public List<String> getKnownCities()
    {
        List<String> cities = new ArrayList<String>(DISTANCES.keySet());
        Collections.sort(cities);
        return cities;
    }
public List < String > getKnownCities ( ) { List < String > cities = new ArrayList < String > ( DISTANCES . keySet ( ) ) ; Collections . sort ( cities ) ; return cities ; }
{@inheritDoc}