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Final visit: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:Now use code to describe this scene. First, define a Light class. It can be predicted that the light object light will be created from the Light class. The light object will have two attributes. State will be used to record the current state of the light and button will be used to represent the specific switch button.Comparison of True and False Details黑白子所使用的兵器是一面棋枰，亦是把围棋博弈之道化为生死搏杀的武功。天下三分，烽火四起，在这个英雄辈出的时代，战争不仅有刀光剑影，亦不只是血肉搏杀。秘密情报线上的生死角逐，正涌动于滚滚洪流的阴影当中。玄武候和白虎将军却一致认为：应该将他们分散往靖国各州府落户。