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For interface programming, a lot of changes that may occur in the system in the future can be isolated. Why? If the code is written for an interface, he can implement the interface with any new class through polymorphism. However, when the code uses a large number of specific classes, once new specific classes are added, the code must be changed. Violating the opening and closing principle.上世纪20年代旧上海，俨然一个冒险家的乐园。成千上万的人蜂拥至此，只为实现那“一朝富贵，平步青云”的美梦。当然，正引起巨大的诱惑性，各色人等纷繁踏至，鱼龙混杂，好一个混乱喧闹所在。Explain a problem in the comment area:还有，不要老是说救命之恩了，属下愧不敢当呢。The Girl Before tells the story of Jane (Gugu Mbatha-Raw), who gets the chance to move into a beautiful, ultra-minimalist house designed by an enigmatic architect (David Oyelowo). There’s just one catch: occupants have to abide by his list of exacting rules. Jane starts to feel the house changing her in unexpected ways, but when she makes the shocking discovery that her predece...主人公黎明和雅楠就像我们身边的大部分年轻人一样，在走进社会，面对工作抉择和生活情感的压力，渐渐丢掉了自己梦想，迷失了生活的方向，缺少了爱的勇气。黎明有对漫画的热爱，但却迫于现实的压力不得不做着自己反感的工作。雅楠乐观正义，却受到父母婚姻的影响，在感情中缺乏安全感的她却不断给生活失意的黎明勇气，让他坚持梦想。二人在相处的过程中彼此建立了信任，情感也随之逐渐发生了变化，彼此从中也都获得了成长。