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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昔みたい いしだあゆみ 竹脇無我动荡岁月的一曲挽歌 共产党引蛇出洞剿灭各路匪首1949年，桂林白崇禧公馆，各路匪首，垂死挣扎，叫嚷要实行蒋介石的“应变计划”。并将大瑶山和十万大山等地作为反共游击根据地，白崇禧所器重的匪一二六军军长林秀山被赠与了一包上等的烟土。与此同时，我南下部队进入广西，军区领导人张云逸、莫文骅、李天佑感慨风云变幻，20年打了个来回。林匪在撤进山里前，对万山县进行了空前洗劫，炸毁了县城，并强迫乡民进山当匪。偏偏他就喜欢她这样。该剧根据作家Nelson Johnson的同名畅销小说改编。受了致命伤的摩根必须决定是否帮助一个绝望的陌生人，而一个神秘的赏金猎人试图完成金妮没能完成的事情。住在某公寓702的十年情侣尹乐闻和周智齐正在闹分手，超级直男周智齐认为尹乐闻不再懂他，尹乐闻挽回无果只能狂刷存在感。由于这场分手风波愈演愈烈，住在701和703的邻居们也加入到这场“复合大作战”中，可女追男并不容易，追回前男友难上加难，6个年轻人的生活也因这场分手风波而发生了变化……