Tag: Aggregation in Java w3schools

In this article, we discussed Association in Java. If we want to establish connections between two classes then we can use any type of association according to the need. If the objects are independent of each other, we use Aggregation and if they are dependent then we use Composition .

Aggregation should be used only in cases where there is a compositional relationship between classes , where one class is composed of other classes, where the “parts” are incomplete outside the context of the whole.

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

Aggregation acknowledges that the two classes have their own life cycle (i.e. can exist without each other). Each object is instantiated separately. In the example of a hand of cards, the cards will already exist before they are added to a Hand class.

By aggregating all the data points, we can identify the source of traffic and see how they progress through the customer journey . In turn, that helps us understand the actual value of the marketing activity.