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The disadvantage of state mode is that many state classes will be defined in the system. Writing 20 state classes is a boring job, and many objects will be added to the system. In addition, because the logic is scattered in the state class, although unpopular conditional branch statements are avoided, it also causes the problem of logic dispersion, and the logic of the entire state machine cannot be seen in one place.项羽的传召尚未送到？长须男子有些疑惑。《我爱大小姐》是由吴淡如,林慧萍主持，东森综合台播出的一档全新谈话性节目，讲诉女人间的那些事。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:尹旭点头道：现在需要大家齐心协力。Method of competition: