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Builder mode refers to separating the internal representation of a product from the construction process of the product, thus enabling a construction process to generate product objects with specific different internal representations. It emphasizes the construction process of the product. The main points of its implementation include:英雄警察陈家驹（成龙 饰）又回来了。不过，性格火爆、直言不讳的他这次因为不满意上司放走了一个极其危险的重犯而和上司吵翻了，愤然辞职。脱离了警察生活的家驹和女友去旅行期间，一间电话公司遭到了炸弹恐吓，本性难移的家驹马上赶到了现场，着手调查案件。It's good to like it yourself. This is the key. Only when you feel better can you make progress. However, I have written information here and hope I can help you.……高凡走出棚子，抬头一看，只见山壁半腰处悬着一样物事：下面吊着一个圆圆的东西，里面火星乱迸，上面张开半圆好像伞，正悠悠荡荡地朝上飘去。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.