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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:奕跑青春 -- 群星该剧讲述了毒理昆虫学专业研究生谭景天无意中卷入一桩离奇的案件，在协助警察破案的过程中，与年轻女法医金灵产生交集，并解开了自己的身世之谜，揪出了隐藏多年的幕后真凶的故事。没事，不疼。Collection collection = new MyCollection ();If there is no one tomorrow night, then I will delete the post.