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JDatePicker Date Formatting

I installed JDatePickerin my application, but I want the date to be formatted as YYYY_MM_DD
Currently, the date format is the default format. There is a class Wed Jul 08 15:17:01 ADT 2015
from this guide that formats the date as follows.

package net.codejava.swing;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;

import javax.swing.JFormattedTextField.AbstractFormatter;

public class DateLabelFormatter extends AbstractFormatter {

    private String datePattern = "yyyy-MM-dd";
    private SimpleDateFormat dateFormatter = new SimpleDateFormat(datePattern);

    @Override
    public Object stringToValue(String text) throws ParseException {
        return dateFormatter.parseObject(text);
    }

    @Override
    public String valueToString(Object value) throws ParseException {
        if (value != null) {
            Calendar cal = (Calendar) value;
            return dateFormatter.format(cal.getTime());
        }

        return "";
    }

}

So I added the class to my package, and the Swing application has the correct constructor

JDatePickerImpl datePicker = new JDatePickerImpl(datePanel, new DateLabelFormatter());

, datePicker.getModel().getValue().toString() .
, DateLabelFormatter valueToString, .
?
, ?
[ ?] ?

+4
2

datePicker.getJFormattedTextField().getText()

datePicker

+4

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