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After understanding the history and classification of design patterns, how should we learn design patterns? Before learning the design pattern, readers must establish a kind of consciousness, that is, the design pattern is not only a method and technology, but also an idea and a methodology. It has nothing to do with the specific language. The main purpose of learning design patterns is to establish object-oriented ideas, program to the interface as much as possible, with low coupling and high cohesion, so that the programs you design can be reused as much as possible. "Specious. Learning design patterns can better understand object-oriented ideas. Design patterns are some design skills and tricks. Don't rise to ideas and methodologies, okay?"1949年冬天，蒋介石和毛人凤妄图在大西南苟延残喘，与新生的人民共和国相对抗，在重庆完成了震惊中外的渣滓洞、白公馆大屠杀后，秘密来到成都，向麇集在这里上万的军统特务和各路特务，布置了“密裁、破坏、潜伏、游击”四大任务。于是，当我刚刚组建的年轻的人民公安，随解放大军进入成都这座全国最后解放的一座大城市的时候，便面临着极其严峻、尖锐、激烈、复杂的铲除残匪，肃清敌特，保卫人民生命财产，保卫新生红色政权的……周大也正是这样的想法，此战若是能够立下大功，之前的那些失误和罪过，以及一些不好的影响也就能够一扫而空了。当那些镇军向桃花谷开进的时候，就算这些人并无多少萧杀之气，军容气势都比不上边军禁军，那也让清南村的人看了发抖。尤其是软禁周徐两家，而没有轻举妄动是对的，这两家掌握着足矣影响到山yīn稳定的资源。不过仔细说起来，有些棘手的问题也变得更好处理了。Disadvantages: