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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 BaiduChapter I General ProvisionsAumP一人分饰两角，演绎性格各异的孪生姐妹，Vee饰演温文尔雅的。妹妹是外表光鲜亮丽的明星，但私生活很乱，几次三番的让姐姐背黑锅，幸好姐姐身边有男主不离不弃的守侯，但这又惹来妹妹的嫉妒，不折手段地想要破坏他们。戚继光可没这么大谱儿，赶忙下轿行礼：巡抚大人，末将偶遇赵大人，前来商议军事。他们忙忙碌碌的，宁静郡主却彷徨无助。CBS一口气宣布续订6部正剧，包括《#国务卿女士# Madam Secretary》第6季。影片讲述的是美国前总统约翰·肯尼迪在1963年11月22日遇刺身亡的前四天时间里，发生在前第一夫人杰奎琳·肯尼迪身上的故事。娜塔莉·波特曼将出演杰奎琳，也就是Jackie。据该片的全球联合出品方和制片方熙颐影业透露，对于主创团队选择娜塔莉·波特曼出演杰奎琳·肯尼迪，业界并不感到惊讶。除了她精湛的演技之外，更是在于她独特的知性气质。