About UML statechart diagrams

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.

Statechart diagram showing the transitions an object undergoes as it responds to outside events

Callout 1 The initial state is the state of an object before any events in the diagram have acted upon it.

Callout 2 A state represents an instant in the life of an object. Double-click a State shape to add a name and list its internal actions and activities.

Callout 3 TransitionsTransitions indicate that, in response to an event, an object will go from one state to another and perform an action.

Callout 4 The event which triggers the transition is named in the transition string. Double-click a transition to label it with a string that, in addition to an event signature, can also include a guard condition, an action expression, and more.

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