Validate text in form

I have a form that the user input has to fill. I would like this behaviour: the user input insert the text in a field (it can be a textfield) and when it loose the focus start to valide the text just inserted (it's control just if is only a string, only a number, only a date and so on).
I can do this using jtextfield and implementing a focusListener and writing a method for the validation by myself.
I'm wondering wich is the best practice have this very common behaviour. I looked also JFormattedText but I'm not sure they are made for this job. And what about the validation method? I should check char by char or there is a better way?

See javax.swing.InputVerifier

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