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Class has only one instance. Q: How can we guarantee it? Answer: Private constructors are used to ensure that classes cannot be instantiated outside the class.我就说，我在人前当然不会爬树骑牛了，是在自己家园子里才这样的。凭着武侠剧的热潮，凭着原小说的人气，凭着江南卫视的大力宣传，就算是《白发魔女传》质量一般般，收视率也不会低。The 23 design modes, in fact, the predecessors have summed up the ways to solve the problem. Their aim is to ensure the low coupling and high cohesion of the system. The principles guiding them are nothing more than the design principles of packaging change, single responsibility, interface-oriented programming, etc. After that, I will continue to share my WCF learning process. Although there are many WCF series in the blog park, I felt that it was not necessary to write them before, and I felt that I could use them. However, I did not write them. I always felt that the knowledge was not my own and I did not feel in-depth. Therefore, I still want to write such a series. I hope all bloggers will support me more.当医生来敲门，健康的人都成病人，不管小病还是重症，能够赚钱都是好病人。Package com.xtfggef.dp.state;Return new Memento (value);