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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.黄雨萱，记得很清楚那一天，是2011年的夏末，她升上大学二年级的第一天，那一年的她和他，都是十九岁。Independent damage increase of 1 ~ n is the damage increase of Akhan suit, the damage increase of will barrier self-denial to ring suit, the damage increase of all-round ring suit, the damage increase of furnace special effect elite, the damage increase of prophecy blade special effect, the damage increase of Fred's anger special effect, etc.……今天的这一期《武侠世界》一出来，书友们、网友们都开始炸锅了。开门迎战。好容易我们回来了，才住两个月大姐就出嫁了。