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In the above code, we use three functions, order500, order200, orderNormal to handle its own business logic, If the current own function cannot handle things, We pass it to the following function to handle it. By analogy, Until there is a function that can handle him, Otherwise, the responsibility chain mode will leave the chain directly, telling that it cannot be processed and throwing an error prompt. Although the above code can be used as the responsibility chain mode, we can see from the above code that the Order500 function depends on functions such as Order200, so there must be this function, which also violates the open-closed principle in object-oriented. Let's continue to understand writing flexible and detachable responsibility chain nodes.老的当然更开心，张大栓和郑长河合计，要叫赵三也一块回去，那才热闹。"Yes, it's the kind of big rats. They are more difficult to deal with than big wasps. Especially when these two things go together, one is in the sky and the other is underground. We should be too busy to take care of them. Moreover, the kind of big rats have very strong teeth. It's a piece of cake to bite off their arms and legs in three or two, and they move very quickly." Zhang Xiaobo said.Private String url = "jdbc: mysql://localhost: 3306/test";蓝皮鼠和大脸猫是魔奇杂技团的明星。经常外出演出，每到一处就会发生一个故事或一个奇遇。 蓝皮鼠聪明伶俐、助人为乐，善于动脑筋想办法，本领高超，却不甘寂寞，害怕委屈，不肯吃亏。大脸猫则憨态可掬，又馋又懒，喜欢抛头露面，却又胆小怕事，但有什么说什么，决不虚伪。他们俩共同的特点是既善良又胆小，既聪明又不太成熟。他们还有一对搭档叫金豆豆和绿方方，是一对甲虫，他们住在蓝皮鼠的耳朵里。徐阶依旧恭听，此言倒也不错，没有大明这个巨人，徽王府长不到这么肥。