用java实现贪吃蛇代码

以下是一个简单的 Java 贪吃蛇代码，希望对你有帮助：

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.Random;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Snake extends JPanel implements Runnable, KeyListener {
    private static final long serialVersionUID = 1L;
    private Thread thread;
    private boolean running;
    private boolean right = true, left = false, up = false, down = false;
    private Point fruit;
    private int length = 5;
    private Point[] snake = new Point[100];
    private Random random;

    public Snake() {
        setFocusable(true);
        addKeyListener(this);
        random = new Random();
        fruit = new Point(random.nextInt(49) + 1, random.nextInt(49) + 1);
        snake[0] = new Point(0, 0);
        for (int i = 1; i < snake.length; i++) {
            snake[i] = new Point(-1, -1);
        }
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.setColor(Color.BLACK);
        for (int x = 0; x < getSize().width; x += 10) {
            g.drawLine(x, 0, x, getSize().height);
        }
        for (int y = 0; y < getSize().height; y += 10) {
            g.drawLine(0, y, getSize().width, y);
        }
        g.setColor(Color.RED);
        g.fillRect(fruit.x * 10, fruit.y * 10, 10, 10);
        for (int i = 0; i < snake.length; i++) {
            if (snake[i].x >= 0 && snake[i].y >= 0) {
                g.setColor(Color.GREEN);
                g.fillRect(snake[i].x * 10, snake[i].y * 10, 10, 10);
            }
        }
    }

    public void start() {
        running = true;
        thread = new Thread(this);
        thread.start();
    }

    public void stop() {
        running = false;
        try {
            thread.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void run() {
        while (running) {
            if (right) {
                for (int i = length - 1; i > 0; i--) {
                    snake[i].x = snake[i - 1].x;
                    snake[i].y = snake[i - 1].y;
                }
                snake[0].x++;
                if (snake[0].x > 49) {
                    snake[0].x = 0;
                }
            }
            if (left) {
                for (int i = length - 1; i > 0; i--) {
                    snake[i].x = snake[i - 1].x;
                    snake[i].y = snake[i - 1].y;
                }
                snake[0].x--;
                if (snake[0].x < 0) {
                    snake[0].x = 49;
                }
            }
            if (up) {
                for (int i = length - 1; i > 0; i--) {
                    snake[i].x = snake[i - 1].x;
                    snake[i].y = snake[i - 1].y;
                }
                snake[0].y--;
                if (snake[0].y < 0) {
                    snake[0].y = 49;
                }
            }
            if (down) {
                for (int i = length - 1; i > 0; i--) {
                    snake[i].x = snake[i - 1].x;
                    snake[i].y = snake[i - 1].y;
                }
                snake[0].y++;
                if (snake[0].y > 49) {
                    snake[0].y = 0;
                }
            }
            if (snake[0].x == fruit.x && snake[0].y == fruit.y) {
                length++;
                fruit.setLocation(random.nextInt(49) + 1, random.nextInt(49) + 1);
            }
            for (int i = 1; i < length; i++) {
                if (snake[0].x == snake[i].x && snake[0].y == snake[i].y) {
                    System.out.println("You Lose!");
                    stop();
                }
            }
            repaint();
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    @Override
    public void keyPressed(KeyEvent e) {
        int key = e.getKeyCode();
        if (key == KeyEvent.VK_RIGHT && !left) {
            right = true;
            up = false;
            down = false;
        }
        if (key == KeyEvent.VK_LEFT && !right) {
            left = true;
            up = false;
            down = false;
        }
        if (key == KeyEvent.VK_UP && !down) {
            up = true;
            left = false;
            right = false;
        }
        if (key == KeyEvent.VK_DOWN && !up) {
            down = true;
            left = false;
            right = false;
        }
    }

    @Override
    public void keyReleased(KeyEvent e) {
    }

    @Override
    public void keyTyped(KeyEvent e) {
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Snake");
        Snake snake = new Snake();
        frame.add(snake);
        frame.setSize(500, 500);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        snake.start();
    }
}

注意：此代码只是一个简单的实现，可能存在一些问题和不足之处，需要根据实际情况进行调整和优化。