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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.　人类在与地球相似的遥远外星建立了新家园，但这个星球上却有一种病毒，男人感染后可以听到其他人和动物的心声，每个男人脑子里的想法都能被他人听到，人与人之间不存在隐私，新星球上的普伦提司镇的男人们就不堪忍受自己的想法被人听见。ALT + MUP Extraction Contour1. The declared variables are read-only to the outside world. However, values of object types are exported and can be modified. ?"In short, it will be very fast and will not leave you much reaction time." Zhang Xiaobo said.该剧讲述了蓝水市大家族林家神秘案件接连发生，探长柯阳受命调查，却无意发现一系列案件背后有着不为人知的真相的故事。?