Showing operation and message signatures in UML sequence diagrams

In Unified Modeling Language (UML) sequence diagrams, you can show operation signatures or message signatures of individual messages to visually represent communication in interactions in Java™ or Enterprise JavaBeans™ (EJB) applications.

You must have a sequence diagram that contains messages open.
To show an operation signature or message signature in a UML sequence diagram, in the diagram editor, right-click a message; then click Filters > Show Signature.
The operation signature or message signature of the message is displayed in the name compartment.
Note: If the message has no arguments, the operation signature of the message is displayed. If the global preference Show Operation signatures instead of Message signatures is selected, the operation signature of the message is always displayed.
Related concepts
Messages
Related tasks
Customizing the default settings for messages in UML sequence diagrams
Creating UML sequence diagrams
Creating UML sequence diagrams of Java elements
Populating UML sequence diagrams with Java elements
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