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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.DirectX version: 11从前张家救助人，也只会帮人家找一份工做，从没说把人接到家中当小姐少爷供着的道理。在有人神秘地将他的注意力吸引到了证据之后，一位无所畏惧的所得税官员袭击了勒克瑙最有权势的人的宅邸。情同手足的四兄弟，感情素来很好，老三在城里待不下去想回来发展，就找家里的几个兄弟。在回来的路上，偶遇一路人三哥和虎哥那一帮人，虎哥的人从车上掷下一个包本想陷害三哥他们的，没想到的是，这个包让老三无意间给捡到了。老三幸运的以为自己这么轻而易举的发了大财，这下可以在兄弟面前大张旗鼓的吹捧下自己了。就因为这一个奇怪的包，然而它却大有来头，它牵涉着另一帮人利益交易。这帮人互相猜疑追究，三哥也是不知道，就让自己的人去寻找这个包，这一路上，与那四兄弟认识，并出了很多搞笑的事情。就这样，四个兄弟莫名其妙的遭到了他们的追踪和调查，从而卷进了这场纷争当中。但在这紧要危难关头，四兄弟齐心协力，福祸共享，患难与共。Established in, sales have increased by more than 100% for five consecutive years, with an average price of more than 100 RMB and limited sales. It is reported that Stance is in心中全然没了喜悦，反而是无奈的悲凉。