public synchronized ComboBox<V> removeItem(V item){
  int index=items.indexOf(item);
  if (index == -1) {
    return this;
  }
  return remoteItem(index);
}

public synchronized ComboBox < V > removeItem ( V item ) { int index = items . indexOf ( item ) ; if ( index == - 1 ) { return this ; } return remoteItem ( index ) ; }
removes a particular item from the combo box , if it is present , otherwise does nothing
