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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马列文（陈建斌 饰）是一位实体书店的守望者，他的梦想就是开办实体书店，让城市中的人们有可以沉下心来享受阅读乐趣的一方净土，因而不惜牺牲商业利润来守护精神家园。出于责任，他照顾着身患躁郁症的前妻王忆如（刘威葳 饰），而家庭教师简单（梅婷 饰）的出现为他的生活带来一丝慰藉。简单原是一位中学教师，辞去教职来北京与未婚夫冯春生（涂松岩 饰）结婚却惨遭背叛，简单在马列文的提点下勇敢拒绝了委曲求全的婚姻，并和马列文之间产生了莫名的情愫。马列文复杂的家庭关系使得二人虽已心意相通却彼此克制。而此时马列文前妻病愈归来想要复婚。面对责任、爱情以及岌岌可危的事业，马列文没有选择逃避，决定牵起简单的手，共同面对，最终战胜困难，实现了一直守望的梦想，收获成功，感悟幸福其实很简单。吸引他眼睛的却是那动人的舞姿……没错，香huā丛中，一位女子正在翩翩起舞。Next, overwrite the Light class, and now instead of using a string to record the current state, use a more three-dimensional state object. Create a state object for each state class in the constructor of the Light class, so that you can clearly see how many states there are in the light. The code is as follows:朕听说，谓天下才，唯有三人。1962年夏天，麦收时节，地主佟善田（佟大方 饰）暗中散布谣言蒋介石要回来了，当时正值蒋介石叫嚣反攻大陆时期，谣言在部分落后社员心中引起波动。饲养员庆奎（李宝岩 饰）与妇女主任玉芳（魏喜奎 饰）向队长玉柱（黄坚 饰）建议撤掉佟善田的车把式职务，并告诉他老地主向儿子传授变天账，玉柱听后将信将疑，他以生产太忙为田不肯撤换佟善田。支部会批评了玉柱的错误思想，由庆奎接手赶车任务，佟怀恨在心，他唆使二赖子（王凤朝 饰）在桥头扛打辕马，企图制造车毁人亡事故。关健时刻武装部长（刘文增 饰）带民兵及时赶到，查明原因，逮捕了佟善田，并查清了他十三年前杀害贫协主席的罪行......