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The observer mode defines a one-to-many dependency relationship, allowing multiple observer objects to monitor a certain topic object at the same time. When the state of this topic object changes, all observer objects will be notified so that they can automatically update their behaviors. The specific structure diagram is as follows:学政大人点头，遂让人贴出榜单。一名在找寻灵感的作家无意间得知派·帕帖尔的传奇故事。派的父亲开了一家动物园。因这样特殊的生活环境，少年派对信仰与人的本性自有一套看法。在派17岁那一年，他的父母决定举家移民加拿大以追求更好的生活，而他也必须离开他的初恋情人.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:只可惜秦始皇依旧以严酷之法治理天下，有在死后出现胡亥、赵国的倒行逆施，以至于刚刚用意不过十余年的秦国再次走上入覆灭之路。自从两年前陈胜、吴广起兵之后，六**情时有紧急，他们已经习以为常。