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韩信这会子很是客气道：事情紧急，闻听先生贤明，韩信求贤若渴的，想要尽快见到先生。白果着急地说道：小姐，我看哪，咱们还是去岷州吧。Decorator mode is also called Wrapper mode, which can dynamically add some additional functions to an object. Decorator mode is more flexible than the way of inheriting and generating subclasses. Although decorator mode can dynamically attach responsibilities to objects, it will also cause some small objects to be generated, increasing the complexity of the system. The specific structure diagram is shown below.Drug name: Sennae folium, Sennae fructusCad shortcut-baidu encyclopedia送过茶后，庞夫人和翘儿又去厨房忙活。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.