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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.朱县令即将离任，许多事还要请他结清才好。ABC已续订《戈德堡一家》第四季。其实，若是项声能够来的及时一些，反过来包抄了韩信和灌婴也未尝不可。When the program starts, empty and hide all, and when clicking on the stage, send out a broadcast:　　这是一部惊悚校园暴力题材的韩剧，主要讲述了在中学这个小小的社会里，那些顺应暴力和权力的人们被称为“猪”，讲述了他们带着自卑感和劣等意识在绝望中反抗的故事。动画片在各大颁奖典礼备受瞩目。洪熙官（甄子丹）嗜武成性，喜欢打抱不平。父亲洪亭南（潘志文）是朝廷武官，暗地里的身份却是反清福明的领袖赤龙，身份败露后，洪家家破人亡。为了报仇，洪熙官和高进忠（甑志强）、童千斤（梁日豪）一起到少林寺拜师学艺，途中还结识了不打不相识的方世玉（张家辉），没想到高进忠背叛少林，并将少林寺毁于一旦，练成洪拳的洪熙官最终为民除害。