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故事开始在centerperk咖啡馆里，婚礼上落荒而逃的瑞秋闯进来寻找老同学莫妮卡。莫妮卡的哥哥刚刚离婚，而他从小暗恋的人正是这个落跑新娘瑞秋。瑞秋在莫妮卡家住了下来，决定不在做爸爸的女孩儿，真正的步入社会，于是在其他老友的帮助下，她上路了，从二十多岁初入社会，到三十多岁成家立业，他们一走就是十年。十年间风风雨雨，在嬉笑怒骂中，在离别团聚中，他们向我们讲述着友情、爱情还有生活。让我们和他们一起开怀大笑或是黯然神伤。Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:Public Invoker (Command command) {3. The origins of names are different.Public class Context {