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State diagram

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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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