snakegame java代码

### 回答1：
贪吃蛇游戏（Snake Game）是一种经典的视频游戏。下面是一个简单的Java代码示例，实现了贪吃蛇游戏的基本功能：

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

public class SnakeGame extends JFrame {
    private static final long serialVersionUID = 1L;
    private Board board;

    public SnakeGame() {
        setTitle("Snake Game");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        board = new Board();
        getContentPane().add(board);
        pack();
        setLocationRelativeTo(null);
        setResizable(false);
        setVisible(true);
    }

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

class Board extends JPanel implements ActionListener {
    private static final long serialVersionUID = 1L;
    private static final int WIDTH = 300;
    private static final int HEIGHT = 300;
    private static final int DOT_SIZE = 10;
    private static final int ALL_DOTS = 900;
    private static final int RAND_POS = 29;
    private static final int DELAY = 140;

    private final int[] x = new int[ALL_DOTS];
    private final int[] y = new int[ALL_DOTS];

    private int dots;
    private int apple_x;
    private int apple_y;

    private boolean leftDirection;
    private boolean rightDirection = true;
    private boolean upDirection;
    private boolean downDirection;
    private boolean inGame = true;

    private Timer timer;

    public Board() {
        initBoard();
    }

    private void initBoard() {
        setBackground(Color.black);
        setFocusable(true);

        setPreferredSize(new Dimension(WIDTH, HEIGHT));
        addKeyListener(new TAdapter());

        startGame();
    }

    private void startGame() {
        dots = 3;

        for (int z = 0; z < dots; z++) {
            x[z] = 50 - z * DOT_SIZE;
            y[z] = 50;
        }

        locateApple();

        timer = new Timer(DELAY, this);
        timer.start();
    }

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);

        doDrawing(g);
    }

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

            for (int z = 0; z < dots; z++) {
                if (z == 0) {
                    g.setColor(Color.green);
                    g.fillRect(x[z], y[z], DOT_SIZE, DOT_SIZE);
                } else {
                    g.setColor(Color.white);
                    g.fillRect(x[z], y[z], DOT_SIZE, DOT_SIZE);
                }
            }

            Toolkit.getDefaultToolkit().sync();

        } else {
            gameOver(g);
        }
    }

    private 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 - metr.stringWidth(msg)) / 2, HEIGHT / 2);
    }

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

    private void move() {
        for (int z = dots; z > 0; z--) {
            x[z] = x[(z - 1)];
            y[z] = y[(z - 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;
        }
    }

    private void checkCollision() {
        for (int z = dots; z > 0; z--) {
            if ((z > 4) && (x[0] == x[z]) && (y[0] == y[z])) {
                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();
        }
    }

    private void locateApple() {
        int r = (int) (Math.random() * RAND_POS);
        apple_x = ((r * DOT_SIZE));

        r = (int) (Math.random() * RAND_POS);
        apple_y = ((r * DOT_SIZE));
    }

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

        repaint();
    }

    private class TAdapter extends KeyAdapter {
        @Override
        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;
            }
        }
    }
}

这是一个简单的贪吃蛇游戏实现。游戏面板使用`JPanel`进行绘制，通过监听键盘事件控制蛇的移动方向。游戏中，蛇每次吃到食物会变长，如果蛇头碰撞到自己或者碰到边界，则游戏结束。游戏画面使用基本的图形绘制，包括蛇身和食物，使用`Timer`控制游戏速度。

### 回答2：
以下是一个简单的贪吃蛇游戏的Java代码：

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

public class SnakeGame extends JPanel {
    private final int BOX_SIZE = 10;
    private final int NUM_BOXES = 400;
    private final int GAME_SPEED = 100;

    private int[] snakeX;
    private int[] snakeY;
    private int snakeSize;
    private int directionX;
    private int directionY;
    private int foodX;
    private int foodY;
    private boolean isGameOver;

    public SnakeGame() {
        setPreferredSize(new Dimension(400, 400));
        setBackground(Color.BLACK);
        setFocusable(true);

        addKeyListener(new SnakeKeyListener());

        snakeX = new int[NUM_BOXES];
        snakeY = new int[NUM_BOXES];
        snakeSize = 3;

        directionX = 1;
        directionY = 0;

        spawnFood();

        Timer gameTimer = new Timer(GAME_SPEED, new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                if (!isGameOver) {
                    moveSnake();
                    checkCollision();
                    repaint();
                } else {
                    ((Timer) e.getSource()).stop();
                }
            }
        });
        gameTimer.start();
    }

    protected void paintComponent(Graphics g) {
        super.paintComponent(g);

        if (!isGameOver) {
            // 画蛇头
            g.setColor(Color.GREEN);
            g.fillRect(snakeX[0], snakeY[0], BOX_SIZE, BOX_SIZE);

