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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.全世界陷入混乱，充斥着爆发的僵尸，只有强者才能生存。卢克和他的团队，是否有足够的野心和弹药来延长人类的生存时间？8.2 Electrocardiogram is obviously abnormal and unqualified.赵文华听得心潮澎湃：你就这么肯定能做成？杨长帆双掌一拍：做不成也毫无损失不是？赵文华闻言托腮沉思片刻：不是不行，但缺少关键的东西。Of course, the software design pattern is only a guide. In actual software development, it must be selected according to specific requirements:Density (g/cm3)这事未必没有可能，咱们先试探试探。