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The policy pattern defines a series of algorithms and encapsulates each algorithm so that they can be replaced with each other, and the changes in the algorithms will not affect the customers who use the algorithms. It is necessary to design an interface to provide a unified method for a series of implementation classes. Multiple implementation classes implement the interface, design an abstract class (optional, belonging to auxiliary class), and provide auxiliary functions. The diagram is as follows:爱若初见　　“凤凰男”夏志刚发奋苦读十余年，通过了千里挑一的公务员考试，在城市规划局当上了公务员，彻底飞出了山窝窝。一心想通过从政改变自己和家庭命运的他制定好人生规划，向处长局长的目标奋勇前进。By listening to some conversations, his ability to understand English has been improved better than simply watching many different movies to practice. Do one thing over and over again in order to find out where you are deficient.And sun chien's big move.