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The definition of a policy pattern is to define a series of algorithms, encapsulate them one by one, and make them replaceable with each other.这也是范文轩，以及范家的长老们迟迟不作出决定的一个重要原因The difference between them is that each policy class in the policy mode is equal and parallel, and there is no connection between them. Therefore, customers must be familiar with the functions of these policy classes so that customers can actively switch algorithms at any time. However, in the state mode, the behavior corresponding to the state and the state has long been encapsulated, and the switching between states has long been stipulated to be completed. The "change of behavior" occurs within the state mode. For customers, they do not need to know these details. This is what state patterns do城市里备受父母宠爱的艾青爱上了农村出身的理发师李大力,李大力拿了艾青父母支援的启动资金和艾青一起创业,业务蒸蒸日上,李大力以不让艾青太辛苦为由,让艾青回家待孕。两年过去了,二人并未怀孕成功,随着婆婆徐春枝搬来同住,战争开始全面爆发。若是生了重病后果是相当严重的。胡家三闲汉在不远处见到了这一幕，本欲嘲笑一下骑驴者苦逼，可稍微仔细一看，这不是凡人。