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哦……是么……呵呵……杨寿全反倒有些不好意思，哎呀太威风了，为父好赖管理本村事宜，儿媳尽可放心，在村内大可挺胸抬头。我懂了……吕馨眼神闪动，若有所思。Public class SourceSub2 implementations Sourceable {你们也不必劝我了，我的命都是写好的。Decision Format: @ Streamer-Platinum她是机场安检，安全检查是她的义务和责任，而这次她检查的人，却是她熟悉又多少次魂牵梦萦的脸……与曾经深爱之人再次重逢，有多少尽在不言中。The reason why the logic for creating an object is put into a separate class is that it can be used by multiple clients. And separates the creation and use of objects. However, this design also has many defects. First of all, SimpleFactory is a specific class, so we must program for the implementation, making the system lose its flexibility in this respect. Second, if we add new products, we have to modify the code in SimpleFactory, which violates the opening and closing principle. The above model is also called simple factory. He does not appear in GOF mode, it is more like a programming habit.