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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.少爷，你这真玉米回来了，媳妇当然该归你了。In fact, WCF content has been read very early, and many predecessors in the blog park have written it very well. However, I think I still need to summarize it myself, because only in this way can knowledge be my own, and how well others write it, after you read it, it is actually someone else, so I encourage you to make a few points (for these points, it is also a reminder to yourself):尹旭纳降的事情众人都有所耳闻，此时听到项羽的举动，都嗅到了异样。　　与此同时，人工智能中的邪恶力量也在觉醒，他们策划了一场恐怖绝伦的入侵阴谋，矛头直指那颗美丽的蓝色星球——人类的最后家园！危机四伏之际，最神秘的异星历险猝然开启，最疯狂的拯救行动也随之展开！为了生存，星际探险员们将作出怎样的艰难抉择？恩怨交织，流落荒芜星球的英雄们命运谁主沉浮？更有神秘红色精灵，光之星米瑞斯的归宿究竟在哪里？浩渺星系，机械迷城，深层宇宙空间里那些高度发达的人工智能，又隐藏了多少不为人知的秘密呢？历史上不乏这样的先例，可以说是屡试不爽。