五子棋 棋盘类实现棋盘绘制功能，棋子产生类负责棋子的生产 棋盘落子负责电脑随机落子和玩家指定落子以及判断胜负的功能，注释丰富，仅适合初学者-Backgammon Board to achieve the checkerboard drawing capabilities, Chess class is responsible for pieces of the production Board set up responsible for a computer-generated set up