public Animal() {

	feed_send_buffer = new byte[2];
	mode_send_buffer = new byte[1];
	contagious_send_buffer = new byte[1];
	symptoms_send_buffer = new byte[1];
  }




 
  public void process(APDU apdu) throws ISOException
  {
	byte[] buffer = apdu.getBuffer();


	// process is called on applet selection,
	// but we don't do anything in this applet
	if ((buffer[ISO.OFFSET_CLA] == SELECT_CLA) &&
	(buffer[ISO.OFFSET_INS] == SELECT_INS)) return;


	if (buffer[ISO.OFFSET_CLA] == ANIMAL_CLA) {
	  short size = (short) buffer[ISO.OFFSET_LC];
	  byte[] temp;
	  switch (buffer[ISO.OFFSET_INS]) {
	  case ANIMAL_WHO_ARE_YOU:
	apdu.setIncomingAndReceive();
	sendResponse(apdu, getWhoAreYou());
	break;


	  case ANIMAL_MESSAGE:
	apdu.setIncomingAndReceive();
	System.beginTransaction();


				mode = MODE_SAD;
			System.commitTransaction();
	sendResponse(apdu, getMessage());
	break;


	  case ANIMAL_WHERE_YOU_ARE:
	temp = receive(apdu);
	byte[] loc = new byte[size-LOCATION_OFFSET];
	Util.arrayCopy(temp, LOCATION_OFFSET, loc,
			   (short)0, (short)loc.length);
	setWhereYouAre(temp[INDOOR_TEMPERATURE_OFFSET],
			   temp[OUTDOOR_TEMPERATURE_OFFSET],
			   temp[LIGHT_OFFSET], loc);
	break;


	  case ANIMAL_LAST_LOCATION:
	apdu.setIncomingAndReceive();
	if (getLastLocation() != null) sendResponse(apdu, getLastLocation());
	break;


	  case ANIMAL_FEED:
	sendResponse(apdu, feed(receive(apdu), size));
	break;


	  case ANIMAL_MODE:
	apdu.setIncomingAndReceive();
	mode_send_buffer[0] = getMode();
	sendResponse(apdu, mode_send_buffer);
	break;


	  case ANIMAL_OPERATIONS:
	apdu.setIncomingAndReceive();
	sendResponse(apdu, getOperations());
	break;


	/**  case INSECT_MOVE:
	sendResponse(apdu, moveInsect(receive(apdu)));
	break;
*/
	  default:
	processGeneric(apdu);   // Let the generic animal handle it
	  }
	} else if (buffer[ISO.OFFSET_CLA] == ANIMAL_OP) {
	  // It is an instruction for an Animal-specific operation...
	  performOperation(buffer[ISO.OFFSET_INS]);
	} else  {
	  // Don't know what to do with this instruction...
	  throw new ISOException(ISO.SW_CLA_NOT_SUPPORTED);
	}
  }


.....