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Note: When adding rules, the order of the rules is very important葫芦哥哥，你将来做啥将军好哩？得想好一个名头。Because of Jay, he did not open Weibo.风宫库洛自幼和父亲过着相依为命的生活，哪知道，有一天，这唯一的依靠也不告而别，只留下高筑的债台，需要库洛来偿还。为了还债，库洛来到了债主白龙院家，他将在那里担任男仆的职务，用劳动来抵债。白龙院家的少爷米斯是一个性格古怪充满了恶趣味的人，他给身为男性的库洛穿上了女仆的制服，以此为乐，并且不断的骚扰着库洛，令后者十分苦恼。In simple and popular terms, it is "white plus black minus, bright plus dark minus"'w. P% n' E3 xThe 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