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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.一个是千年以前南扶余的最后一个公主，一个是将军世家的继任者，一个是心怀仇恨矢志复国的敌人，集结了一见钟情，互相钦慕，国仇家恨，许多恩怨于一体的复杂关系，这样的三个人所谱出的千年之爱，你能够错过吗?Ice Attribute Enhancement Pearl23分間の恐怖 賀来千香子 反田孝幸Next, we will listen to the onchange event in the drop-down box of colorSelect and the oninput event in the numberInput input box respectively, and then make corresponding processing in these two events.淼淼，你要改行了么，准备考状元？秦淼转头笑道：板栗哥哥笑话我。这当然不是值得炫耀的事，残留的记忆也不美好，那一个多月，走得她脚底板都起泡烂化了。