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« Email JTextField in Swing: Ready made code

Demystifying JFormattedTextField: A Step by Step tutorial »

Ready made Simple Custom TextField components

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