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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:当今各种交友软体推陈出新，约炮文化盛行，人人都只想要谈场速食爱情。生于千禧世代的马汀和盖比因为交友软体而相识，随即陷入如胶似漆的热恋期，感情却随着时间过去越趋平淡，两人都迫切渴望拥有新的刺激。身处在这个充斥“开放式关系”的花花世界里，这对情侣究竟能否维持“稳定交往中”的感情状态，还是会彻底迷失在选择泛滥的社群网路之中……尤其是在帐篷之中，鸳鸯帐暖，更是别有一番滋味。《果然是掉链子刑警》是NHK BS Premium制作的日剧，改编自藤崎翔的同名小说，由山本大辅执导，于田学担任编剧，风间俊介、犬饲贵丈、石川恋主演，于2019年5月5日开播。白凡叹道：他在这个秋霜的帮忙下，晚上偷偷地去了城中一条河边，顺河游出城去了。二更求粉。一阵拖椅子搬凳子的响声过后，寒暄了几句话，就说起丢了孩子的事来。