private boolean removeGroupsInt(String[] oldGroups){
  boolean removed=false;
  for (int i=0; i < oldGroups.length; i++) {
    removed|=groups.remove(oldGroups[i]);
  }
  return removed;
}

private boolean removeGroupsInt ( String [ ] oldGroups ) { boolean removed = false ; for ( int i = 0 ; i < oldGroups . length ; i ++ ) { removed |= groups . remove ( oldGroups [ i ] ) ; } return removed ; }
remove the specified groups from the set of groups to discover , and return true if any were actually removed .
