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Mobile phone address book memos, operating system backup points, database backup, etc. in life are all applications of memo mode. Memorandum mode captures the internal state of an object without destroying the encapsulation and saves the state outside the object, so that the object can be restored to its original state later. The specific structure diagram is as follows:　　通过小姨淑美，玝爷认识了具有维新思想的文海澄，推荐给光绪，深为赏识并委以重任。在淑美的捉弄下，玝爷竟闹出了与朱帘秀“私奔未遂”的闹剧。碍于面子，玝爷只身到通州，却掉入了世铎设下的陷阱中，被诬成劫镖之人，拉赴刑场问斩 ………It is said that Pepsi is also keen on the marketing strategy of multi-star endorsements, and Oppo and Pepsi have also cooperated across borders many times.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:这时候，那个少年叫花子才惊慌起来，叫道：小姐，你怎样了？小姐。　　叶春生立刻在电话里向老板汇报，自己连夜驱车赶到了老九的祖屋，从防火隔墙中取出一个铁盒。铁盒里是几张老照片、存折和一把老式钥