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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当料理天才唐正遇到千金小姐程曦，两段错位的人生引出了这场上天注定的姻缘，也将三大世家的六个子女牵绊在了一起：二十多年前，唐冠中、程实两家同时产下儿女，程实夫妇被逼坠崖身亡，导致两个孩子身份错位，唐正成为“万家香”小饭馆老板唐冠中的长子，而唐家亲生女儿程曦却成为山水集团千金。多年后，唐正与程曦相识，两人互生爱恋。一直认为程曦是养女的哥哥程超群向程曦表明爱意，程曦的拒绝使他将矛头指向唐家，再加上宿敌田在天与曾聪明不断制造阻碍，两家的合作之路危机重重。唐正和程曦的身世之谜也逐渐揭开。另一方面，唐家龙凤胎中的儿子唐力爱上了田在天体弱多病的女儿田心，虽遭家人反对却始终坚定不移。龙凤胎女儿唐糖暗恋程超群，明知被利用仍一片痴心，最终以单纯善良感动了超群。当爱情与亲情冲突，阴谋和欲望交织，缘定的爱情最终调配出了最美味的人生料理配方。ABC宣布续订《逍遥法外》第6季，维奥拉·戴维斯回归出演。[Editor's Note] Under the relevant policies of the new college entrance examination, the burden reduction order and the recent "Opinions on Regulating the Development of off-campus Training Institutions", quality education has been increasingly recognized by the market and parents. Among them, the cultivation of children's thinking is also highly valued. However, while the whole quality education is still in its initial development, the cultivation of children's thinking itself is also facing many challenges.她忙挺了挺胸膛，学着香荽的样子，迈方步走路。本片设定在东京的一晚，一名时运耗尽的拳击名手利奥(洼田正孝饰)遇到了他的初恋莫妮卡(小西樱子饰)。莫妮卡是一名吸毒的应召女郎，但她依旧很天真。莫妮卡不知不觉陷入毒品走私计划之中，两人在这晚被腐败的警察、黑帮、利奥的对手以及三合会派来的女杀手追杀。Red Net Time, April 22 (Reporter Hu Yi and Correspondent Zhao Cheng) On the evening of April 19, Super Net Comprehensive "I Am a Singer" ushered in the second knockout round. Eight singers and songwriters all brought the second original song on this stage. In the face of high-pressure and high-intensity programs, Wang Sulong, a powerful singer-songwriter, brought a self-described original song "Odd" in this issue after bringing a "Seed" of "Sing to Everyone" in the previous period.