Aggregation and Composition in java

Samuel Fernandes

Total Post:159

Points:1117

Re: Aggregation and Composition in java

Posted on March-17-2015 1:48 AM

Composition means that the object doesn't make sense without the composed part.

Aggregation means the aggregated part can exist independently from the object.

Example: a car doesn't make much sense without an axle and vice versa. So a car is composed of an axle. But the CD player in the car can exists independently from the car (in some cases). So the car and the CD player are aggregated.

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Mayank Tripathi

Total Post:397

Points:3117

Re: Aggregation and Composition in java

Posted on March-17-2015 1:55 AM

For car example:

Composition: Car and wheel.

Aggregation: Car and passenger.

This diagram will make the difference more clear among the relationships:

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