能不能利用java写一段能运行贪吃蛇的代码

当然可以！以下是一个简单的 Java 贪吃蛇游戏代码示例，希望能帮到你：

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

public class SnakeGame extends JPanel implements ActionListener {
    private Timer timer;
    private boolean running;
    private int size = 20;
    private int x[] = new int[400];
    private int y[] = new int[400];
    private int body = 3;
    private int appleX, appleY;
    private boolean left, right, up, down;

    public SnakeGame() {
        setPreferredSize(new Dimension(400, 400));
        setBackground(Color.black);
        setFocusable(true);
        addKeyListener(new KeyAdapter() {
            public void keyPressed(KeyEvent e) {
                int keyCode = e.getKeyCode();
                if (keyCode == KeyEvent.VK_LEFT && !right) {
                    left = true;
                    up = false;
                    down = false;
                }
                if (keyCode == KeyEvent.VK_RIGHT && !left) {
                    right = true;
                    up = false;
                    down = false;
                }
                if (keyCode == KeyEvent.VK_UP && !down) {
                    up = true;
                    left = false;
                    right = false;
                }
                if (keyCode == KeyEvent.VK_DOWN && !up) {
                    down = true;
                    left = false;
                    right = false;
                }
            }
        });
        startGame();
    }

    public void startGame() {
        x[0] = 0;
        y[0] = 0;
        x[1] = -size;
        y[1] = 0;
        x[2] = -2 * size;
        y[2] = 0;
        appleX = (int) (Math.random() * 20) * size;
        appleY = (int) (Math.random() * 20) * size;
        running = true;
        timer = new Timer(100, this);
        timer.start();
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        if (running) {
            g.setColor(Color.red);
            g.fillOval(appleX, appleY, size, size);
            for (int i = 0; i < body; i++) {
                if (i == 0) {
                    g.setColor(Color.green);
                } else {
                    g.setColor(Color.white);
                }
                g.fillRect(x[i], y[i], size, size);
            }
        } else {
            g.setColor(Color.white);
            g.setFont(new Font("Arial", Font.BOLD, 30));
            g.drawString("Game Over!", 150, 200);
        }
    }

    public void actionPerformed(ActionEvent e) {
        if (running) {
            for (int i = body; i > 0; i--) {
                x[i] = x[i - 1];
                y[i] = y[i - 1];
            }
            if (left) {
                x[0] -= size;
            }
            if (right) {
                x[0] += size;
            }
            if (up) {
                y[0] -= size;
            }
            if (down) {
                y[0] += size;
            }
            if (x[0] == appleX && y[0] == appleY) {
                body++;
                appleX = (int) (Math.random() * 20) * size;
                appleY = (int) (Math.random() * 20) * size;
            }
            for (int i = 1; i < body; i++) {
                if (x[0] == x[i] && y[0] == y[i] || x[0] < 0 || x[0] > 380 || y[0] < 0 || y[0] > 380) {
                    running = false;
                }
            }
            repaint();
        } else {
            timer.stop();
        }
    }

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

这个代码使用了 Java 的 Swing 库来绘制游戏界面，使用了计时器（Timer）来控制游戏的运行，具体实现可以看代码中的注释。