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Iterator pattern provides a way to access each element in a collection object sequentially without exposing the internal representation of the object, which can not only not expose the internal structure of the collection, but also allow external code to transparently access the internal elements of the collection. The specific structure diagram is shown below.Telecommunications杰西（多米尼克·库珀 Dominic Cooper 饰）曾经是一名黑帮打手，金盆洗手之后，他回到了阔别已久的故乡，继承了父亲的教堂，成为了一名传教士。每一天，杰西都过着浑浑噩噩的生活，丝毫不将自己神圣的职业当做一回事，然而某日，前女友塔里普（鲁丝·内伽 Ruth Negga 饰）和爱尔兰吸血鬼卡西迪（约瑟夫·吉尔甘 Joseph Gilgun 饰）不请自来，彻底搅乱了杰西平静的生活。[Time of Publication] January 4, 2016Command mode belongs to the behavior mode of an object. Command mode encapsulates a request or operation into an object, and separates the responsibility of issuing the command from the responsibility of executing the command through abstraction of the command. The implementation of command mode can provide the functions of revocation and recovery of commands. The specific structure diagram is shown below.我愛冰冰ShowWeChat 3.6 adds the following main functions: