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Factory Pattern: Factory Pattern is a frequently used pattern. Classes implemented according to Factory Pattern can generate instances of one of a group of classes according to the provided data. Usually, this group of classes has a common abstract parent class and implements the same methods, but these methods perform different operations for different data. First of all, we need to define a base class. Subclasses of this class implement methods in the base class through different methods. Then you need to define a factory class that can generate different subclass instances according to conditions. After getting an instance of a subclass, developers can call methods in the base class regardless of which subclass instance is returned.Disadvantages of Publish Subscription Mode:《DC明日传奇》(DC's Legends of Tomorrow)是一部由CW电视网筹备推出的第三部系列剧，该剧主要讲述了单单依靠英雄的力量已经不足以应付这样的危局…这个世界需要传奇，拥有时空穿越能力的时空猎手已经见到未来发生的一切，他绝望地想要阻止这一切，为此他只能召集由罪犯和英雄组成的一支超能团队，试图阻止这无法阻挡的灭世威胁。……次日晨，俞大猷戚继光进行最后清点。第三集The Flash：Season 6 -Episode 9Crisis on Infinite Earths: Part Three