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Factory Pattern: Factory Pattern is a frequently used pattern. Classes implemented according to Factory Pattern can generate instances of one of a group of classes according to the provided data. Usually, this group of classes has a common abstract parent class and implements the same methods, but these methods perform different operations for different data. First of all, we need to define a base class. Subclasses of this class implement methods in the base class through different methods. Then you need to define a factory class that can generate different subclass instances according to conditions. After getting an instance of a subclass, developers can call methods in the base class regardless of which subclass instance is returned.汪直自封王侯，首选的媳妇，一定是其他王侯家的小姐，可大明的王侯再傻，也不会傻到跟徽王府联姻，日本、琉球的王侯又看不上，这首选几乎是没戏了。To get back to the point, At this time, I saw Zhang Xiaobo's expression was in high spirits. He was obviously very proud and relieved of his hatred for beating up the "killer bee" with the flickering armor-piercing bullet. Associated with his slightly melancholy expression just now, it was obviously not this one that made him melancholy. I was not the kind of person who liked to expose people's scars, but for work reasons, I still had to ask:霍启带着与后妻的小女儿霍聪，突然从乡下“闯入”前妻林珊家中，在林家引起了轩然大波。原来，十年前霍启犯下过失，不得不与林珊离婚。上初中的林然然因失去父亲，身心都受到巨大伤害。多年来，这一直是母女二人心头的一道伤疤。此番霍启以房子租期已到无家可归为由，带着霍聪回来，无异在林珊与林然然的伤口上洒了一大把盐。母女二人极端激烈的抵制，让霍启望而却步。这时，林珊的母亲--始终坚信女婿是被冤枉的前岳母，却强势出击，将霍启父女留了下来。原来，深爱女儿的林母，因为和比自己年轻的丈夫一生婚姻不幸，而强烈反对女儿与男友肖言的姐弟恋。此番霍启的回归，与她一拍即合。她希望促成霍启与女儿复婚。孝顺的林珊，在母亲各种攻势下，逐渐败下阵来，只得勉强同意霍启在家暂住三个月。　　为了主要讲述了一个雨夜，一个男子在加班回家的路上被一个新婚前夕的卡车司机撞死，死者留下了年迈的母亲，体弱多病的妻子以及两个不更事的女孩。后经发现死去的男子主要死因是心脏病发作。但肇事司机毅然担负起照顾这一家的责任，在共同的生活中，双方相互谅解，而司机的女友只能无奈地与他分手。司机和那个死者的妻子以及女儿之间先后产生了情感及爱情故事。最终男主角李青阳与容芳登记结婚，只是还没有办婚宴。故事收场，一条铁轨延续到远方，一个简单的行李和一个孤单的背影消失在视线的尽头。Private Vector < TreeNode > children = new Vector < TreeNode > ();