Aggregation in Class Diagram

Every UML diagram belongs to one these two diagram categories. Shared aggregation is depicted as association decorated with a hollow diamond at the aggregate end of the association line.

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Here a Professor has a class to teach.

. The component classs name is not bold and you write it in the form rolenameClass. In this case you put the component inside the whole. A Teacher may belong to multiple departments.

A part classifier can belong to more than one aggregate classifier and it can exist independently of the aggregate. Aggregation represents HAS-A relationship. Consider a situation Employee object contains many.

The difference lies in the lifetime of the parts of an object. What is aggregation class diagram. To show aggregation in a diagram draw a line from the parent class to the child class with a diamond shape near the parent class.

The drawing tool Visual Paradigm Online VP Online supports Class Diagram UML ERD and Organization Chart. In UML 2 there are two basic categories of diagrams. In software engineering a class diagram in the Unified Modeling Language UML is a type of static structure diagram that describes the structure of a system.

Data flows from the whole classifier or aggregate to the part. Composition The composition relationship. If a class have an entity reference it is known as Aggregation.

Aggregation is a variant of the has a association relationship. ProfFazal Rehman Shamil Available for Professional Discussions 1. Class diagram showing Aggregation between two classes.

Class Diagram Aggregation Example. If the parts can live independently from the parent then you have an aggregation. Message on Facebook page for discussions.

If the partss lifetime are. What is Class Diagram. An aggregation is a special type of association in which objects are.

Structure diagrams and behavior diagrams. Figure 6-7 shows another notation for composition. In UML models an aggregation relationship shows a classifier as a part of or subordinate to another classifier.

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