Подскажите пожалуйста что не так???

map.put("Stallone", df.parse("JUNE 1 1980"));
.
.
.

public class Solution {
    public static HashMap<String, Date> createMap() throws ParseException {
      //  DateFormat df = new SimpleDateFormat("MMMMM d yyyy", Locale.ENGLISH);
        DateFormat df  = new SimpleDateFormat("MMMM", Locale.ENGLISH);
        HashMap<String, Date> map = new HashMap<String, Date>();

        map.put("Stallone", df.parse("JUNE 1 1980"));
        map.put("Stallone1", df.parse("JULY 1 1980"));
        map.put("Stallone2", df.parse("SEPTEMBER 1 1980"));
        map.put("Stallone3", df.parse("AUGUST 1 1980"));
        map.put("Stallone4", df.parse("JANUARY 1 1980"));
        map.put("Stallone5", df.parse("APRIL 1 1980"));
        map.put("Stallone6", df.parse("OCTOBER 1 1980"));
        map.put("Stallone7", df.parse("JUNE 1 1980"));
        map.put("Stallone8", df.parse("NOVEMBER 1 1980"));
        map.put("Stallone9", df.parse("FEBRUARY 1 1980"));
        return map;

        //напишите тут ваш код
    }

    public static void removeAllSummerPeople(HashMap<String, Date> map) {
         Iterator<Map.Entry<String, Date>> iterator=map.entrySet().iterator();
         DateFormat df  = new SimpleDateFormat("MMMM", Locale.ENGLISH);

        while (iterator.hasNext()){
          Map.Entry<String, Date> pair=iterator.next();
          Date date=pair.getValue();
          String f = df.format(date);

          if (f.equals("June"){
          iterator.remove();
           }
           else if (f.equals("July"){
          iterator.remove();
           }
           else if (f.equals("August"){
          iterator.remove();
           }


        }
    }

    public static void main(String[] args) throws ParseException {

removeAllSummerPeople(createMap());
    }
}

public static void removeAllSummerPeople(HashMap<String, Date> map) throws ParseException {
        Iterator<Map.Entry<String, Date>> iterator = map.entrySet().iterator();
        while(iterator.hasNext()){
            Map.Entry<String, Date> pair = iterator.next();
            String key = pair.getKey();
            Date value = pair.getValue();
            SimpleDateFormat dateFormat  = new SimpleDateFormat("MMMM", Locale.ENGLISH);
            String f = dateFormat.format(value);
            if(f.equals("June")){
                iterator.remove();
            }else if(f.equals("July")){
                iterator.remove();
            }else if(f.equals("August")){
                iterator.remove();
            }

        }

        //System.out.println(map);
        //напишите тут ваш код

    }

public static void main(String[] args) {
        try {
            HashMap<String, Date> map = createMap();
            removeAllSummerPeople(map);
        } catch (ParseException e) {
            e.printStackTrace();
        }


    }