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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:Button-Reaction Attack2121张槐搂着儿子笑道：你还太小了，夫子不收哩。在刑部受到连番打击，心神震动，头疼发作，记忆松动。If there are already people reporting the case at the headquarters, you don't have to rush to the headquarters to report the case. After a period of time, the public security organ at the headquarters will issue an investigation. At this time, the public security organ at your location will contact you to obtain evidence.WOWOW原创剧集《世界奇妙君物语》将于2021年3月放送。