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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.父母去世后，Mahesh aka Mahi在美国长大，创办了一家名为Mahi Finance Corporation的贷款机构。当债务人不还钱时，他有自己的暴力方式来提取债务，在他爱上了一个名叫卡拉瓦蒂的女人之后，这种情况发生了变化，卡拉瓦蒂欺骗他为她的学习提供贷款，而实际上她是一个赌博成瘾者。在意识到这一点后，他试图从她那里榨取债务，最终回到印度，在那里他遇到了她的父亲Rajendranath，他是一位强大的国会议员和实业家，居住在Vizag。当试图杀死Mahi的生活时，冲突升温了，他透露他在那里提取的不仅仅是卡拉瓦蒂的债务。? This mode is an improvement on the common factory method mode. In the common factory method mode, if the passed string is wrong, the object cannot be created correctly, while the multiple factory method mode provides multiple factory methods to create the object separately. Diagram: