Java - refrescar jlabel

private void btnComenzarActionPerformed(java.awt.event.ActionEvent evt) {

        for (Integer i=0;i<10000;i++) {

            this.JLabel1.setText(i.toString());

        }

import java.awt.*;

import javax.swing.*;

import javax.swing.event.*;

import java.awt.EventQueue.*;

public class Nuevo extends JFrame {

   public Nuevo() {

       super("Hola Mundo");

       Container con = getContentPane();

       con.setLayout(new GridLayout(2,1));

       cuenta = new JLabel("Cuenta");

       barra = new JProgressBar();

       barra.setMinimum(0);

       barra.setMaximum(100);

       barra.setStringPainted(true);

       boton = new JButton("Inicia");

       boton.addActionListener(e->{

	       boton.setEnabled(false);

	       Thread t1 = new Thread(Nuevo::iniciaBarra);

	       t1.start();

	   });

       con.add(cuenta);

       con.add(barra);

       con.add(boton);

       setSize(400,80);

       setLocationRelativeTo(null);

       setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

       }

      public static void main(String... args) {

	  EventQueue.invokeLater(()->{

		  new Nuevo().setVisible(true);

	      });

      }

    public static void iniciaBarra() {

	for (int i = 0; i < 100; i++) {

	    try {

		barra.setValue(i);

		cuenta.setText(String.valueOf(i));

		cuenta.setForeground(new Color(0 , 0 , 145));

		if(i == 99) {

		    Thread.interrupted();

		    cuenta.setText("0");

		    barra.setValue(0);

		    boton.setEnabled(true);

		    System.out.printf("%s%n" , "Hilo terminado");

		}

		Thread.sleep(100);

	    } catch(InterruptedException e) {

		System.out.printf("%s%n",e.getLocalizedMessage());

	    }

	}

    }

    private static JLabel cuenta;

    private static JProgressBar barra;

    private static JButton boton;

}