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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.Class has only one instance. Q: How can we guarantee it? Answer: Private constructors are used to ensure that classes cannot be instantiated outside the class.雨涵忍痛离开俊杰，带着一个不为人知的秘密远走他乡。苏老太为了让这个曾经显赫一时的苏家不至于败落，用心良苦将俊杰留在身边，让他学习打理面粉厂。SynAttackProtect Mechanism如是没有他们的配合，想要顺利掌控一座城池并不容易。该片讲述了无法继续在一起的夫妇为了幸福而发生的喜剧故事，权相佑饰演内衣公司营业部科长“赵贤宇”，李贞贤饰演翻译“朴善英”，李钟赫饰演动物医院的医生“安相哲”，电影将真实的反应韩国成人男女的现实生活。