Java - While y JFrame

package unsm;

import javax.swing.JDesktopPane;

import javax.swing.JFrame;

import javax.swing.JProgressBar;

public class Unsm extends JFrame {

    private int nivel= 0 ;

    private JProgressBar barra;

    public Unsm(){

    JDesktopPane fondo = new JDesktopPane();

    barra  = new JProgressBar();

    barra.setBounds(10,20,450,10);

    fondo.add(barra);

    this.add(fondo);

    this.setTitle("Titulo");

    this.setSize(500,500);

    llenarbarra();

    }

    public void llenarbarra(){

         int i = 2;

         while (i<=100) {

              if((i%10)==0){

              nivel = nivel +10;

              barra.setValue(nivel);

         }

              try {

                  Thread.sleep(200);

             } catch (Exception e) {

                  System.out.println("ERROR "+e);

             }

             System.out.println(" % "+nivel+" valor i"+i);

        i++;

     }

    }

    public static void main(String[] args) {

       Unsm u = new Unsm();

       u.show();

    }

}