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Understanding Factory Method Patterns: All Factory Method Patterns are used to create objects. The factory method pattern encapsulates the object creation process by letting subclasses decide what the created object is. The factory method pattern has the following roles:The configuration of this game requirement is very low, and basically the home computer can be competent.? ? ? ? ? ? Yum install-y yum-utils如此说来，楚汉和谈只是个幌子，是汉王的计策？尹旭沉声询问。前方高能！被警察事业耽误的演员来了！江苏常州新北公安分局制作《民警李建国》系列短剧，人物设定暂定四人，分别是派出所教导员，民警李建国，警花黄淑芬，民警王钢蛋...均由基层一线的民警辅警出演。PS: In fact, I have seen all the design patterns a long time ago. However, I didn't write a blog, but I soon forgot it and didn't play any role. This time I summed it up in the form of a blog, and found that the effect was still obvious, because through this way of summarizing, I understood it more deeply, remembered it more firmly, and affected my thinking of realizing functions at ordinary times. Therefore, I encourage everyone to sort out what they have learned by taking notes, so that I believe they can understand it more deeply and better. I will write it down all the time and then plan to write a series of WCF articles.