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JTextField has a keyTyped event but it seems that at the time it fires the contents of the cell have not yet changed.
Because of that .length() is always wrong if read here.
There must be a simple way of getting the length as it appears to the user after a key stroke?
This is probably not the optimal way (and it’s been a while), but in the past, I have added a DocumentListener to the JTextField and on any of the events (insert, update, remove) I:
Which returns the total length of text field’s contents.