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The next four patterns, including this pattern, are all the relationships between classes and do not involve inheritance. When learning, you should remember induction and the diagram at the beginning of this article. The observer mode is well understood, similar to email subscription and RSS subscription. When we browse some blogs or wikis, we often see RSS icons. This means that when you subscribe to the article, you will be notified in time if there are subsequent updates. In fact, in a nutshell, when an object changes, other objects that depend on the object will be notified and will change with it! Objects are a one-to-many relationship. Let's look at the diagram first:由上海SMG尚世影业和上海蓝星影视联合摄制的大型女性情感史诗巨制《风和日丽》男女主角历时半年多的层层筛选，终于尘埃落定。女主角杨小翼由在《奋斗》和《婚姻保卫战》中名声大噪的青年演员马伊琍出演，男主角刘世军由在《士兵突击》和电影《唐山大地震》中脱颖而出的新生代偶像小生李晨担当。 　　《风和日丽》作为今年上海市委宣传部重大文艺创作项目之一，将在今年六月投入拍摄，该剧由金牌编剧林和平、泳群操刀、著名导演杨文军执导。该剧将横跨上海、北京、浙江三地拍摄，投资巨大，卡司空前，力求打造一出制作精良、故事感人的精品佳作。Surgery and internal medicine are similar to general hospital physical examination, and the passing rate of initial examination is generally relatively high.In the achievement of this famous Wulin hostel, the award has the word title at the end. Where is it displayed? Is there any bonus?说，到底怎么回事？不是之前就交代过嘛，即便是蒯彻当时没有答应，你们也可以直接将人给请回来的嘛。天夏高科技园，启明站办公区。The hotel has an independent park, convenient parking,