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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.User2 exe!　　春节来 临，合家欢乐，田家却被哥嫂造的乌烟瘴气，恰好医院来电话，让文洁出诊去看一个危重病人，文洁终于逃离了家门。争吵之后，田母搬回来自己原来的房子，一 日，田母感觉血药升高，胸闷，打电话给文洁，文洁恰逢一个手术。穿越天玄界，开局竟是辣鸡门派掌门人！都市氪金人重生游戏异界，拿玩家当走狗，收世界主角做小弟，看我怎么走向人生巅峰。　　当温厚的盾面对卑劣的矛，当父亲是那个盾儿子是那个矛，会怎样？I looked back and saw that the cable was broken and the raft had drifted out more than 10 meters. I quickly took the rope and threw it onto the raft. The first mate picked up the rope and threw it back into the sea, saying that there was a knife hidden on the liferaft and they wanted to kill people! We're not going back!咱们这些庄稼人，没啥根底，一个村子出去的，从小打打闹闹的，也是情分哩。