- Elements of a state-transition diagram
A state-transition diagram presents a sequence of states that an object goes through during its lifecycle. It describes how the states of an object or component change.
A state is defined by its duration and stability.
A transition represents the change from one state to another.
A transition is triggered:
- by an event.
- automatically when no triggering event is specified.
For example, the diagram below presents the different steps for a car wash:
Elements of a state-transition diagram
A state-transition diagram includes the following elements:
- state: represents the value of the object attributes at a given time.
- initial state: represents the state when the system is started.
- final state: represents the state of the system at the end of the operation.
- superstate: used to structure the diagram by specifying several distinction levels between the states.
- history: represents the last active state of a superstate (or composite state).
- entry/exit points: represent the states in a superstate. This allows you to link these states to other states that do not belong to the superstate.
- transition: represents the change from one state to another.
- package: divides and organizes the diagram representation (in the same way that directories organize files).
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