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The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From Baidu在外打工的李文博回到家之后，发现他的家人之间出现了许多问题。为了维护好自己的家，李文博打算留在家中。而在这段时间，李文博被家人深深地感动着，他明白了一句话，家人永远是最亲近的人。一名警察在经过内部调查后被停职，他在全国各地游荡，寻找自己的网恋对象。　　Amazon宣布续订《#诈欺担保人# Sneaky Pete》第三季，并会在下周于洛杉矶开机拍摄。八九十年代，混迹一方小有成就的武术教练杨远为了替朋友打抱不平，陷入了和地痞的生死纠葛之中。出狱后，物是人非，曾经的兄弟抢占了自己的女友，而地痞不断骚扰他，并最终枪杀了他的弟弟，本想安分过日子的他决意复仇，等待他的又是一次寒窗岁月。12Before that, I read a lot of related articles, and after I have an overall understanding, I will begin to experience it. Before you start work, you should make clear what the event distribution mechanism is to study: the transfer rules of event sequences between ViewGroup/View.