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As far as a class is concerned, there should be only one reason for it to change. If a class assumes too many responsibilities, it is tantamount to coupling these responsibilities together. Changes in one responsibility may affect other responsibilities. In addition, coupling multiple responsibilities together will also affect reusability.你当我没看出来？我呆在你身边，只怕还要安全些。　　[雷公桥]临安城北有一运河，只有一雷公渡口连接两岸，派特·贝克（托尼·德普 Tony Doupe 饰）是小镇的一位警长。然而他的儿子科特·贝克（亚伦·布莱克利 Aaron Blakely 饰）却有着极其黑暗的过去。十三年前，他因残酷地杀害了自己的亲生母亲而被关进了精神病院。1) The management confusion of the development environment is a headache for developers, especially when some teams share the development environment and there are many projects, it will be even more chaotic.高易深以为然地点点头，说道：再者就是外部情况，北边的西楚和九，江，南边的东瓯和闽越……北边先不用担心，现在封锁消息，项羽和英布不可能很快得到消息。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.