how to filter certain characters in JTextField

Question

How to prevent user from entering certain charcters in 'JTextField' and if enters that character is entered ,do not show it in the textfield

not this is about DocumentFilter, KeyListener is proper only in the case that there is key shortcut with three or more keys pressed in the same time, — mKorbel, Mar 29 '13 at 14:40

score 7 · Answer 1 · answered Mar 29 '13 at 15:37

7

You can either use a JFormattedTextField or create a custom DocumentFilter.

answered Mar 29 '13 at 15:37

camickr

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Implementation example: https://www.rgagnon.com/javadetails/java-0197.html – PAX Jul 20 '21 at 06:07

score -2 · Accepted Answer · edited May 23 '17 at 12:32

-2

JTextField textField = new JTextField(10);
textField.addKeyListener(new KeyAdapter() {
public void keyTyped(KeyEvent e) {
  char c = e.getKeyChar();
  if (//Write your condition here) {
     e.consume();  // ignore event
}});

More on the same here

edited May 23 '17 at 12:32

Community

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1

answered Mar 29 '13 at 12:58

Anuj Balan

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-1, You should NOT be using a KeyListener. Swing has newer and better API's for this problem. For example try pasting text into your text field and see what happens. – camickr Mar 29 '13 at 15:34
1

Use document listener instead – Romantic Electron Sep 24 '13 at 22:44

how to filter certain characters in JTextField

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