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As the name implies, iterator pattern is to access objects in an aggregation sequentially. Generally speaking, it is very common in collections. If you are familiar with collection classes, it will be very easy to understand this pattern. This sentence contains two meanings: one is the object that needs to be traversed, that is, the aggregated object, and the other is the iterator object, which is used to traverse the aggregated object. Let's look at the diagram:The reason why the blue blood flag and Wanfu Mo enemy are put together is that both skills can achieve the purpose of reducing injuries.网上已经有很多人在大喊老公战无不胜。If we need to do something later, we also need to write the called method in it. In this way, the code is highly coupled, so we now use the publish-subscribe mode to see how to refactor the above business requirements code."Well-how do you say this? According to the appearance, it should be a dog, but the dog is very ugly. I don't recognize what breed it is, and I have never seen such a fierce dog." Liu Guangyuan said.要绝对保证消息不泄露……竹笼装着大石头，一筐筐地沉入河水之中，没过多久一座规模不小的围堰已经建成了。你怎么才出来……陈启的声音突然停止了。