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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　 电影讲述了明朝南安太守杜宝之女杜丽娘游走后花园，梦到有一位年轻书生手持半枝垂柳前来求爱,两人在牡丹亭幽会，并在梦中相爱。于此同时书生柳梦梅也梦见在一座花园的梅树下立着一位佳人,说同他有姻缘之份,从此踏上了寻梦之路。我不应该嫁给你这样的人，我应该回乡下，嫁一个像我爹那样的人，简简单单过一辈子……说着话，她泣不成声。至于无敌，还是贴一些的，只是现在距离郑和的年代太过遥远，在南洋眼里，弗朗机的舰队才是无敌之师，眼前大明的舰队虽然雄壮，但与弗朗机交战，孰胜孰负还不好说。从小到大都个性强烈的齐若谷（马伊琍 饰）怀揣着心中的远大理想成为了一名专门报道社会新闻的职业记者。一次外出采访时，身背重要摄影器材的若谷成为了歹徒觊觎的对象，幸运的是，恰好路过此地的男子陈剑平（贾一平 饰）无私地伸出了援手，若谷这才逃过了一劫，她和剑平之间的缘分也就此开始。