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5.4 Pad description: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:ConcreteHandler: Specific handler红椒道：娘，我正要跟奶奶和爹娘说这事呢。看着徐宣的表情，尹旭说道：好啊，尽管放马过来，我们可都是对徐家的实力拭目以待呢？看看到底是确有其事？还只是浪dàng虚名？红衣少鼻徐彤喊道：二哥，还跟他废话做什么？直接快些动手。