question: public int findCarByRoadNumber ( String roadNumber ) { if ( sysList != null ) { if ( ! roadNumber . equals ( _roadNumber ) ) { return getIndex ( 0 , roadNumber ) ; } int index = getIndex ( _index , roadNumber ) ; if ( index > 0 ) { return index ; } return getIndex ( 0 , roadNumber ) ; } return - 1 ; }
target:  Search for car by road number