TextField totalAmountDueTextField = new TextField("0.00");
Pattern validDoubleText = Pattern.compile("-?\d*(\.\d{0,2})?");
TextFormatter<Double> textFormatter = new TextFormatter<>(new DoubleStringConverter(), 0.00,
        change -> {
            String newText = change.getControlNewText() ;
            if (validDoubleText.matcher(newText).matches()) {
                return change ;
            } else return null ;
        });
totalAmountDueTextField.setTextFormatter(textFormatter)

totalAmountDueTextField.focusedProperty().addListener(new ChangeListener() {
        @Override
        public void changed(ObservableValue o, Object oldVal, Object newVal) {
            DecimalFormat format = new DecimalFormat("#,##0.00");
            String formattedText = format.format(Double.parseDouble(totalAmountDueTextField.getText()));
            System.out.println(formattedText);
            totalAmountDueTextField.setText(formattedText);
        }
    });