Hey guys in this article, you will understand the difference between Aggregation and Composition with easy to understand examples
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Aggregation vs Composition
Following are the difference between Aggregation and Composition
| Aggregation | Composition |
| Aggregation is a weak Association. | Composition is a strong Association. |
| Class can exist independently without owner. | Class can not meaningfully exist without owner. |
| Have their own Life Time. | Life Time depends on the Owner. |
| A uses B. | A owns B. |
| Child is not owned by 1 owner. | Child can have only 1 owner. |
| Has-A relationship. A has B. | Part-Of relationship. B is part of A. |
| Denoted by a empty diamond in UML. | Denoted by a filled diamond in UML. |
| We do not use “final” keyword for Aggregation. | “final” keyword is used to represent Composition. |
| Examples: – Car has a Driver. – A Human uses Clothes. – A Company is an aggregation of People. – A Text Editor uses a File. – Mobile has a SIM Card. |
Examples: – Engine is a part of Car. – A Human owns the Heart. – A Company is a composition of Accounts. – A Text Editor owns a Buffer. – IMEI Number is a part of a Mobile. |
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