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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:黄豆急忙答应下来。After years of baptism, the collection is still full of tender memories.杨长帆却一声长叹，扔掉了手中的燧发铳，只短促说道：你死了，谁来打鞑子？戚继光依然没有迟疑：江山代有人才出。(two) the medical service behavior is partially true, but the declared quantity is inconsistent with the actual situation;　　CW又一次一口气续订多剧，这次共13部，包括《豪门恩怨 Dynasty》（S4）。