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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.黑须鬼倭温柔地架起了他的武士刀，拿起细磨石，缓缓加水，以极柔的力道轻轻磨刀，口中嘟囔道：我们信服你，没有你，我们找不到敌人，没有敌人，我们不知道该怎样活下去。Don't rely solely on internal defense mechanisms胆子也越来越大了，将来能还原么？小雀和灵儿立刻浑身颤抖，丝毫没觉得疑惑：为什么不是这个疤脸少年自己睡她们，而是敬献给那个好人。主人公少年·新海春，获得了被伟大的意志引导的“App驱动”，并使来自“App芯片”的搜索App·盖奇兽实体化了。商场大亨乐家的儿子乐言（万梓良 饰）在美国留学期间，因为一起误杀罪被盼入刑七年。