public Iterator<String> keys ()
    {
        HashSet<String> matches = new HashSet<String>();
        enumerateKeys(matches);
        return matches.iterator();
    }
public Iterator < String > keys ( ) { HashSet < String > matches = new HashSet < String > ( ) ; enumerateKeys ( matches ) ; return matches . iterator ( ) ; }
Returns an iterator that returns all of the configuration keys in this config object.