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在业余球队打杂的少年程童童天赋异禀，一个大脚能把足球踢到令人不可思议的距离，被五星体院足球班新上任的教练任军挖掘，特招进入足球班。童童在五星体院的新生活中，和新同桌陈雅静不打不相识，从冤家变成了好哥们。童童结识了陈中、尚海瑞等一众好友，俘虏了女神夏雨的芳心，开始走出阴霾，性格变得乐观开朗起来。童童刻苦钻研、习得足球必杀技，屡次在比赛中力挽狂澜，成为足球班的大功臣。热血少年，青春无悔，面对着不可预知的未来，众人勇敢逆风奔跑，携手再逆一次青春！Unicom"Er... how do you say this, In terms of appearance, it should be regarded as common, but the physique is much larger than the common. The kind of rats that drill in the ground is a kind of big rats. They fly like big wasps in the sky. They are all in groups, and they are very fast and flexible. They are not easy to hit with guns. Once surrounded by them, they are basically finished. " Zhang Xiaobo said.This class can meet the basic requirements, but if we put a class like this without thread safety protection into a multi-threaded environment, there will definitely be problems. How to solve them? The first thing we think of is adding the synchronized keyword to the getInstance method, as follows:泱泱天道，强者无敌！上古丹法，照破山河万朵；焚天宝剑，湮灭宇宙轮回；修罗血脉，埋葬万界至尊。秦南得天命传承，修无敌之法，开启了一场碾压当世无数天才，通往万古不朽，称霸诸天的强者之路！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.