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U.S. 381.5 million 1.9 millionEach object has its corresponding state, and each state corresponds to some corresponding behaviors. If an object has multiple states, there will be many behaviors. Then the judgment of these states and the behavior completed according to the states will lead to multiple conditional statements, and if a new state is added, the existing code needs to be changed. This kind of design obviously violates the principle of opening and closing, and the state mode is used to solve such problems.AF, focus mode.In the system, the client often needs to interact with multiple subsystems, which causes the client to change with the change of subsystems. At this time, the appearance mode can be used to decouple the client from each subsystem. Appearance mode refers to providing a consistent facade for a group of interfaces in the subsystem. It provides a high-level interface that makes the subsystem easier to use. For example, the customer specialist of Telecom can let the customer specialist complete the services such as charging telephone charges and modifying packages without interacting with various subsystems by himself. The specific class structure diagram is as follows:不值得投，那就投给那些一直在爆发的作者吧，写手都不容易，也希望他们能有一个好成绩，对得起自己的付出。《雪花女神龙》讲述的是江湖女侠上官燕为寻找自己母亲踏上一条前途未卜的凶险历程。十五年前，８岁的上官燕家庭发生惨变，父亲为人所害，母亲下落不明；上官燕幸为武林奇人古天木救走并抚养成人，并传授其绝世剑术雪花神剑。十五年后，上官燕身负神兵“凤血剑”现身江湖，寻……徐文长思路太过跳跃。