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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:另外——她顿了一下，慢声道——我还要搁些香荽，还要搁些小葱。天河魔剑录电视剧将于十月一日播放。此时此刻，他们不得不佩服张良的才智与长远的目光。简单客套问问夜里睡得好不好早饭吃的怎么样后，林朝曦直白道明了来意。这时，任杰感叹道：《武侠世界》杂志能有现在的销量和影响力，几乎全靠陈先生一人啊。Iterator pattern provides a way to access each element in a collection object sequentially without exposing the internal representation of the object, which can not only not expose the internal structure of the collection, but also allow external code to transparently access the internal elements of the collection. The specific structure diagram is shown below.