用Java制作一个贪吃蛇游戏

好的，下面我给你提供一份简单的 Java 贪吃蛇游戏代码，希望能帮助到你：

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

public class SnakeGame extends JFrame implements ActionListener {
    private final int SIZE = 20;
    private final int WIDTH = 20;
    private final int HEIGHT = 20;
    private final int DOT_SIZE = 10;
    private final int ALL_DOTS = 900;
    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 boolean leftDirection = false;
    private boolean rightDirection = true;
    private boolean upDirection = false;
    private boolean downDirection = false;
    private boolean inGame = true;
    private Timer timer;

    public SnakeGame() {
        setTitle("贪吃蛇游戏");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(SIZE * WIDTH, SIZE * HEIGHT);
        setResizable(false);
        setLocationRelativeTo(null);
        setVisible(true);
        addKeyListener(new TAdapter());
        initGame();
    }

    public void initGame() {
        dots = 3;
        for (int i = 0; i < dots; i++) {
            x[i] = 50 - i * 10;
            y[i] = 50;
        }
        locateApple();
        timer = new Timer(140, this);
        timer.start();
    }

    public void checkApple() {
        if ((x[0] == apple_x) && (y[0] == apple_y)) {
            dots++;
            locateApple();
        }
    }

    public void locateApple() {
        int r = new Random().nextInt(SIZE);
        apple_x = r * DOT_SIZE;
        r = new Random().nextInt(SIZE);
        apple_y = r * DOT_SIZE;
    }

    public void checkCollision() {
        for (int i = dots; i > 0; i--) {
            if ((i > 4) && (x[0] == x[i]) && (y[0] == y[i])) {
                inGame = false;
            }
        }
        if (y[0] >= HEIGHT * DOT_SIZE) {
            inGame = false;
        }
        if (y[0] < 0) {
            inGame = false;
        }
        if (x[0] >= WIDTH * DOT_SIZE) {
            inGame = false;
        }
        if (x[0] < 0) {
            inGame = false;
        }
        if (!inGame) {
            timer.stop();
        }
    }

    public void move() {
        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 paint(Graphics g) {
        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++) {
                if (i == 0) {
                    g.setColor(Color.green);
                    g.fillRect(x[i], y[i], DOT_SIZE, DOT_SIZE);
                } else {
                    g.setColor(Color.yellow);
                    g.fillRect(x[i], y[i], DOT_SIZE, DOT_SIZE);
                }
            }
            Toolkit.getDefaultToolkit().sync();
        } else {
            gameOver(g);
        }
    }

    public void gameOver(Graphics g) {
        String msg = "Game Over";
        Font small = new Font("Helvetica", Font.BOLD, 14);
        FontMetrics metr = getFontMetrics(small);
        g.setColor(Color.white);
        g.setFont(small);
        g.drawString(msg, (WIDTH * SIZE - metr.stringWidth(msg)) / 2, HEIGHT * SIZE / 2);
    }

    public void actionPerformed(ActionEvent e) {
        if (inGame) {
            checkApple();
            checkCollision();
            move();
        }
        repaint();
    }

    private class TAdapter extends KeyAdapter {
        public void keyPressed(KeyEvent e) {
            int key = e.getKeyCode();
            if ((key == KeyEvent.VK_LEFT) && (!rightDirection)) {
                leftDirection = true;
                upDirection = false;
                downDirection = false;
            }
            if ((key == KeyEvent.VK_RIGHT) && (!leftDirection)) {
                rightDirection = true;
                upDirection = false;
                downDirection = false;
            }
            if ((key == KeyEvent.VK_UP) && (!downDirection)) {
                upDirection = true;
                rightDirection = false;
                leftDirection = false;
            }
            if ((key == KeyEvent.VK_DOWN) && (!upDirection)) {
                downDirection = true;
                rightDirection = false;
                leftDirection = false;
            }
        }
    }

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

这份代码中，我们使用了 Java 的 Swing 图形库来实现 GUI 界面，使用了计时器来控制游戏的刷新频率。在游戏中，贪吃蛇的身体由一系列方格组成，我们定义了四个方向变量来控制贪吃蛇的移动方向，使用键盘监听器来监听用户输入，实现贪吃蛇的控制。同时，我们在游戏中添加了随机生成苹果的功能，当贪吃蛇吃到苹果时，贪吃蛇的身体长度会增加。在游戏过程中，我们对贪吃蛇与边界以及自身碰撞进行了检测，当贪吃蛇出现碰撞时，游戏结束，弹出游戏结束的提示框。