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  Tutorial: Unified Modeling Language - Class & Object Diagrams

Unified Modeling Language - Class & Object Diagrams

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This resource page is designed to provide an overview of the Unified Modeling Language (UML) notation used in the AITP NCC Java Competition Event. All of the Java event problem statements are documented using TogetherSoft TogetherJ, Rational Rose, and the UML version 1.3/2.0 notation. The Object Management Group (OMG) is currently working to finalize UML version 2.0. This tutorial is going to focus on UML notation basics, which will conform to all versions of UML (from 1.3 through 2.0).

UML Class Diagram Notation

A Class Diagram provides an overview of a system by showing its classes and the relationships among them. Class diagrams are static - they display what interacts, but not what happens when they do interact.

The Class is represented as a rectangle that is typically divided into three regions. The top region contains the class name, the middle region contains the class attributes, and the bottom region contains the class methods (or operations). NOTE: TogetherJ adds a fourth region to the bottom that shows the class properties, which are attributes with assessor (getter) and mutator (setter) methods.


 

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