public interface OperationTimer
start()should be called at the start of the operation, and
reset()should be called at the end of the operation. If the stopwatch needs to be paused in the middle of the operation, a call to
start()can be made, with a subsequent call to
start()to resume the stopwatch.
IllegalStateException- if the timer is already running.
IllegalStateException- if the timer is already stopped.
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