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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.几个北漂女孩作为一个女子跳唱组合，共同追逐梦想，不断成长的故事。 她们因梦想相识，因努力相知，从最初的一盘散沙，到后来的同心协契，团结一致。　　安晴BIM also has the function of quantity statistics to determine the amount of building materials used for preliminary cost analysis of construction units. The traditional method is that the construction management personnel fully understand the design intention and then convey it to the construction workers. Relatively professional terms and techniques are difficult for the workers to fully understand."今天一定要捉弄高木同学，让她害羞！"某所初中里，邻座女生高木同学总是捉弄男生西片。西片为了反过来戏弄高木同学，每天都在奋斗着……高木同学和西片的全力"捉弄"青春之战就此开始。江南长生会为贩卖长生经（保险）举行招聘会。负责人萧萧刀（何赛飞饰）却在招聘会上发现老板梅龙的独生女儿梅小瑶（马伊俐饰）。小瑶不满会中人浮于事，希望建立自己的力量，实行改革。她把刚出师的马小虎（孙耀威饰）也拉入了长生会。长生会的竞争对手--为老堂为争夺业务，不择手段，弄得百姓非常不满，激起小虎等人的正义感。他们在与不老堂的竞争中深深了解对方，也结交了不老堂的朱元、酒楼卖唱的花解语（王艳饰），几人之间产生了错综复杂的情感纠葛。