question: start to measure times and make the state of stopwatch running . concode_field_sep boolean isStarted concode_elem_sep long currentElapsedNanos concode_elem_sep long startNanos concode_field_sep StopWatch stop concode_elem_sep boolean isRunning concode_elem_sep long now concode_elem_sep long now concode_elem_sep StopWatch reset concode_elem_sep String toString concode_elem_sep void close
target: StopWatch function ( ) { if ( isStarted ) { throw new IllegalStateException ( "srini_string" ) ; } isStarted = true ; startNanos = System . nanoTime ( ) ; return this ; }