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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郑氏微微一笑，道：你能明白就好。Compositae plants play an important role in nature, including the most common daisies, sunflowers and thistles. It has a total of 13,000 species in the world, most of which are herbs, as well as some woody plants and lianas. When we look at their flowers, they look like a flower, but they are actually dozens of small flowers that are tightly together. They chose to gather together to attract the attention of insects. Because if each small flower grows independently, they do not have much attraction to insects, but when they gather together in inflorescence like this, they will form a bright yellow flag that insects cannot refuse. So whenever an insect passes by, it spreads not only the pollen of one flower, but dozens of small flowers.作为一个大龄单身男青年，网恋or相亲，哪个才能得到真爱？单身男程序员周达面对老爹的花式催婚，不得已开始了自己的相亲之旅。其实他一直有一个网恋对象——江莹，为了江莹，周达决定搞黄所有的相亲。一系列啼笑皆非的相亲之后，坐在他对面的居然是自己的高中同桌张萍。周达开始与张萍朝夕相处，江莹却毫无征兆的出现，而在此时，张萍的电话打了过来……张萍发现了江莹似乎有什么秘密……Note: I added the content in "".陈毅市长，电影名，著名剧作家沙叶新所著的话剧，1981年由上海电影制片厂搬上银幕；这部电影主要剧情为：1949年5月，上海解放后，陈毅（1901—1972）同志带着满身的战火硝烟出任新中国首任上海市长，当时的旧上海，满目疮痍，积难重重，工厂倒闭，商店关门，粮煤奇缺，失业人口剧增……刚解放的上海确实是个烂摊子；陈毅同志以对党对革命事业的无比忠诚，依靠工人阶级、革命干部和知识分子，团结民族资产阶级，正确地执行党的方针政策，大刀阔斧地开展工作；在短短的一年时间里，陈毅为上海的复兴与发展打开了一个新局面。但是他们对这个年轻人的动机感到怀疑，并很快开始谋划如何将他遣散。