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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:Wonderful Reading: Symbols and Meaning of Time Relay叫香云的丫鬟莫名其妙：为我？赵锋诧异地问：他不是欺负你们了么？香云见蒋三被打得站都站不稳了，心里着急，气呼呼地说道：谁欺负我们了？你哪只眼睛看见他欺负我们了？赵锋道：那她哭啥？你又喊‘别跑。张槐便点头起身，道：也好。　　春桃东海龙王之女海兰珠来到人间布雨，在龙王庙偶遇侦破命案的沂州府衙捕头陆海笙，海兰珠假装失忆留在陆海笙身边协助查案，却因自己不平凡的龙眼而招来杀身之祸。反派势力为了得到一双不会腐烂的眼睛，对龙眼虎视眈眈，使用连环计让男女主之间误会至深，与此同时，陆府的雨荷也因海兰珠的到来倍感嫉妒，希望赶走她使自己的生活恢复如初，能有机会与陆海笙相守，两人联合对海兰珠制造重重困局。最终海兰珠究竟能否拿回自己的龙眼？两人的情感又如何在危机四伏中破局呢？