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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.只要努力不懈梦想一定会实现──。现在只需要朝著那闪耀的目标，奋不顾身地勇往直前就行了！从此，少女们“ 大家一起实现的故事”（学园偶像计划）就此展开！Note: Do not decompress after downloading, drag the compressed package to the hakchi2 window.数学教师尤曙光十几年如一日照顾着昏睡的植物人老婆赵迎春。突如其来的拆迁问题难住了尤老师。王建强感叹现在的项目和人都不靠谱，王建强偶然和女朋友孙若楚聊天的时候得知，若楚的弟弟是一个在圈内知名的民谣歌手，王建强通过投资人的思维察觉到，做他们的经纪人或许是个不错的项目。This kind of story and details are everywhere in this book. Historians know that the modern history of China is a dry fact, and the aspects provided by Aban, from the unique perspective of American journalists, are fresh and juicy, and are not well known to us or common to us, thus filling in the gaps, providing references and making history fuller and more complete.周菡傻傻地接道：这可不行。