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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:看完通宵电影，从电影院回到工地门口，喜良被工头叫到了医院。垂危的工友刘根用虚弱的声音托付喜良，希望喜良能把自己的骨灰和儿子小宝送回老家。看着曾经朝夕相处、同甘共苦的刘根……　　小鹿对丁健暗生情愫，而丁健也渐渐为小鹿的单纯打动。丁健爱上了小鹿，然而他却意外了解到，小鹿年幼时曾做过心脏移植手术，她短暂的生命不久就将走到终点……十佳导游竞赛就要开始了，小鹿将如何面对这一切？她还能鼓起勇气参赛吗？谁能让青春无悔，如烟花般灿烂绽放？小鹿同丁健的恋情将怎样继续？生命究竟有何意义？真爱能否带来希望？本剧给出了完美的答案……以三个性格迥异的儿子为中心，透过经历结婚和离婚，悟出婚姻的真谛！便没有理由拒绝玄武王的要求，何况云雾山屠杀案太惊人了，于是命王统进京。罢了。　　国共一场大战，国民党军全面溃败。众人都想登上太平轮，离开上海去台湾。这艘船成了最后的希望。没想到，意外的沉船改变了所有人的命运，船上近千人绝大多数都在海难中遇难，几位主角能逃过劫难吗？