JFormattedTextField is a very useful Swing component, that let’s your users see data in a format suitable for them, while letting you read or write from it in a way that that suitable for your code. Let’s make sure that you clearly understand everything related to it.
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Demystifying JFormattedTextField: A Step by Step tutorial

   Here’s 3 kinds of text fields that you may want to use in your java swing projects.

• An “Email” text-field: That doesn’t let the focus out without the user entering a valid email address
• An “Numeric” text-field: That accepts only numeric input and ignores all others
• An “upper case” text-field: That automatically converts the characters to upper case as the user types in

   Besides using this components in whatever way you like, looking at the code can give you an excellent insight on using InputVerifier and DocumentFilter if you have already not used them