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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.电视剧《三军大会师》讲述了红军从1936年4月即将结束东征，红军一、二、四方面军历经西征、甘孜会师，北上、会宁大会师，将台堡大捷，重创国民党部队，展现了毛泽东、周恩来、朱德、彭德怀等一批历史风云人物，以及红军队伍中的铁家父子以及程家姐弟等一批小人物，他们在会宁大会师前后的坎坷选择和经受的历练等。End productAfter the real estate speculation boom occurred in Dandong, a small border town, at the end of April, the reporter rushed to the scene immediately and made three timely, responsive and better-than-peer reports through multi-channel interviews, reflecting the investigation ability and enthusiasm of the interface and the reporter in grasping hot events.Relying on automatic loading, the configuration is clear and concise.Public class Observer2 implementations Observer {讲述了男主角在分手的时候遇到了刚好也在分手的女主角，但是因为女的文化水平和工资都比他高，这俩很快就在一起了，正当要结婚的时候被周围的朋友说他是小白脸，然后故事就开始了……