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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:DI: Dependency Injection《咕噜咕噜美人鱼》是浙江新长城动漫有限公司出品的动画电影，由杨广福执导，张美娟、赵梦娇、陈大刚等联袂配音。该片讲述了一条遭遇海怪袭击的美人鱼，凭借自身的勇敢和小伙伴们的帮助，救赎亲人、回归家园的故事。　　这部剧由合作过SBS著名历史剧《女人天下》的导演金在衡和编剧刘东允再度携手，全剧制作精良，服装布景考究，场面宏大华丽；既有对人性的歌颂鞭挞，也有对后宫、太监生活的揭秘；既有对勾心斗角、权力倾轧的刻画，还不乏对当代政治的影射。是一部一旦看了可能就会爱不释手的佳作。连环杀人案中失去妹妹的警察泰秀（金相庆 饰）在雨夜潜伏侦查一起肇事逃逸案的过程中，意外抓获了犯案多起的连环杀人嫌疑犯姜川（朴圣雄 饰），而悲剧也由此开始。泰秀意外得知姜川正是杀害自己妹妹的凶手，为了找到妹妹的尸首，泰秀竟跪了下来...而在指认现场的时候，另一个痛失爱妻的男人盛贤（金成钧 饰）悲愤现身......听老辈人说，有钱都买不到东西哩。