Knowing when the input on aJFormattedTextField is done

I'd like to know when the user finished entering the data to a FormattedTextField. by finished I mean that the user has entered all the letters that he could, according to the format (i.e. on zip code format ##### after 5 digits the user is done).
i'd like to move the focus automaticly to the next field.

basicly you can add a KeyListener to it. in its keyTyped, keyPressed, or keyReleased method you can check if the length is reached and then you can change the focus manually to the next component.
but this "solution" means that you have to implement many key-listeners (one for each textfield).
regards Errraddicator

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