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Lesson 9 - UML - Package Diagram and Deployment Diagram

In the previous lesson, Flowcharts, we digressed from the UML a little and introduced flowcharts that you can still encounter sometimes. In today's UML tutorial, we're going to discuss two other types of UML diagrams. These are the Package diagram and the Deployment diagram. Both diagrams have only a few symbols, so we can manage them both in today's lesson.

Package diagram

The Package diagram is a relatively simple diagram. If you remember the UML diagram types from the beginning of the course, the Package diagram belongs to the structural diagrams. As you know, the same way we group methods into classes, we group classes into packages or namespaces (depending on how these structures are called in a given programming language). Real commercial applications often have hundreds of classes. If they were all global, there would be name collisions and the project would be unclear.

The package diagram describes the structure of packages or namespaces in an application and dependencies between them (how they are nested or accessible).


As always, let's describe what symbols we use in the Package diagram:


A UML package symbol

We draw the package as a folder icon with its name. The name is sometimes written


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In this UML tutorial, we'll explain the Package diagram in detail and the Deployment diagram as well. Real-world examples are included.

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Article has been written for you by David Capka
The author is a programmer, who likes web technologies and being the lead/chief article writer at He shares his knowledge with the community and is always looking to improve. He believes that anyone can do what they set their mind to.
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