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State machines also have a wide range of uses in game development, especially the logic writing of game AI. The main characters in the game have various states such as walking, attacking, defending, falling and jumping. These states are both interrelated and constrained. For example, if attacked during walking, it will switch from walking state to falling state. In the state of falling, it can neither attack nor defend. Similarly, you cannot switch to the defensive state during the jump, but you can attack. This kind of scenario is very suitable to be described by state machine. The code is as follows:Note, "How to Learn Design Patterns" from: http://blog.csdn.net/yqj2065/article/details/39103857　　影片讲述了一个关乎友情、勇气与探索之趣的动人故事。关于人类这个“小脚怪”的消息让原本单纯的雪人族群陷入了骚乱之中，他们开始好奇，在雪村之外，究竟存在着一个怎样的世界？那么林先生能分享一下，你和天启一起创业的一些趣事吗？我想大家肯定都很好奇。UnicomI don't know how other departments write it. I always feel that I have been writing it all the time, and these things are often repeated, taking up time not to say it, and sometimes I don't know how to write it.