ITPEC FE Morning October 2020 Question 45
ITPEC FE Morning October 2020 — Question 45 of 80
UML Sequence Diagram — shows message exchange among objects along a time axis.
A Sequence diagram displays:
- Object lifelines — vertical dashed lines representing object existence over time
- Messages — horizontal arrows between lifelines showing interactions
- Time axis — flows top to bottom, showing chronological order
Why not others:
- (a) Activity diagram — models workflows and control flow, not object messaging
- (b) Communication diagram — shows object messaging but uses numbering instead of a time axis
- (d) State-machine diagram — models states and transitions of a single object
Key distinction: Both Sequence and Communication diagrams show object messaging, but only Sequence uses a time series (vertical axis).
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