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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:小葱追问：陈伯伯，那个小姑娘呢？陈鲨被大苞谷救过，这我们都知道，那小姑娘是谁？陈老爷道：那小姑娘叫珊瑚，是陈鲨的妹妹。打破男生的垄断，在探侦领域出现了“女生宿舍”，4位美少女组合，她们各个身怀绝技、聪慧过人，在《探侦学院》里尽展她们的才华。故事发生在一个虚构的城市——福尔摩市，那里有一间专门训练侦探、教授破案技巧的“金甲虫探侦学院”。而本故事的主人翁是四个背景不同、性格各异、目标不一的少女。四个探侦女生寻求一个个疑团答案，而每一个答案都是一个新问题，她们大胆假设，小心求证，为探侦技术而积极探索，并将探侦融入生活……芦屋瑞稀是在美国长大的日本侨生，因几年前在美国时被不良份子掳走，幸好有佐野泉救了她，但佐野泉也被割伤了韧带，自此不再跳高，瑞稀很崇拜他，亦为了补偿自己令泉不再跳高，为了想更了解泉和帮助泉再次跳高，瑞稀便决心转校到泉就读的日本樱咲私立高校，但由于樱咲私立高校是一所男子学校，瑞稀便扮成男生进入该学校就读。幸运地，她和泉就读于同一班，并且连宿舍都选择是同一个房间，但佐野泉从一直都不受瑞稀的努力劝喻，到慢慢开始重新跳高，都是因为瑞希而泉的好友中津秀一则喜欢上了扮成男生的瑞稀，导致可怜的中津以为自己是同性恋……The responsibility chain pattern describes how requests are passed along a chain of objects. It forms objects into a chain, and the sender sends the request to the first receiver of the chain and passes it along the chain until there is an object to process it or until there is no object to process and it remains at the end of the chain.　　法王施计欺骗国王要治好公主的病必须得到灵山草人，于是国王下令号召所有人寻找草人，穷小子张翔（刘锡明）无意中遇到草人并搭救了仙仙，并与其相爱。