Many people consider class diagrams a bit more complicated to build compared with ER diagrams. Most of the time it’s because of the inability to understand the different relationships in class diagrams. This article explains how to correctly determine and implement the different class diagram relationships that are applicable in object-oriented modeling. What’s more, you can easily create class diagrams online using our diagramming tool.

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Realization


denotes the implementation of the functionality defined in one class by another class. To show the relationship in UML, a broken line with an unfilled solid arrowhead is drawn from the class that defines the functionality of the class that implements the function. In the example, the printing preferences that are set using the printer setup interface are being implemented by the printer.

Drawing class diagrams using medtox.org

We’ve given a lot of thought to relationships when we built our class diagramming tools. Our connectors adjust to the context and show only the most logical relationships when connecting classes. This significantly reduced your chances of making a mistake.

Drawing from scratch can be cumbersome. You can get started immediately using our professionally designed class diagrams. Browse our class diagram examples and pick the one that’s closely related to your system.

Any more questions about class diagram relationships?

I hope I’ve clearly explained the various relationships between class diagrams. They are not as complex as you think and can be mastered with some practice. And by using our tool you shouldn’t have any trouble coming up with class diagrams. If you have any more questions don’t hesitate to ask in the comments section. Also, check out this guide to UML Diagram Types with Examples for further reading.

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References:

1. UML basics: The class diagram An introduction to structure diagrams in UML 2 by Donald Bell

2. Class diagram as published on the Wikipedia website

3. The UML Class Diagram Part 1 as published on the website developer.com

4. The Class Diagram from Visual Case Tool – UML Tutorial as published on Visual Case website

5. Associations as published on the Sybase website


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aggregation association class diagram relationships class diagrams inheritance realization UML