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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我不。　　kaowkla是一名建筑学院的学长，他的爱好就是给Plawale乐队和Cookkai乐队辅导艺术课。有一天，一个高中生Plod来With Love公寓找亲生哥哥Prin。于是Plod就遇到了kaowkla，他想让Kaokal辅导自己艺术。由于两人常常见面，举止亲密，所以Plod无法自拔地爱上了kaowkla。但是kaowkla却把Plod当作弟弟一样看待。Plod不轻易认输，他努力要改变自己，想赢得kaowkla对自己的好感。断水出鞘，尹旭站在原地没有动弹。5.1 The syntax is as follows: