Prerequisite – Association, Composition and Aggregation in Java
An association is defined as an organization of people with a common purpose and having a formal structure. It represents a binary relationship between two objects that describes an activity. It is a relationship between objects. For example, A doctor can be associated with multiple patients.
An aggregation is a collection, or the gathering of things together. This relationship is represented by a “has a” relationship. In other words, aggregation is a group, body, or mass composed of many distinct parts or individuals For example, phone number list is an example of aggregation.
Difference between Aggregation and Association:
|Aggregation describes a special type of an association which specifies a whole and part relationship.||Association is a relationship between two classes where one class use another.|
|It in flexibile in nature||It is inflexible in nature|
|Special kind of association where there is whole-part relation between two objects||It means there is almost always a link between objects|
|It is represented by a “has a”+ “whole-part” relationship||It is represented by a “has a” relationship|
|Diamond shape structure is used next to the assembly class.||Line segment is used between the components or the class|
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