Difference Between Aggregation and Association

Analysis of AlgorithmsAlgorithmsMisc Algorithms

In this post, we will understand the differences between aggregation and association.


It can be understood as an organization of people that have a common purpose. It also indicates that they consist of a formal structure. It represents a binary relationship between the two objects that describe some kind of activity.

It is a relationship between multiple objects.

An example would be how consuming healthy food is related not just to a healthy weight, but to good skin, good hair, strength and being active.

  • Association is a relationship between two classes where one class uses the other class.
  • It is not flexible in nature
  • This indicates that there is also some kind of link/relation between the objects.
  • It can be represented as a 'has a' relationship.
  • The components of a class can be linked using line segments.

Let us see how it can be represented −


It tells about a special type of an association that specifies a whole and a part of a relationship. It is a collection, i.e a group of things that are stored together.

  • It can be represented as a 'has a' and 'whole-part' relationship.
  • It can be understood as a group that has distinct parts
  • Example would be a single teacher teaches a group of children.
  • It is flexible in nature.
  • It is a special kind of association that consists of whole-part relation with respect to objects.
  • It has a diamond shape that is used after the assembly class.

Let us see how it can be represented −

Updated on 02-Mar-2021 05:19:14