I don't think you can guarantee it, but it's likely to be the order in
which they're added to the list via the addPropertyChangeListener() call.

= Steve =

Although it is possible, I'd recommend to not do so.

Typically an observable hides the implementation
of the update notification. However, you can write
your own update mechanism that guarantees the order.

You decouple to reduce the complexity between
the observed and the observing objects. If a special
sequence of update notifications is necessary,
you are loosing this advantage of the pattern and
may consider using an explicit update instead.

Using the standard property change pattern with
a specialized update implementation may confuse
users of the API.

Hope this helps,
--
Karsten Lentzsch
www.JGoodies.com - Java User Interface Design