Changes between Version 2 and Version 3 of Standards/CompositionVersusAggregation

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Author:
demian (IP: 81.1.72.113)
Timestamp:
05/28/08 04:41:02 (5 years ago)
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  • Standards/CompositionVersusAggregation

    v1 v3  
    22 
    33When trying to understand the relationships between objects, the discussion of aggregretation versus composition always comes up.  For completeness, a third relationship should be mentioned, association.  By far the best discussion of this topic can be found [http://www.patternscentral.com/modules.php?name=Sections&op=viewarticle&artid=8&page=2 here].  The conclusion reached by the author is as follows: 
    4   
    5 COMPOSITION: If destroying the whole destroys (or renders meaningless) the parts, then we have a composition. 
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    7 AGGREGATION: If destroying the components destroys (or renders meaningless) the whole, then we have an aggregation. 
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     6'''COMPOSITION''': If destroying the whole destroys (or renders meaningless) the parts, then we have a composition. 
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     8'''AGGREGATION''': If destroying the components destroys (or renders meaningless) the whole, then we have an aggregation. 
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    910Composition EXAMPLE: