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金鹰卡通卫视将推出一档大型原创幼儿成长真人秀节221. X.X.2就不能另挑一天吗？《笑傲江湖》电视剧可是就在今天播放。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以七仙女的眼光，真要爱上一个普通穷书生，那才奇怪。Notification (Advice)