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这一天，陈启和往常一样打开电脑。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.-Just out of the comfort zone, don't leave too far, go too far into the panic zone, in the panic zone is very difficult for people to stick to, just stand on tiptoe and encounter the range is the most suitable.4. There is no infectious disease, and I and my family have no history of mental illness.正是因为自己认出了断水。怪不得你又是拼又是连的。