State diagram
A state is a
condition during the life of an object, or an interaction, during
which, it satisfies some condition, performs some action, or waits for some
event. An object remains in a state for a finite (non-instantaneous) time. Actions
are atomic and non-interruptible. A state may correspond to
ongoing activity. Such activity is expressed as a nested state machine
Objects
have behaviors and state. The state of an object depends on its current
activity, or condition. A state chart diagram shows the possible states
of the object and the transitions that cause a change in state.
A
statechart diagram represents a state machine. The states are represented by
state symbols, and the transitions are represented by arrows connecting the
state
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