写一个贪吃蛇JAVA

写贪吃蛇游戏需要编写代码，可以使用 Java 语言实现。以下是一个简单的 Java 贪吃蛇代码的例子：

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.util.ArrayList;

import javax.swing.JFrame;

public class SnakeGame extends JFrame {

  private static final long serialVersionUID = 1L;
  
  private static final int WIDTH = 300, 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 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() {
    initGame();
  }

  private void initGame() {
    setBackground(Color.black);
    setSize(WIDTH, HEIGHT);
    setLocationRelativeTo(null);
    setResizable(false);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setVisible(true);

    addKeyListener(new Keyboard());

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

  @Override
  protected 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 i = 0; i < dots; i++) {
        if (i == 0) {
          g.setColor(Color.green);
        } else {
          g.setColor(Color.yellow);
        }
        g.fillOval(x[i], y[i], DOT_SIZE, DOT_SIZE);
      }
    } else {
      gameOver(g);
    }
  }

  private void gameOver(Graphics g) {
    String message = "Game Over";
    g.setColor(Color.white);
    g.drawString(message, 125, HEIGHT / 2);
  }

  private class Keyboard extends KeyAdapter {
    @Override
    public void keyPressed(KeyEvent e) {
      int key = e.getKeyCode();
      if ((key == KeyEvent.VK_LEFT) && (!rightDirection)) {
        leftDirection = true;
        upD