public void addColumns(Collection<Column> columns){
  for (Iterator<Column> it=columns.iterator(); it.hasNext(); ) {
    addColumn((Column)it.next());
  }
}

public void addColumns ( Collection < Column > columns ) { for ( Iterator < Column > it = columns . iterator ( ) ; it . hasNext ( ) ; ) { addColumn ( ( Column ) it . next ( ) ) ; } }
adds the given columns .
