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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.　　版本二她有些奇怪地问道：大爷，你们家怎么就不收留客人住宿呢？我们会付住宿费用的。其次，这个假玉米是白县令专门培养出来送给张家，冒充张家三少爷，以图谋不轨。Public int size ();永平帝实在喜欢他，便提拔他做了户部侍郎，正是原先准备委任张杨的职位。