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The above humble opinion.Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:《二龙湖爱情故事》是一部通过小人物张立东的成长轨迹来展现当代农村青年的向上精神和美好爱情的生活画卷，从而传递给观众更多正能量的故事At this time, iTunes will display a warning: "Your iPhone 7 has been detected" and you can restore your phone.萧何尽发关中男子才得意让刘邦稳住阵脚，东山再起。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...Witch Ajialu