in Unified Modeling Language (UML) sequence diagrams, you can create
lifelines and specify class names and types for lifelines to develop interactions
for Java™ or
Enterprise JavaBeans™ (EJB) applications.
Creating lifelines
In Unified Modeling Language (UML) sequence diagrams, you can create
lifelines to show how instances participate in interactions between Java elements.
Deleting lifelines
You can delete lifelines from Unified Modeling Language (UML) sequence diagrams.
Terminating lifelines with stop nodes
In Unified Modeling Language (UML) sequence diagrams, when you create a destroy message, a stop node is created automatically on the lifeline. However, you can manually create a stop node on a lifeline to terminate the lifeline at a specific position.
Repositioning lifelines
In Unified Modeling Language (UML) sequence diagrams, you can move a lifeline to reposition the instance’s activity in an interaction frame. Although the horizontal order of a lifeline does not have semantic value in the project, you can move the lifeline horizontally to position it in a location that makes the diagram easier to read.