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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.Next, we will enter the code writing phase of the state mode. First, we will define three state classes, namely offLightState, WeakLightState and strongLightState. All three classes have a prototype method buttonWasPressed, which represents the behavior that will occur when the button is pressed in their respective states. The code is as follows:The diagnosis and treatment process and effectiveness of MDT should be subject to internal and external reviews (e.g. It is necessary to determine whether MDT diagnosis and treatment recommendations conform to current diagnosis and treatment guidelines and whether clinical trials have been considered), and clinical diagnosis and treatment behaviors should be optimized based on the review results.A5 Ear, true throat and oral cavitySouth Korean actress, representative works of "My Savage Girlfriend" and "You from Stars", speaks for Oppo R9s.　　然而生活远没有那么简单，肖童在一次玩笑中邂逅大毒枭欧阳天的女儿欧阳兰兰，这个任性的富家小姐立刻就不管不顾地爱上了他……Interpreter mode: pay attention to encapsulating changes in specific fields, support frequent changes in domain problems, express problems in specific fields into sentences under certain grammatical rules, and then construct an interpreter to interpret such sentences, thus achieving the purpose of solving problems.