What is UML class diagram?

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 by showing the system’s classes, their attributes, operations (or methods), and the relationships among objects.

What is a class?

A Class is a blueprint for an object. Objects and classes go hand in hand. We can’t talk about one without talking about the other. And the entire point of Object-Oriented Design is not about objects, it’s about classes, because we use classes to create objects. So a class describes what an object will be, but it isn’t the object itself.

In fact, classes describe the type of objects, while objects are usable instances of classes. Each Object was built from the same set of blueprints and therefore contains the same components (properties and methods). The standard meaning is that an object is an instance of a class and object – Objects have states and behaviors.

Free UML class diagram books

Listed below is a rich collection of free UML eBooks related to UML class diagrams. If you want to learn more about class diagrams or UML, we recommend you to have a look.

More UML books and UML tools

Want to learn more about UML? We have a rich collection of UML books, UML lectures and UML presentations. Check for more details.

If you want to draw UML diagrams, we recommend you try out the UML tools below:

• Visual Paradigm (Desktop) – Award-winning UML modeling software
• Visual Paradigm Online – Easy-to-use UML diagram tool

Enjoy! 🙂