Composition and Aggregation in UML

Posted Date: 11 Feb 2009	Resource Type: Articles	Category: .NET Framework
Author: Shankar	Member Level: Diamond
Rating:	Points: 20

Aggregation
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The Parent and the child objects in aggregation ‘has a’ relationship. The data flow from the parent to the child. But the child can exist without the parent.
This is represented with a unfilled Diamond pointing towards the parent.
The child will have an arrow that mention that the child does not know about the parent.

Example
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A Person must have address. But the address object may be related to other objects also.

Composition
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The Parent contains the child object. The parent is made up of certain objects. The child cannot exist without the parent. The child will be associated to only one parent. This relation ship is Child is a ‘part of’ parent.
This is represented with a filled Diamond pointing towards the parent.

Example
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Like a Circle contains Points. Points do not know about the Circle. So if a circle is destroyed then points also.

A Car and its Engine. The Engine cannot exist without the Car.

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