The simplest is dependency

flying_snow (飞雪浮冰)
Dependency is where one object must know about another.
In a simple dependency relationship all we know is that one object has knowledge of another. For example, in C++, if one class requires the inclusions of the header for another, that establishes a dependency.
2001-3-29 -05:00

回到话题: OO. I know the relationship between Composition and Inheritance. But I can't understand clearly about Aggregation, Association, and Dependency. Would you please help me clarify them? tks.

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