使用Java语言实现一个贪吃蛇小游戏

好的，下面是一个简单的贪吃蛇小游戏的Java代码：

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

public class SnakeGame extends JFrame implements ActionListener {

    private static final long serialVersionUID = -4272056262246670918L;
    private JPanel gamePanel;
    private JButton startButton, stopButton;
    private Timer timer;
    private int delay = 200; // 蛇移动的速度
    private int score = 0; // 得分
    private int snakeLength = 3; // 蛇的长度
    private int[] snakeX = new int[100]; // 蛇身体的X坐标
    private int[] snakeY = new int[100]; // 蛇身体的Y坐标
    private int foodX; // 食物的X坐标
    private int foodY; // 食物的Y坐标
    private int direction = 1; // 蛇的方向，1表示向上，2表示向下，3表示向左，4表示向右

    public SnakeGame() {
        super("贪吃蛇小游戏");

        gamePanel = new JPanel();
        gamePanel.setLayout(null);
        gamePanel.setPreferredSize(new Dimension(400, 400));
        gamePanel.setBackground(Color.WHITE);
        getContentPane().add(gamePanel, BorderLayout.CENTER);

        startButton = new JButton("开始游戏");
        startButton.setBounds(50, 420, 100, 30);
        startButton.addActionListener(this);
        gamePanel.add(startButton);

        stopButton = new JButton("结束游戏");
        stopButton.setBounds(250, 420, 100, 30);
        stopButton.addActionListener(this);
        gamePanel.add(stopButton);

        timer = new Timer(delay, this);

        initGame();
    }

    private void initGame() {
        score = 0;
        snakeLength = 3;
        snakeX[0] = 100;
        snakeY[0] = 100;
        snakeX[1] = 75;
        snakeY[1] = 100;
        snakeX[2] = 50;
        snakeY[2] = 100;
        foodX = (int) (Math.random() * 380 / 10) * 10;
        foodY = (int) (Math.random() * 380 / 10) * 10;
        direction = 1;
    }

    private void paintSnake(Graphics g) {
        for (int i = 0; i < snakeLength; i++) {
            if (i == 0) {
                g.setColor(Color.RED);
            } else {
                g.setColor(Color.BLACK);
            }
            g.fillRect(snakeX[i], snakeY[i], 10, 10);
        }
    }

    private void paintFood(Graphics g) {
        g.setColor(Color.GREEN);
        g.fillOval(foodX, foodY, 10, 10);
    }

    private boolean isEatFood() {
        if (snakeX[0] == foodX && snakeY[0] == foodY) {
            return true;
        } else {
            return false;
        }
    }

    private boolean isGameOver() {
        if (snakeX[0] < 0 || snakeX[0] > 390 || snakeY[0] < 0 || snakeY[0] > 390) {
            return true;
        }
        for (int i = 1; i < snakeLength; i++) {
            if (snakeX[i] == snakeX[0] && snakeY[i] == snakeY[0]) {
                return true;
            }
        }
        return false;
    }

    private void moveSnake() {
        for (int i = snakeLength - 1; i > 0; i--) {
            snakeX[i] = snakeX[i - 1];
            snakeY[i] = snakeY[i - 1];
        }
        if (direction == 1) {
            snakeY[0] -= 10;
        } else if (direction == 2) {
            snakeY[0] += 10;
        } else if (direction == 3) {
            snakeX[0] -= 10;
        } else if (direction == 4) {
            snakeX[0] += 10;
        }
    }

    private void createNewFood() {
        foodX = (int) (Math.random() * 380 / 10) * 10;
        foodY = (int) (Math.random() * 380 / 10) * 10;
        for (int i = 0; i < snakeLength; i++) {
            if (snakeX[i] == foodX && snakeY[i] == foodY) {
                createNewFood();
                break;
            }
        }
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == startButton) {
            initGame();
            timer.start();
            gamePanel.requestFocus();
        } else if (e.getSource() == stopButton) {
            timer.stop();
        } else if (e.getSource() == timer) {
            moveSnake();
            if (isGameOver()) {
                timer.stop();
                JOptionPane.showMessageDialog(gamePanel, "游戏结束，得分为：" + score, "游戏结束", JOptionPane.INFORMATION_MESSAGE);
            } else if (isEatFood()) {
                score += 10;
                snakeLength++;
                createNewFood();
            }
            gamePanel.repaint();
        }
    }

    public void keyPressed(KeyEvent e) {
        if (e.getKeyCode() == KeyEvent.VK_UP && direction != 2) {
            direction = 1;
        } else if (e.getKeyCode() == KeyEvent.VK_DOWN && direction != 1) {
            direction = 2;
        } else if (e.getKeyCode() == KeyEvent.VK_LEFT && direction != 4) {
            direction = 3;
        } else if (e.getKeyCode() == KeyEvent.VK_RIGHT && direction != 3) {
            direction = 4;
        }
    }

    public static void main(String[] args) {
        SnakeGame snakeGame = new SnakeGame();
        snakeGame.setSize(400, 500);
        snakeGame.setResizable(false);
        snakeGame.setLocationRelativeTo(null);
        snakeGame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        snakeGame.setVisible(true);
    }
}

这个代码使用了Java Swing界面库来实现界面，使用了一个定时器来控制蛇的移动，使用了键盘事件来控制蛇的方向。在界面上有开始游戏和结束游戏两个按钮，还有得分的显示。在游戏开始时，初始化蛇的位置、长度、方向和食物的位置。在定时器的每次触发中，先判断游戏是否结束，然后再判断蛇是否吃到了食物，如果吃到了就增加得分和蛇的长度，并重新生成食物。最后更新界面，重绘蛇和食物。