UML Class Diagram Generalization Example
UML Diagrams

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The Generalization association ("is a") is the relationship between the base class that is named as “superclass” or “parent” and the specific class that is named as “subclass” or “child”.

The UML diagram's Generalization association is also known as Inheritance. The subclass is a particular case of the superclass and inherits all attributes and operations of superclass, but can have your own additional attributes and operations.

In UML is used also the multiple inheritance when the subclass inherits properties and behaviors of more than one superclass.

On the UML Diagram the Generalization association represents as the line with empty triangle that connects superclass and subclass.

Near the Generalization association line can be write in { } any additional properties of this association that display as the constraints.

You can use the following UML keywords as constraints:

  • complete – signify that in this generalization association are specified all subclasses and the superclass cannot have another subclasses.
  • disjoint – signify that subclasses cannot contain the objects that are the instances of two or more classes at the same time.
  • incomplete – signify that on the diagram are not specified all the subclasses
  • overlapping – signify that some instances of subclasses can belong to two or more classes at the same time.

Example 1. UML Class Diagram Generalization Example

This sample was created in ConceptDraw PRO diagramming and vector drawing software using the UML Class Diagram library of the Rapid UML Solution from the Software Development area of ConceptDraw Solution Park.

This sample describes the use of the classes, the generalization associations between them, the multiplicity of associations and constraints.

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Compatibility: Apple® OS X 10.10 or later
Microsoft® Windows® 7/8.1/10

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