public void clearReceipt(String receipt_id){
synchronized (_receipts) {
    for (Iterator i=_receipts.iterator(); i.hasNext(); ) {
      String o=(String)i.next();
      if (o.equals(receipt_id))       i.remove();
    }
  }
}

public void clearReceipt ( String receipt_id ) { synchronized ( _receipts ) { for ( Iterator i = _receipts . iterator ( ) ; i . hasNext ( ) ; ) { String o = ( String ) i . next ( ) ; if ( o . equals ( receipt_id ) ) i . remove ( ) ; } } }
deletes all receipts with a given id
