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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.3.12剧版《汉娜》续订第2季。第1季3月29日在亚马逊上线，虽然没有公布观看量，但亚马逊表示收获了“巨大的回应”。言下之意，有事随时能照应。《终极蜘蛛侠》第四季完结，被新《蜘蛛侠》动画系列取代。由Classic字幕组译制。华夫人：‘一日丧命散是用七种不同的毒虫，再加上鹤顶红，提炼七七四十九日而成的，无色无味，杀人于无影无踪。马里兰州德瑞镇，是一座籍由伐木业形成的城镇。但从建镇那天起，这里似乎就有一个小丑（Tim Curry 饰）存在，但他绝非善类，反而以残害儿童为乐。