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5. Too vainThe 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 BaiduIt's not shameful to be a female, and you have to bear such a family, everyone will only sympathize with you. The problem is, it would be unwise to be a female and offend the gold owner.　　然而，不愉快的事件陆续发生。美凤遭同学Johnny拍下色 情录像带、凌浩才为替美凤出头却惨遭打死。身为他们首领的陈勇愤怒地将Johnny打得重伤，以致自己再度入狱。　　随着第二集最后那个“to be concluded”的字幕，所有观众的心都被吊在了万丈悬崖边上：尼奥到底怎么啦？他怎么可能在“真实”世界里毁灭电子章鱼？他又如何能“感觉”到机器？已经侵入了班恩（Bane）大脑的史密斯又会对身处昏迷中的尼奥开展什么行动？I like this kind of bosses who do not say anything but dry goods directly and know at a glance.