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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.我家兄弟多着呢，他们也不会舍不得。而且两部军队都是离开他们原来的土地，这更是一个大好的机会。对，在下一向喜欢漂亮的。论文舞弊和研究费的挪用…现在日本的大学和研究机关发生了各种各样的事件。短时间内，越王尹旭应该会出于一种蛰伏之中。Showtime宣布制作《低俗怪谈 Penny Dreadful》精神续篇剧《低俗怪谈：天使之城 Penny Dreadful: City of Angels》，该剧由母剧的主创﹑编剧兼执行制片John Logan继续负责。