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The policy mode is the packaging of the algorithm, which separates the responsibility of using the algorithm from the algorithm itself and delegates it to different objects. Policy patterns usually wrap a series of algorithms into a series of policy classes. To encapsulate the policy pattern in one sentence is to "encapsulate each algorithm into a different policy class so that they can be interchanged". The following is the structure diagram of the policy mode:见杨长帆没有表态，何永强咣咣咣三个响头下去：只求放过我家人。可是他不敢去和刘邦计较，也没了那个心境说什么，话是自己说出来的。　　故事从天真开朗的露露公主遇到一个和自己完全不同的男人开始，露露公主从他身上学到了普通的生活，并抛弃自己注定的人生，开拓属于自己的人生。"That 's for sure, With the fire shield of the gun group returning from the reverse direction, Then the "day" will not be sad, No matter how many enemies there are, Also can't rush the "no man's land" formed by the shell coverage, In addition to the comrades who died, Both Zhou Xiaolin and Jiang Yong are quite regrettable, One of them was missing a leg, One without half an arm, Although they all fainted from pain, But when I woke up, one leaned against the wall of the trench and one armed with one hand still insisted on fighting until the best moment. They were all good... "Zhao Mingkai was the same as other war veterans I interviewed. At the end of the day, he was also a little emotional and his resolute lips trembled slightly. I knew he was trying to control his emotions and didn't want to cry.2. The policy pattern provides an open-closed principle, making the code easier to understand and expand.简介：许宁馨是一个平凡的长白山下的小导游，一场车祸让她意外重生在另一个时空的长白山下。