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Some software developers always want to set up a certain design pattern when designing programs. In fact, this is wrong and they do not really master the idea of design pattern. In fact, many times readers use a certain design pattern, but they just don't know what the name of this pattern is. Therefore, when designing programs, we should use appropriate design patterns according to our own understanding.20,000 Yuan Zhao Xiaojuan's "Looking Back at 2008 ① 10 Years of Melamine, Dairy Industry Reshuffle and Difficult Confidence Reconstruction" Editor: Xu Yue《北京女子图鉴》以小城姑娘陈可怀揣梦想执意北上为开篇，她不断地经历选择和被选择，在更迭和得失之间，最终继续坚定地前行在北京的故事。一个条件普通的外地女孩来到北京，没有傻白甜、玛丽苏、靠男人解决危机、和姐妹反目等，女主陈可没有主角光环，每走一步都是教训和经验，每阶段也都有欲望和杂念，她不是需要膜拜和羡慕的大女主，只是在北京生存的你和我，不依附于他人，而是选择独立成长。北京让女性有机会坦诚野心，追逐欲望，这是一座应该被感谢的城市。让北漂的女子们感同身受，知晓身在异乡仍有人同行，女性成长需要相互鼓励陪伴。吕馨发出银铃般的笑声，拉着陈启走了出去。I am an ordinary teacher, The salary is not high either. The money invested is saved and saved by oneself at ordinary times. When I heard something happened to the investment family, I felt that I suddenly lost a lot of hard-earned money. It was hard to avoid heartache, but I could not sleep or eat, because I had certain psychological preparation before investing: investment would be risky and I was willing to accept defeat by gambling.Account Name: Jiangsu E-Commerce Service Center Co., Ltd.A program based on policy mode consists of at least two parts. The first part is a set of policy classes, which encapsulate specific algorithms and are responsible for specific calculation processes. The second part is the environment class Context, which receives the client's request and then delegates the request to a policy class. We first use traditional object-oriented to implement it.