Java Tutorial 14 : Aggregation in Java | With Real Life Example -YouTube

Java Tutorial 14 : Aggregation in Java | With Real Life Example -YouTube

Aggregation in Java

If a class have an entity reference,
it is known as Aggregation.
Aggregation represents HAS-A relationship.

Consider a situation, Employee object contains many
informations such as id, name, emailId etc.
It contains one more object named address,
which contains its own informations such as city, state,
country, zipcode etc. as given below.

class Employee{
int id;
String name;
Address address;//Address is a class
...
}

In such case, Employee has an entity reference address,
so relationship is Employee HAS-A address.

Why use Aggregation?

For Code Reusability.


When use Aggregation?

Code reuse is also best achieved by aggregation when
there is no is-a relationship.
Inheritance should be used only
if the relationship is-a is maintained throughout
the lifetime of the objects involved; otherwise,
aggregation is the best choice.

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