red);
            g.fillOval(apple_x, apple_y, DOT_SIZE, DOT_SIZE);

            for (int i = 0; i < dots; i++) {
                g.setColor(Color.green);
                g.fillRect(x[i], y[i], DOT_SIZE, DOT_SIZE);
            }
            g.setColor(Color.black);
            Toolkit.getDefaultToolkit().sync();
        } else {
            gameOver(g);
        }
    }

    public void gameOver(Graphics g) {
        // 游戏结束
        String msg = "GAME OVER";
        Font small = new Font("Helvetica", Font.BOLD, 40);
        FontMetrics metr = getFontMetrics(small);

        g.setColor(Color.white);
        g.setFont(small);
        g.drawString(msg, (WIDTH - metr.stringWidth(msg)) / 2, HEIGHT / 2);

        String scoreMsg = "Final Score: " + score;
        Font smallScore = new Font("Helvetica", Font.BOLD, 20);
        FontMetrics scoreMetr = getFontMetrics(smallScore);
        g.setFont(smallScore);
        g.drawString(scoreMsg, (WIDTH - scoreMetr.stringWidth(scoreMsg)) / 2, HEIGHT / 2 + 50);

    }


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