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The core idea is: when the state of the object changes, it changes its behavior at the same time, which is very understandable! Take QQ for example. There are several states, online, invisible, busy, etc. Each state corresponds to different operations, and your friends can also see your state. Therefore, the state mode is two points: 1. You can obtain different behaviors by changing the state. 2. Your friends can see your changes at the same time. Look at the picture:要不然到时候传出去，越王被人威胁离开，这人可就丢大了。上世纪九十年代末，煤市疲软，炎岭矿处境困难。老矿长李长寿病倒，煤矿也不得已停产。老劳模靳丑木一家人坐不住了，靳丑木跑到矿里发难，他的次子任一号采区队长的靳川又带着人要强行下井……围绕开拓与守旧的观念矛盾，矿山失去了平静。新矿长的竞聘工作井然进行，靳川临危授命担任了矿长。通过一系列大刀阔斧的改革：整治小煤窑无序滥采，整合煤炭资源，改造井下设备，等，炎岭煤矿走出低谷。年轻人之间的恋情围绕着矿山改造的进程渐次展开，炎岭矿在变革和阻力中，前进形势越来越好。何人荐吾。以虚构的“九州”世界为背景，徐徐展开一轴腥风血雨的乱世长卷。当这个世界就要崩溃，当星辰和阳光也熄灭，沉默已久的乱世之轮重新开始运转，乱世诸名将和未来的帝王们整备了盔甲，立起标志着各家徽记的大旗，去向不知结局的战场。