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When your requirements are only A and the requirements will not change in the future, there is no need to use factory mode. To put it bluntly, packaging is changing. When your requirements change and change greatly and frequently, using mode is a good choice. Packaging "change" is the principle of design mode.几岁的时候，你俩加上葫芦，什么事都敢干。Telecommunications不仅仅是离开这里。Forever Buckle Belt 13MM 100In 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: