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The above is only a model of "Long En" bicycle, If you need to generate other types of bicycles, Other subclasses can be written. The most important advantage of factory mode is that some of the same methods can be implemented. We can write code in the parent class for these same methods. If we need to implement specific business logic, we can rewrite the parent class's methods in the subclass to implement our own business logic. In terms of professional terms, there are two points: First, weaken the coupling between objects and prevent code duplication. Instantiating a class in a method eliminates repetitive code. Second: Repetitive code can be written in the parent class. Subclasses inherit all member attributes and methods of the parent class. Subclasses only focus on implementing their own business logic.盟主不过是一个虚名，给刘邦便是了，有何不可。According to Article 4 of the Provisions on the Composition of Total Wages:A young woman abandons a choice job at a law firm and her life in New York in an attempt to find love in the unlikely locale of West Covina, California.还是范亚父理智啊。有了飞剑，周青的胆气顿时足了不少，正式走进繁华都市背后，那个不为大众所知的修炼者世界……郭寒的粉丝看完这章后，顿时高兴不已，就这样生硬无聊的情节，就这样平淡粗糙的文字，《佛本是道》也想和精雕细琢、文笔优美、辞藻华丽的《魔都》争锋？天启徒负虚名，实则小学生水准尔。3. Refactoring code using policy mode