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我勒个去。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刀客的声音比他的刀还要冷。好好，多谢大王了。故意的消极怠工，荥阳的城防问题越来越大。父亲弗雷德和母亲德洛丽丝是怪物猎人，家庭闹剧自然异常可怕。而双胞胎阿薇和杰夫也隐藏着他们自己的奇怪秘密。/sexy