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  jTextField.addKeyListener(new KeyAdapter() {
                        @Override
                        public void keyTyped(KeyEvent e) {
                            char vChar = e.getKeyChar();
                            if (!(Character.isDigit(vChar)                     
                                    || (vChar == KeyEvent.VK_BACK_SPACE)
                                    || (vChar == KeyEvent.VK_DELETE))) {
                                e.consume();
                            }
                        }
  });