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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.道人轻轻点头。我们上次见到拉夫特一家已经六年了。戴夫和朱莉带着最小的女儿鲁比在乡下开创了新的生活，而年长的孩子们面临着新的挑战，爷爷泰德也在努力寻找自己的位置。由于戴夫享受着新获得的自由，朱莉必须协调好自己对家庭的责任。罗立夏天资聪颖，大学期间一直属于学霸级人物，出国留学毕业后在外创业，就在他以为登上人生巅峰，创业成功受到万众瞩目之时，却被合伙人陷害，一下跌入人生谷底。回国后罗立夏重燃创业之心，在几个小伙伴与政府的帮助下从零开始经历磨难和挫折后，迅速成长为新一代的创业领导者。Flaming Gun is an external skill that can add a panel.6.2 Reduce SYN-RECEIVED time赛车手阿浪一直对父亲反对自己的赛车事业耿耿于怀，在向父亲证明自己的过程中，阿浪却意外的卷入了一场奇妙的冒险。他在这段经历中结识了一群兄弟好友，一同闯过许多奇幻的经历，也对自己的身世有了更多的了解。