Position.java　　：辅助类 SerpentGameCanvas.java　　：游戏主控类 Maze.java　　　　：迷宫 SerpentGame.java　　：应用主控类 Serpent.java　　：蛇类 GreedySerpent.java　　　　：NPC蛇类 Rect.java　　　　：辅助类 Frog.java　　　　：青蛙类 BlindSerpent.java　　　　：NPC蛇类 DirectionHelper.java　　：辅助类 RunnerSerpent.java　　　　：NPC蛇类 Egg.java　　　　：蛋类-Position.java: auxiliary category SerpentGameCanvas.java: Game Master Class Maze.java: maze SerpentGame.java: Application of Master Class Serpent.java: snakes GreedySerpent.java: NPC snakes Rect.java: auxiliary category Frog.java: frog type BlindSerpent.java: NPC snakes DirectionHelper.java: auxiliary category RunnerSerpent.java: NPC snakes Egg.java: eggs