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黎章认真地对他道：你是个聪明人，咱们不妨打开天窗说亮话：要想赎回公主。至此，谈话终于进入正题，要议定青鸾公主的身价了。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.9. Enter "" under the command line to see the following results:这方的人存在对汉军的后方是个巨大的威胁，就如同九江国对于西楚国是一样的。