Java JFormattedTextField create from SimpleDateFormat

import java.awt.BorderLayout;
import java.text.DateFormat;
import java.text.SimpleDateFormat;

import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class Main {
   public static void main(final String args[]) {
      JFrame frame = new JFrame("Formatted Example");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

      JPanel datePanel = new JPanel(new BorderLayout());
      DateFormat format = new SimpleDateFormat("yyyy");
      JFormattedTextField dateTextField = new JFormattedTextField(format);
      datePanel.add(dateTextField, BorderLayout.CENTER);
      frame.add(datePanel, BorderLayout.NORTH);

      frame.add(new JTextField(), BorderLayout.SOUTH);
      frame.setSize(250, 100);/*from w  w  w . j  a  va2s  .  c om*/
      frame.setVisible(true);
   }
}