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Iterator patterns are created for collection objects, For collection objects, It must involve the addition and deletion of collection elements, and certainly supports the operation of traversing collection elements. If the traversal operation is also placed in the collection object at this time, the collection object will bear too many responsibilities. At this time, the responsibilities can be separated and the traversal of the collection can be placed in another object, which is the iterator object.Written in this article: Xia Junshan　　他们的爱情注定是悲剧吗？即使不被祝福、即使没有明天，阿岳还是勇敢地爱著小鹿……郑长河知道他还在气周婆子，忍不住嘿嘿笑。5. A photocopy of the Notice of Approval for Enterprise Information Change issued by the Administration for Industry and Commerce and stamped with the official seal (only the three certificates are not provided in one, such as the change of information such as the name of the unit)