说明：  java确实不适合写桌面应用，这里只是通过这个游戏让大家理解oop面向对象编程的过程，纯属娱乐。代码写的很简单，也很容易理解，并且注释写的很清楚了，还有问题，自己私下去补课学习。
(Java is really not suitable for writing desktop applications, here is only through this game to let you understand the OOP object-oriented programming process, pure entertainment. The code is very simple, easy to understand, and the comments are clearly written, there are problems, go to private remedial lessons to learn.)