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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 BaiduJuly 26? Fire lines? On this day, I chose...香荽却十分有耐心，对秦溪道：小溪，等下姐姐带你玩，说故事给你听。The fourth step is to be responsible for the implementation of specific button events. After clicking the button, Context does not do any specific operations, but delegates the request to the current status class for execution:From this case, we can sum up the value of recommended content. First, we can meet users' content consumption needs and make it easier for users to see the best quality and most typical content. This is consistent with the root cause of making content products, but there are four other functions:Decision Format:11. Combination Mode (Composite)