Don’t get me wrong. Using Constants are good. But I am just facing a situation where I feel terribly bad on why I did.
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Never thought Even constants(public static final) could be Bad

   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

   Here’s a ready made Email text field written as a swing component. This text field allows the user to type any thing in it but does not allow the focus to go out of it unless whatever the user has typed is a valid email address. Note that extensive validation is not done. You can modify the code as you like. There are no restrictions. The code uses an input verifier to achieve this.
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Email JTextField in Swing: Ready made code

Here’s a ready made Numeric(Numbers only) text field written as a swing component. This text field allows only numeric data to be entered in it. When the user enters anything that non numeric in the text field, the system will beep. It’s implemented using a DocumentFilter that filters out all non-numeric characters from being entered in the Swing textfield’s document
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Numeric (Number only) JTextField in Swing: Ready made code