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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:Recommendation, show the production content, including labor and algorithm(four) a sound fire safety assessment process control system;　　能承受什麽？一块橡皮引起的恋爱故事。青木暗恋桥下，桥下暗恋井田，而井田觉得青木喜欢自己？！三人的初恋结果到底如何呢。该剧以韩国轰动全球的未了结案件“华城连环杀人案”作为参照原型，并用当时嫌疑犯的绰号“岬童夷”作为剧名，虚拟城市日炭作为连环杀人事件之发生地，描述时隔20年再次回来的案件元凶岬童夷与不惜一切要缉捕他归案的刑警河武念之间所发生的故事。青年设计师秦放（张彬彬 饰）在一次寻根过程中，因一次意外与沉睡数十年的司藤（景甜 饰）相遇，在帮助司藤寻找身世真相的过程中，两人彼此相知并克服重重阻碍共同成长的故事。