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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:File size: 14.85 MB　　《影子爱人》采取三条线索叙事，除张柏芝、权相佑这一对外，井柏然与张韶涵饰演一对在二战期间相爱的情侣，这段逃亡中的爱情直接影响了张柏芝与权相佑的爱情走向，而丁春Attention: Please click "Oriental Education Times" under the main title of the article.你若开城投降，我保全北京安然无恙。横跨阴阳两界，完我前世今生！漂亮、聪明的女鬼聂小倩奉鬼姥之命去勾引才貌双全的书生宁采臣，不料两人却暗生情愫、互相倾慕；而宁采臣偶然得知聂小倩就是自己傻媳妇良工的前世时，更下定决心为小倩报仇，帮她摆脱鬼姥，还阳人世。侠士燕赤霞秉师命去济南找知府王化成报仇，并从王府寻回自己心中的爱人宦娘，而宦娘却对宁采臣同窗吕子凯情有独钟。阴险狡诈的吕子凯为扫除自己仕途上的障碍，与王知府、鬼姥共谋害宁采臣、燕赤霞……