            // 画蛇身
            g.setColor(Color.WHITE);
            for (int i = 1; i < snakeSize; i++) {
                g.fillRect(snakeX[i], snakeY[i], BOX_SIZE, BOX_SIZE);
            }

            // 画食物
            g.setColor(Color.RED);
            g.fillRect(foodX, foodY, BOX_SIZE, BOX_SIZE);
        } else {
            // 游戏结束
            g.setColor(Color.WHITE);
            g.setFont(new Font("Arial", Font.BOLD, 20));
            g.drawString("Game Over", 150, 200);
        }
    }

    private void moveSnake() {
        for (int i = snakeSize - 1; i > 0; i--) {
            snakeX[i] = snakeX[i - 1];
            snakeY[i] = snakeY[i - 1];
        }

        snakeX[0] += directionX * BOX_SIZE;
        snakeY[0] += directionY * BOX_SIZE;
    }

    private void checkCollision() {
        // 检查碰撞边界
        if (snakeX[0] < 0 || snakeX[0] >= getWidth() || snakeY[0] < 0 || snakeY[0] >= getHeight()) {
            isGameOver = true;
            return;
        }

        // 检查碰撞自身
        for (int i = 1; i < snakeSize; i++) {
            if (snakeX[0] == snakeX[i] && snakeY[0] == snakeY[i]) {
                isGameOver = true;
                return;
            }
        }

        // 检查是否吃到食物
        if (snakeX[0] == foodX && snakeY[0] == foodY) {
            snakeSize++;
            spawnFood();
        }
    }

    private void spawnFood() {
        foodX = (int) (Math.random() * (getWidth() / BOX_SIZE)) * BOX_SIZE;
        foodY = (int) (Math.random() * (getHeight() / BOX_SIZE)) * BOX_SIZE;
    }

    private class SnakeKeyListener extends KeyAdapter {
        public void keyPressed(KeyEvent e) {
            int keyCode = e.getKeyCode();

            switch (keyCode) {
                case KeyEvent.VK_UP:
                    if (directionY != 1) {
                        directionX = 0;
                        directionY = -1;
                    }
                    break;
                case KeyEvent.VK_DOWN:
                    if (directionY != -1) {
                        directionX = 0;
                        directionY = 1;
                    }
                    break;
                case KeyEvent.VK_LEFT:
                    if (directionX != 1) {
                        directionX = -1;
                        directionY = 0;
                    }
                    break;
                case KeyEvent.VK_RIGHT:
                    if (directionX != -1) {
                        directionX = 1;
                        directionY = 0;
                    }
                    break;
                default:
                    break;
            }
        }
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Snake Game");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(new SnakeGame());
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}

这是一个使用Java Swing库编写的贪吃蛇游戏。游戏根据用户的按键输入移动蛇身并检查碰撞，包括边界碰撞、自身碰撞和食物碰撞。蛇身和食物会在面板上绘制，并且在碰撞检测时更新。游戏会在用户碰撞或游戏结束时停止，并显示"Game Over"的文字提示。

### 回答3：
Java代码如下：

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

public class SnakeGame extends JFrame {

    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;
    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;
    private Random random;

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

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

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

        // 绘制蛇
        for (int i = 0; i < bodyParts; i++) {
            if (i == 0) {
                g.setColor(Color.green);
            } else {
                g.setColor(Color.yellow);
            }
            g.fillRect(x[i], y[i], UNIT_SIZE, UNIT_SIZE);
        }

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


        // 绘制得分
        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());
    }

    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] = 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;
        }
    }

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

    private void checkCollision() {
        // 碰到自己的身体游戏结束
        for (int i = bodyParts; i > 0; i--) {
            if ((x[0] == x[i]) && (y[0] == y[i])) {
                running = false;
            }
        }

        // 碰到边界游戏结束
        if (x[0] < 0 || x[0] >= WIDTH || y[0] < 0 || 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;
    }

    private class MyKeyAdapter extends KeyAdapter {
        @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;
            }
        }
    }

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

这是一个简单的贪吃蛇游戏的Java代码。游戏窗口大小为400x400像素，每个方块大小为20像素。蛇由一系列方块组成，初始长度为6个方块。蛇在窗口中移动，并根据玩家的操作改变方向。目标是吃掉苹果，并且每吃一个苹果，蛇的长度增加1。游戏结束的条件为蛇碰到自己的身体或者碰到窗口边界。游戏使用了计时器来控制蛇的运动和窗口的绘制。