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Because of the fear of death, people will have a bipolar tendency towards it. Either don't talk about it or be too romantic. But death is the ultimate powerlessness.Three-man four-legged leggings race苏角犹豫了很久。不妥，杨参议实乃东南奇才，不该只身犯险。他本想着直接留在项羽军中，再不回去，没想到……唉。User class unified interface, User1 and User2 are different objects respectively, and they are related. If the mediator mode is not adopted, the two need to hold references to each other, so the coupling degree between the two is very high. In order to decouple, the Mediator class is introduced to provide unified interface, and MyMediator is its implementation class, which holds instances of User1 and User2 to control User1 and User2. In this way, User1 and User2 objects are independent of each other. They only need to maintain a good relationship with the Mediator, and the rest is maintained by the MyMediator class! Basic implementation:郑氏嗤地一声笑了。