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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.影片讲述的是美国前总统约翰·肯尼迪在1963年11月22日遇刺身亡的前四天时间里，发生在前第一夫人杰奎琳·肯尼迪身上的故事。娜塔莉·波特曼将出演杰奎琳，也就是Jackie。据该片的全球联合出品方和制片方熙颐影业透露，对于主创团队选择娜塔莉·波特曼出演杰奎琳·肯尼迪，业界并不感到惊讶。除了她精湛的演技之外，更是在于她独特的知性气质。幕后制作：招弟无法，只得接了点心出去了。天叔、贼仔、头皮、阿邦、阿华五个警察属同一小组，五人工作上配合默契，屡建奇功，被称为“金牌五虎将”。人皆有私心。