UML

Class diagrams

relationships between components
uml symbols uml notation
association / aggregation / composition association / aggregation / composition. Aggregation and Composition are subsets of association meaning they are specific cases of association. Association is a relationship where all objects have their own lifecycle and there is no owner.
Differences between Association, Aggregation and Composition Aggregation is a specialised form of Association where all objects have their own lifecycle_, but there is ownership and child objects can not belong to another parent object. Composition is again specialised form of Aggregation and we can call this as a “death” relationship. It is a strong type of Aggregation. Child object does not have its lifecycle and if parent object is deleted, all child objects will also be deleted.
« home