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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.公车司机阿泰（刘冠廷/饰），是一个动作慢吞吞、连手表的时间、地震的感应都比别人慢的奇葩。他每天都会去邮局，找柜员杨晓淇（李霈瑜/饰）寄一封不知道给谁的平信。柜员杨晓淇和阿泰完全相反，是个凡事抢拍的超级急性子，唯独感情生活毫无进展，年近三十还是母胎单身。情人节前夕，杨晓淇被天菜阳光男刘老师（周群达Duncan/饰）搭讪，终于情窦初开的晓淇和刘老师天雷勾动地火；想不到一觉醒来，刘老师再无音讯、而且情人节居然已经过了？！每天来寄信的阿泰也再也没出现过...毫无记忆的杨晓淇，开始了一趟寻找真相的奇幻旅程...Public void del (Observer observer) {李敬文愣愣地瞧着她，也没心思吃饭了，问道：纳鞋底可是费工夫的很，你能赶得急？还有，他十分怀疑，她还记得咋捉针么？回头一只鞋底她三五针就纳完了，穿到脚上三天就得散开，那可就麻烦了。该剧讲述了一位当地青少年揭开她家庭秘密的过去，并在南非一所高中的复杂世界中航行。　　现在，三人所选择的恶劣的爱情开始了！