How to validate in java swing.

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Java

Swing

validation

I am developing a Java Swing Application.

The application ends with a form to take the customer's input information (name, last name, email, gender, etc)

I am trying to validate the text fields in a way that when the application is launched focus will go on the first text box (first name). I want the user to not be able to leave the box until they have entered a valid name (no numbers, punctuation and so on).

Unfortunately even after looking online, I am not able to find a solution to validating these boxes.

Action Plan:

Focus on first textfield >>> Unable to leave unless valid input is entered >> messages outputted to user >> validation completed >> focus set on next field >> and so on.

Help would be appreciated.

What I have tried:

i have tried focus lost listener to deal with it but could't succeed.