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Let me explain the role of these classes: MySubject class is our main object, Observer1 and Observer2 are objects that depend on MySubject, and Observer1 and Observer2 must change when MySubject changes. The AbstractSubject class defines a list of objects to be monitored, which can be modified: add or delete monitored objects, and when MySubject changes, it is responsible for notifying the objects that exist in the list. Let's look at the implementation code:I waited quietly for a while. Zhao Mingkai recalled it and organized the language. Only then did he open his mouth and said:1960年代，一列满载各界旅客的502次火车徐徐开往江城。列车乘务组由十三个年轻姑娘组成，共产党员裴兰英（卢桂兰 饰）是列车长。入夜，骤起狂风，往火车站赶车的解放军某部林营长（盛林中 饰），发现一棵被风刮倒的大树横卧在铁轨上，他搬了几次，大树纹丝不动，却被飞来的石块击中头部，他昏迷过去。502次眼看开过来了，苏醒过来的林营长顽强地站在路基上，用手电筒发出紧急停车信号。列车停稳，他被抬上列车，经医生检查发现，他伤势严重，需尽快手术。裴兰英紧急请示铁路局，要求将502次列车改为“特快列车”， 抢救林营长的生命。路局打破常规，沿站临时调度，502次列车飞奔江城.....他是认真学习经历过高考的男人，虽然有幸成为海事学院研究生，但从成绩排位上来看，他从未在最顶尖的部分中，按照现在的情况来看，大约每三年有300位左右的进士出世，每年100位上下，粗暴地与研究生或者高考进行对比，杨长帆连全国前1000都没进过。这天晚上，哑巴和尚和中年和尚都坐在板栗房门前，一直念经。虽然她能吃得起苦，但为了这个。