Java Swing MaskFormatter create

import java.awt.FlowLayout;
import java.text.ParseException;

import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.text.MaskFormatter;

public class Main extends JFrame {
  public Main() {
    super("JButton");

    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setLayout(new FlowLayout());
    JLabel nameLabel = new JLabel("Value:");
    //from w  w  w.j  a  va 2s .c o  m
    MaskFormatter fmt = null;
    try {
      fmt = new MaskFormatter("###-##-####");
    } catch (ParseException e) {
      e.printStackTrace();
    }
    fmt.setPlaceholderCharacter('*');
    JFormattedTextField name = new JFormattedTextField(fmt);
    
    JTextField text = new JTextField("Click here to see the validation result");

    getContentPane().add(nameLabel);
    getContentPane().add(name);
    getContentPane().add(text);

  }


  public static void main(String[] args) {
    Main frame = new Main();
    frame.pack();
    frame.setVisible(true);
  }
}