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BigDecimalFormatter For JFormattedTextfield

DZone's Guide to

BigDecimalFormatter For JFormattedTextfield

Free Resource
This BigDecimalFormatter tries to parse the text as BigDecimal for the current locale. It uses the BigDecimal(String) constructor to keep the number of decimals from the text.

public class BigDecimalFormatter extends NumberFormatter {
    public Object stringToValue(String text) throws ParseException {
        if("".equals(text.trim())) {
             return null;
         char ds = getDefaultLocaleDecimalSeparator();

         try {
             String val = text;
             if(ds != '.') {
                 val = val.replace(".", "").replace(ds, '.');
             return new BigDecimal(val);
         } catch(NumberFormatException e) {
             return null;

    public String valueToString(Object value) throws ParseException {
        return super.valueToString(value);

    private char getDefaultLocaleDecimalSeparator() {
          DecimalFormatSymbols symbols = new DecimalFormat("0").getDecimalFormatSymbols();
          char ds = symbols.getDecimalSeparator();
          return ds;


public class BigDecimalFormatterFactory extends JFormattedTextField.AbstractFormatterFactory {
    public JFormattedTextField.AbstractFormatter getFormatter(JFormattedTextField tf) {
        return new BigDecimalFormatter();

Use it like this:

bigdecimalfield.setFormatterFactory(new BigDecimalFormatterFactory());

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