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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:Zhang Jie, born on December 20, 1982 in Chengdu, Sichuan, graduated from Sichuan Normal University, is a mainland pop male singer and founder of the music brand "Planet Culture".却说钟离昧回去的路上，听到营帐一侧有人说话：你听见没，那个淮阴人怎么说，章邯的目标是齐国，真是可笑……另一个声音响起：是啊，秦军正和我们楚国打的火热，怎么回事齐国。魏铁心里一哆嗦，他想起了火烧大雁山。　　“荧屏第一母亲”彭玉在剧中出演一位大小事儿都态度明朗，说起话来掷地有声的妈。老来俏的妈妈年届七十，谈起恋爱丝毫不输年轻人，恋上一个比自己年轻十岁的“男朋友”。秦基周饰演李泰梨一角，受妈妈的影响，梦想着成为演员，虽然遇到了残酷的事件，但最终成功成为演员。