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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.电影讲述一群生活在加拿大小镇的孩子，在寒假来临时，为了打发无聊的时间，小男孩卢克和刚到搬到镇子上的小女孩索菲亚成为对立两派的首领，约定了一场超大规模的雪仗。雪仗的规模在两方孩子们的挑衅、误会等碰撞中不断升级，进而演变成雪堡保卫战，最后导致了意想不到的事故发生。这个事故最终停止了孩子们的战争，并让孩子们认识到了自己的错误，找到了游戏的真谛，即友情和快乐才是游戏的目的，于是，所有的孩子都在这个过程中醒悟并得到了成长。富家子弟学津（刘德华 饰）自命不凡，多次恋爱后均迅速对对方无感觉，经常在订婚分手。这次，学津看上了来自上海的女服务生文青（瞿颖 饰），文青大方得体，和学津以及他的家人朋友都很聊得来。于是，学津准备与文青一起乘豪华邮轮作远洋旅游，并在船上举行盛大的订婚仪式。The iphone 4 can enter recovery mode by connecting to iTunes.Return num1;小葱打量了一番含泪的春花和鼓着嘴的绿竹，点点头对绿竹道：你去叫小草绿荷她们来，帮一把手。大家都笑了。