Problema JFormattedTextField

import javax.swing.*;
import javax.swing.text.*;
import java.awt.*;
import java.text.*;

public class Teste extends JFrame {
        JFormattedTextField tf;
        NumberFormatter nf;
        DecimalFormat df;

        public Teste() {
                this.setSize(200, 200);
                this.setDefaultCloseOperation(EXIT_ON_CLOSE);
                
                df = new DecimalFormat("#,##0.00");
                df.setMaximumIntegerDigits(5);
                nf = new NumberFormatter(df);
                nf.setAllowsInvalid(false);
                nf.setOverwriteMode(false);                      

                tf = new JFormattedTextField();
                tf.setHorizontalAlignment(JTextField.RIGHT);

                nf.install(tf);
          
                this.getContentPane().setLayout(new BorderLayout());
                this.getContentPane().add(tf, BorderLayout.NORTH);

                this.show();
        }

        public static void main(String[] args) {
                new Teste();
        }
}