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Each object has its corresponding state, and each state corresponds to some corresponding behaviors. If an object has multiple states, there will be many behaviors. Then the judgment of these states and the behavior completed according to the states will lead to multiple conditional statements, and if a new state is added, the existing code needs to be changed. This kind of design obviously violates the principle of opening and closing, and the state mode is used to solve such problems.不仅如此，他们虽然没穿戏服。1. State patterns define the relationship between state and behavior and encapsulate them in a class. By adding new state classes, it is easy to add new states and transitions这地方，热起来就跟在炉子里烤一样。最终，鲁三还是没有受刑。《你好喵室友》是由中汇影视出品，郑云龙、马伯骞、杨天翔、李昊、蔡维泽主演的高萌暖心治愈陪伴剧。抗日女学生陈怡是一个在革命道路上逐渐成长起来地优秀青年。从慷慨激昂地热血学生，到成熟稳重的革命战士，甚至执行任务的时候还要扮演性格大胆奔放的交际花，打入到敌人内部获取情报。在做情报工作时，与搭档张楚扮假夫妻，多次身陷险境命悬一线。周卫国原本是一名玩世不恭的富家子弟，却不乏热血，抗战时为了保护初恋女友，举枪杀了一名日本人，由此改名换姓走上了革命道路，从国民党中央军校到德国军校，再到回国创建中国第一支特战部队，成为了一个真正的传奇英雄。