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I became interested in design patterns about a year ago. When I first read, I seemed to understand it and probably knew what he was saying. After looking at several patterns, I began to look for opportunities to apply them. As a result, none of the modes except Singleton mode found a place to apply. Then I didn't start watching it. I knew it was useless to watch it again, but I didn't give up my attention to design patterns.李长明直起腰，叉着满是泥土的手。A professional brokerage firm can make you get twice the result with half the effort. Including resources, experience, technology, etc.这是一个无处不在却不为人知的世界The intermediary mode is also used to reduce the coupling between classes, because if there is a dependency relationship between classes, it is not conducive to the expansion and maintenance of functions, because as long as one object is modified, other related objects have to be modified. If you use the mediator mode, you just need to care about the relationship with the Mediator class, the relationship between specific classes and the scheduling to the Mediator, which is a bit like the spring container. Let's look at the picture first:And evacuation finger