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After creating some subclasses of Pizza, you can start testing:小葱在心里把泥鳅和李敬文默默地掂量一番，想着就挑敬文哥吧，梅子婶婶那么好的人，往后也好相处。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.Some Calculations of Akhan Scourge Flow夏正不假思索大笑道：东海之内，非船主的人，皆是败寇。《长牙》由安·玛丽·佩斯执导。