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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:New Upgrade of Program to "40th Anniversary of Reform and Opening up"Lin Xinru: Spokesman for 120 yuan Hong Kong Dollar Chen Hao Every Year: 1.6 Million Every Two Years你别跟他过了，跟我回去吧，徐晴抓着他的衣襟，担心地说，他肯定不爱你，不然怎么能下得了这么重的手？Daddy也很想你，只要你回去他就不生气了，跟我走吧。或者是真看不出，你竟然是一个国术高手。……嘉靖感觉脑仁开始疼了，明日召首辅同来定夺。