What is aggregation in UML?

Aggregation relationship is represented by a straight line with an empty diamond at one end . The composition relationship is represented by a straight line with a black diamond at one end. In UML, it can exist between two or more classes. It is a part of the association relationship.

In UML models, an aggregation relationship shows a classifier as a part of or subordinate to another classifier. An aggregation is a special type of association in which objects are assembled or configured together to create a more complex object .

Aggregation implies a relationship where the child can exist independently of the parent . Example: Class (parent) and Student (child). Delete the Class and the Students still exist.

Aggregation relationship is represented by a straight line with an empty diamond at one end . The composition relationship is represented by a straight line with a black diamond at one end. In UML, it can exist between two or more classes. It is a part of the association relationship.