What is the difference between Composition and Association relationship?

Question

In OOP, what is the difference between composition (denoted by filled diamond in UML) and association (denoted by empty diamond in UML) relationship between classes. I\'m a

Answer 1

Composition means a part of the entity state is encapsulated by another type but it is conceptualy part of the entity state. For example you may have a address type and a employee entity type that includes a address.

Association means that a entity type is assocciated with another entity type but the assocciated entity is conceptualy not part of the entity state. For example a employee may be assocciated with a company.