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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.　 一件事情阻止了他们的计划。一个两岁的孩子，被称作“狡猾的斯莱”，从她秘密的实验室里跑走了。他的出逃对他们的研究和计划有很不利的影响。在斯莱躲避Many years ago, there was a product form called community + e-commerce. In my opinion, it is too difficult to do this fact well. It is already very difficult for communities or e-commerce companies to do a good job in one category. You can imagine this difficulty if you want to mix these two things together and do a good job.The element being processed in the currentValue array皇帝气呼呼地看着他，并未赞他处置妥当，似乎怪他多事，害他没台阶下，忽然又大喝道：把梅子寒也押回来——焉知他没有参与此事？汪尚书急忙应下。We know that when the transmission control protocol establishes the connection, the TCP three-way handshake will be carried out first. In this project, when the server receives the SYN connection from the client,