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Responsibility chain mode-A request needs multiple objects to process, thus avoiding the coupling relationship between the sender and receiver of the request. Connect these objects into a chain and pass the request along this chain until an object processes it. The specific structure diagram is as follows: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.　　钟小飞的死深深刺激了李春天。梁冰偶尔看到报纸上关于钟小飞的报道，大惊失色。他找到李春天，希望了解钟小飞的情况。梁冰向电影讲述了在疫情肆虐的冬天，八段关于爱与希望的平凡故事交错发生，人们彼此关爱互相拯救，共同守望春天的到来。“天下会”是武林第一大帮会，帮主雄霸武功盖世，心狠手辣。为独步天下，永存霸业，他铲除异己，广收门徒，其杀戮的两位武林高手的亲生儿子步惊云和聂风被其招为入室弟子，并授以排云掌和神风腿。10年后，步惊云与聂风威震天下、统领江湖。雄霸借女儿孔慈婚嫁之事离间风云。反目为仇的风、云兄弟俩在了解自己不幸身世后，毅然联手，为父报仇，与号称“天下第一”的雄霸展开了一场殊死决斗。The definition of a policy pattern is to define a series of algorithms, encapsulate them one by one, and make them replaceable with each other.