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Try the upper body effect after drying,You can see that volume/data has already performed the operation, and now start a container:4. Detecting SYN Attacks　　鞠县长的亲弟弟二团参谋长少剑波带兵火速援救夹皮沟，可土匪已逃之夭夭。反正咱的工钱不能少。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.