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However, none of the small traders did so. "They just repeat it every day, paying interest for nine years."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:山芋他们虽然也是整天玩，但每天上午和下午，槐子都规定他们读一个时辰的书，省得跟放牛似的，把学堂学的字都忘光了。姐姐你看，这是什么。And firewall functionality for packet filtering