UML association vs. composition and detail level

Question

Actually, make that a couple of amateur UML questions! When creating a UML diagram to model some domain concepts and you come across a domain concept that \"holds\" some inf

Answer 1

Association :
It means two classes have some kind of relationship, could be anything really.
E.g : A uses B, A is related to B in a given way.

Composition :
This is also a special type of association used for modelling 'Ownership'. This is very similar to Aggregation with the only difference that it depicts a Whole-part relationship and the 'part' entity doesn't have its own independent existence

E.g : A consists of B; B is a part of A and hence cannot exist without A.

Good explanation : UML Class Diagram: Association, Aggregation and Composition