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Command.exe ();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/nosepick (sniffing)真是童言无忌。Using proxy mode, the function can be divided more clearly, which is helpful for later maintenance!传国玉玺的象征意义是不言而喻的，项羽兴奋地将其捧在手中把玩，一种强大和权力和征服*漫上心头，一种天下我有的感觉油然而生。