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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板栗劝不住奶奶，正烦躁，闻言怒道：你当我们想闹？刚才你就说有话好好说，可结果哩？你外公一家拂袖而去，倒好像被我们欺负了一般。DDoS attacks have been unprecedented in the past few years. Hacker activists know that the downtime of financial service websites means millions of dollars in business losses every minute. The attacks on Bank of America, First Capital Finance Corporation, Chase Bank, Citibank, PNC Bank and Wells Fargo Bank are ruthless and subtle, making many security executives even too afraid to discuss the details in depth.姥爷赵寰李，是留日学习机械专业的优秀人才。日军的重重紧逼终于激起了他抗争的决心，与共产党人携手粉碎了日本人建造武器工厂的计划，却也因此失去了未婚妻、女儿、小妹等人。姥爷心灰意冷，只想了此残生。在被日军追杀时，被街头卖笑女小红所救，并意外卷入日军的“西部计划”危机中。为了挣扎求存和为被日军灭口杀害的一百多工人复仇，揭穿日军暗杀民主爱国人士的阴谋及获取南京大屠杀的证据。姥爷赵寰李在地下党的帮助和军统特工的暗中支持下，与日本特高课名宿展开了激烈斗争。姥爷以其高超的智慧和出类拔萃的机械专业技巧，终于营救出民主爱国人士，并协助八路军制作了山炮，毁掉了日军的“西部计划”秘密基地，获取了南京大屠杀的证据，为抗战胜利和东京大审判立下了不可磨灭的功勋。“实在北京人”大林来自“中国式”传统家庭，刚刚从法学专业毕业便应父母要求，一头扎进求职大军随波而行。几十次面试失败后，终于在“林子大了”咖啡馆寻得一份与初衷相去甚远的工作——服务员。取意“什么鸟都有”的“林子大了”咖啡馆里，一群八竿子打不着的人，各怀不同的目标从天南海北走到一起，伴随东升西落与喜怒哀乐，触发出一段段并不可歌可泣却有笑有泪的故事。李敬文点头，暗叹边关不宁，内地也跟着盗寇四起。刘南生（刘德华饰）——社交舞教师，温文尔雅，英俊潇洒，舞艺精堪之余，更待人亲善。一套舞蹈哲学，令不少学生从拾自信。在这个缺乏自信的年代，南生简直就是苦海明灯，一代良师，但只限活于舞台上。当他摘下其华丽伪装后，刻薄成性，当一众学生如羊股一般，极尽其诱骗的能事。在多年以后南生不知不觉亦欺骗了自己，渐渐忘记了舞蹈的意义，甚至自己的人生意义……直至一天，南生遇上了阿金！