How do I prevent entering '.' character in JFormattedTextField

Question

How do I prevent entering '.' character in JFormattedTextField (or JTextField if that easier) ?

Answer 1

You can also write a simple listener:

addKeyListener(new KeyAdapter() { public void keyTyped(KeyEvent e) { if(e.getKeyChar() == '.') { e.consume(); } } });

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Edit:

As @HovercraftFullOfEels mentioned in the comments, you better use DocumentFilter, see this answer for a good explanation and refer for the tutorial.

Edit 2:
You can try to MaskFormatter:

MaskFormatter formatter = new MaskFormatter(/*Check out the link*/);
JFormattedTextField tf = new JFormattedTextField(formatter );