question: public static String timeToString ( String time ) { String theTime = null ; if ( Pattern . matches ( "[012][0-9]:[0-5][0-9]" , time ) ) { int hour = Integer . parseInt ( time . substring ( 0 , 2 ) ) ; int min = Integer . parseInt ( time . substring ( 3 ) ) ; theTime = timeToString ( hour , min ) ; } return theTime ; }
target:  Returns a string that corresponds to the given time.