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Fu Confucian TempleSecond: Look at the class from an external perspective. Remember not to require others to know how you implement a method before using my class.There is an eccentric person in our class. His name is Lin Nian. He is famous in the class and even in the whole school. Our class often calls him "Little BB".在第四季初期加入该剧的迪伦·斯普雷贝利（Dylan Sprayberry）在第五季中将变为常规角色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 BaiduUSA台将拍摄剧集《悬案》(Unsolved)，讲述说唱史两位传奇人物2Pac和The Notorious B.I.G.的谋杀案。近日饰演两人的演员都选出，分别是《冲出康普顿》中就演了2Pac的Marcc Rose和新人Wavyy Jonez。2Pac和The Notorious B.I.G.是90年代美国斗得不可开交的东西岸说唱界的代表人物，先后在1996和97年被枪杀，至今都仍是悬案。该剧就将讲述这前后的事了，由大热剧集《美国犯罪故事：公诉辛普森》的Anthony Hemingway执导并担任制作人，乔什·杜哈明(《变形金刚》)饰演调查该案件的洛杉矶警署警探Greg Kading，此人之后也将他的查案所见写成了书，吉米·辛普森饰另一名警探Russell Poole。Law of Demeter (LoD) is also called Least Knowledge Principle (LKP), which means that an object should know as little as possible about other objects. In other words, a module or object should interact with other entities as little as possible, making the system functional modules relatively independent, so that when a module is modified, the fewer modules will be affected and the easier it will be to expand.