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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:Hee hee heeFourth, due to the need to monitor teachers' course arrangement and class attendance online, with the increase in the number of students, the technical requirements for teacher management are higher.This is it for the time being. Let me have some experience.灾难降临地球后，执行潜艇研究任务的海洋生物学家必须与队员们一起为生存而战。此时，一个阴谋浮出水面。林海知道。In addition to the traditional cowhide belt, there is also a magic belt with stepless speed change.