public void makeImmutable(){
  if (isMutable) {
    if (idpList != null) {
      idpList.makeImmutable();
    }
    if (requesterIDList != null) {
      for (      RequesterID reqID : requesterIDList) {
        reqID.makeImmutable();
      }
    }
    isMutable=false;
  }
}

public void makeImmutable ( ) { if ( isMutable ) { if ( idpList != null ) { idpList . makeImmutable ( ) ; } if ( requesterIDList != null ) { for ( RequesterID reqID : requesterIDList ) { reqID . makeImmutable ( ) ; } } isMutable = false ; } }
makes this object immutable .
