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[Time of Publication] January 4, 2016刘家人听了自然不是滋味。Http://www.jiemian.com/article/2063210.htmlOne 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.前两处本来都是天下聚焦的热点，但是当大江之南打起来的时候，天下的注意力似乎全都被吸引到了彭蠡泽以西的那片土地上。等玄武王来了，看他敢把皇上怎么样。二来他就是要激发百姓的共鸣和愤慨之心，算准了会是这个结果。