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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."Well-how do you say this? According to the appearance, it should be a dog, but the dog is very ugly. I don't recognize what breed it is, and I have never seen such a fierce dog." Liu Guangyuan said.PreventDefault ()(2) According to the voltage of the controlled circuit to select the voltage of the time relay suction winding.幕后花絮：In fact, in the past two years, not only has online children's thinking ability training been highly praised by capital, but also interactive game APP and offline mode training institutions related to thinking ability training have received financing one after another.嘉靖深知，这样的海瑞，绝对是一位忠臣，天下第一忠臣。