ITPEC FE Subject A April 2024 Question 34
ITPEC FE Subject A April 2024 — Question 34 of 60
UML State Diagram components — identify elements of a UML 2.x state diagram.
A state diagram (also called state machine diagram) models the lifecycle of an object through its states and transitions.
- •State — a condition or situation of an object (e.g.,
Idle,Processing,Completed) - •Transition — a directed arrow showing movement from one state to another, triggered by an event
Why not others:
- (a) Message and Activity — Message belongs to sequence diagrams; Activity belongs to activity diagrams
- (b) Message and Transition — Message is not a state diagram element
- (c) State and Message — Message is not a state diagram element
Key rule: State diagram = States + Transitions. Messages → Sequence diagram. Activities → Activity diagram.
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