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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:然后，他带着弟弟们和黄初雨下楼，在一楼大堂又把这话高声喊了两遍，说是请在场的客人做个见证。/congrats (Congratulations)WeChat Duokaibao一个十三四岁的女孩往矮榻上一坐，诧异地对香儿道：这丫头。老鼠娶亲过大年，进了洞房就生崽，子孙满堂，福！　　然而还有更大的阴谋在背后蠢蠢欲动。韩午阳要找回失落的爱情，要洗刷掉强加在自己身上的不白之冤，要和战友们一道挫败敌人的一桩桩罪行和险恶计划……