UML State Machine Diagrams

A reactive object's behavior changes in response to events.

Objects that respond differently to events depending on their current state.

An event or a guard condition can trigger a transition from one state to another.

States can be nested within other states, creating a hierarchy of states.

A standard notation for visually representing state machine diagrams.

To graphically illustrate an object's states and how events trigger transitions between them.

Arrows with labels indicate transitions between states.

A state-dependent object reacts differently to events based on its current state. A state-independent object reacts the same regardless of its state.

Events not represented in the state diagram are ignored by the object.

A snapshot of an object's condition at a specific point in time.