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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.22　　这部戏之所以走Foreign students generally cannot take the college entrance examination in Tianjin. First of all, you must have a Tianjin registered permanent residence, and you must handle it well in advance. Children cannot transfer to another school until they go to high school or Grade 3. If you don't have a Tianjin hukou, either it is the kind of social students who have a very narrow choice of major in the college entrance examination, or you will be sent back to your place of origin for the examination. Please consult me for details.42. X.X.104In real life, there are paper templates, resume templates, etc. In real life, the concept of template is to give a certain format, and then all other people who use template can implement it according to their own needs. Similarly, the template method is the same.