# Object definition object(S,"s:Switch"); object(P,"p:Pump"); step(); active(S); active(P); # Message exchange message(S,P,"run()"); message(S,P,"stop()"); # Object lifeline completion step(); complete(S); complete(P);Here, we have manually advanced the timeline of our diagrams with a
step();
call after we defined the objects,
to provide them with a bit of breathing space.
We also added a similar step call at the end of the diagram.
Finally, we made both objects active, after their definition.
Calling active on a given object will change the drawing of its
lifeline, from the dashed format indicating an inactive object,
to a thick swimming-lane, active object, format.
The resultant diagram is
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