Java - hledání duplicit v poli

public static boolean methods(CB_color array[]) {
  java.util.List<Integer> array = java.util.Arrays.asList(array[0].getSelectedIndex(), array[1].getSelectedIndex(),  
    array[2].getSelectedIndex(), array[3].getSelectedIndex());
  java.util.HashSet hash = new java.util.HashSet<>(array );
  return array.size() == hash.size();
}