Disable input some symbols to JTextField

Question

How can I disable input of any symbol except digits to JTextField?

Answer 1

This worked for me. Have a look.

public void keyTyped(KeyEvent e)
{

  char c = e.getKeyChar();

  if (!((c >= '0') && (c <= '9') ||    
     (c == KeyEvent.VK_BACK_SPACE) ||
     (c == KeyEvent.VK_DELETE))) {

        getToolkit().beep();

        e.consume();

  }

}