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One problem with the factory method pattern is that the creation of the class depends on the factory class, that is to say, if you want to expand the program, you must modify the factory class, which violates the closure principle. Therefore, from the design point of view, there are certain problems, how to solve them? We use the abstract factory mode to create multiple factory classes, so that once new functions need to be added, we can directly add new factory classes without modifying the previous code. Because the abstract factory is not very easy to understand, let's look at the diagram first, and then it is easier to understand with the code.MTV台已经预订了《少狼》第五季。大爷尝着味儿不对，再一听是溏鸡屎，气得直往外吐，说小结巴故意害他，拿着拐杖满屋子撵着结巴打。Next, we will finish writing other codes. First, we will define the Upload class. The objects that control the upload process will be created from the Upload class:Only by changing the organization code needs to be unbound in the communications department system and then the CA is re-bound. Other content changes do not need to be untied.《不是钱的事》由赵本山率领小沈阳、于月仙、唐鉴军等“赵家班”成员主演，故事取材于本山传媒旗下辽宁民间艺术团里的真人真事。讲述了在深入推进文化体制改革的大背景下，银岭市民间艺术团由事业单位转制为自负盈亏的演出公司过程中发生的一系列啼笑皆非的故事。Step 2 Restrict detection