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Another thing. Do you really want to create a separate ActionListener for every button, you may be better creating one ActionListener for all the buttons that type a character and add that to all...

BTW hard coding the bounds of the buttons is the wrong way to go, it means your keyboard can't be resized. Use a layout manager to layout the buttons instead. You'll probably need something like...

Please use Java naming conventions.

Why are you using a JFormattedTextField and not just a JTextField?

Your problem is because setText() overwrites what is currently in the text field so you...