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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:就回去面禀南灵王，代为分说，只要老将军放了公主，便既往不咎。In fact, not necessarily. The poor who have been caught in a vicious circle for a long time will soon become poor even if they become rich occasionally. The National Bureau of Economic Research of the United States has conducted a survey: in the past 20 years, the bankruptcy rate of European and American lottery winners has reached 75% within 5 years.一位喜剧片导演突发奇想，回到东北农村老家，希望将一家人如何过年拍成一部文艺电影，结果遭遇一系列意外。因拍电影而聚齐的家庭成员们，完成了最后的聚会。跟孤魂野鬼般游荡了一个多时辰，正要退回去，忽听二门外有人说话。