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No.43 Ricky Lee NeelySome common behavior methods will be defined in the state class, and Context will eventually delegate the request to these methods of the state object. In this example, this method is buttonWasPressed. No matter how many state classes are added, they must implement the buttonWasPressed method立即起身相迎，换上一副豪爽开怀的笑容，朗声笑道：东来，辛苦了。敬文娘白了小儿子一眼，嗔怪道：别瞎说。State mode refers to allowing an object to change its behavior when its internal state changes. The object seems to have modified its class. Divide this sentence into two parts by commas. The first part means to encapsulate the state into a separate class and delegate the request to the current state object. When the internal state of the object changes, different behavior changes will be brought about. The second part is from the customer's point of view, the object used has completely different behaviors in different states. The object seems to be instantiated from different classes, but in fact this is the effect of using delegates.Let me explain the role of these classes: MySubject class is our main object, Observer1 and Observer2 are objects that depend on MySubject, and Observer1 and Observer2 must change when MySubject changes. The AbstractSubject class defines a list of objects to be monitored, which can be modified: add or delete monitored objects, and when MySubject changes, it is responsible for notifying the objects that exist in the list. Let's look at the implementation code:中原江湖，“老伯”孙玉伯的孙府与万鹏王的十二飞鹏帮相互对峙。老伯膝下一子孙剑、 一女孙蝶，两大股肱易潜龙、陆漫天，以及得力助手律香川，还有一处秘密打探江湖动静的基地“快活林”。“快活林”的负责人高寄萍，人称“高老大”，手下有四名秘密杀手：叶翔、石群、孟星魂、小何。高老大想当然地以为老伯会娶自己，却亲闻老伯命律香川接管快活林。恼羞成怒的高老大用计保住“快活林”掌控权，并誓杀老伯。