In UML diagrams, such as sequence
and communication diagrams, you can create lifelines to represent
objects in a system.
Before you begin
You must have a sequence or communication diagram open.
Procedure
- In the Palette, click Lifeline.
- In the editor, click in an interaction frame
where you want to add the new lifeline.
- In the dialog box, click a type of lifeline:
| Lifeline |
Details |
|---|
| Unspecified |
This option creates a lifeline without a specified type. |
| Create Class |
This option creates a lifeline that represents a class. You
type a name for the new lifeline and then for the object. |
| Create Actor |
This option creates a lifeline that represents an actor. You
type a name for the new lifeline and then for the object. |
| Create Component |
This option creates a lifeline that represents a component.
You type a name for the new lifeline and then for the object. |
| Select Existing Element |
This option enables you to select an existing element in the
model. |
Results
When you create a lifeline in a sequence diagram,
the lifeline is aligned vertically with other lifelines in the interaction,
and extends downward. You can resize a lifeline by clicking it and
dragging the anchors vertically or horizontally.
Tip: You
can also assign an existing element type to a lifeline: In the navigation
view, click a class, interface, or data type and drag it onto a lifeline
in the interaction frame.