A co tohle?

public void check_diffrents(ObjectArrayList<Player> color_player, int number) {
        ObjectOpenHashSet hash = new ObjectOpenHashSet();
        try {
          setDisable(false);
          for (int i = number - 1; ; i -= 1) {
            if (!hash.add(color_player.get(i).getFill())) {
               setDisable(true);
               break;
            }
          }
        } catch (ArrayIndexOutOfBoundsException e) {
        }   
}