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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 BaiduChapter 26大哥，你别闹了。那戏没啥好看的，一句话扯着嗓子唱了半天，绕了好几个弯还没完，都不晓得他唱的是啥。パパラッチ 木村拓哉 川合千春Brother, there is a new counterexample here. I also looked for the cartoon again, and saw this. This should be a six-way pattern by rights, but the neckline has a jade hook.Map of the area where the body was found