Hands-On Design Patterns with Java

Use case diagrams

Use case diagrams document the interactions between your users and your system. This is typically done with text, but UML does support use cases.

Let's start by looking at use cases in text, and then review a UML diagram representing the same use cases. We will use an example of a grade book for an online education institution.

The student logs on to the system and selects their class. The student then selects the assignment and uploads their document. Next, the student enters text and selects the submit button.

The instructor logs on to the system and selects their class. The instructor then selects the assignment, and the student. They grade the assignment, enter a grade, and select the submit button.

These use cases ...