About UML statechart diagrams

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A state machine, which is attached to a class or use case, is a graph of states and transitions that describes the response of an object to outside stimuli.

A statechart diagram represents a state machine. By documenting events and transitions, a statechart diagram shows the sequence of states an object goes through during its life.

To represent a flow driven by internally generated actions rather than external events, use an activity diagram.

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