title: JTextfield not updating when calling `setText()`
body: <p>This is a music player. It works fine, but when I try to create a Jframe around I fail. </p>
  
  <p>I have 3 jTextfields that should present me the playtime and the remaining playtime. But in the program they dont update.</p>
  
  <pre><code>import java.awt.*;
  import java.awt.event.*;
  import java.io.File;
  import java.awt.Container;
  import java.awt.Dimension;
  import java.awt.Toolkit;
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  //
  import javax.sound.midi.InvalidMidiDataException;
  import javax.sound.midi.MidiSystem;
  import javax.sound.midi.MidiUnavailableException;
  import javax.sound.midi.Sequencer;
  import javax.swing.JFrame;
  import javax.swing.JLabel;
  import javax.swing.JTextField;
  import javax.swing.WindowConstants;
  import javax.swing.*;
  import javax.swing.event.*;
  
  /**
    *
    * Beschreibung
    *
    * @version 1.0 vom 26.10.2015
    * @author 
    */
  
  public class test extends JFrame  {
    // Anfang Attribute
    private static File chossen = new File("");
    private static int x=1;
  
    private static JTextField jTextField1 = new JTextField();
    private static JTextField jTextField2 = new JTextField();
    private static JTextField jTextField3 = new JTextField();
    private JLabel jLabel1 = new JLabel();
    private JLabel jLabel2 = new JLabel();
    private JLabel jLabel3 = new JLabel();
    private static JProgressBar jProgressBar1 = new JProgressBar();
    private JButton jButton1 = new JButton();
    private JButton jButton2 = new JButton();
    private JButton jButton3 = new JButton();
    // Ende Attribute
  
    public test(String title) throws MidiUnavailableException { 
      // Frame-Initialisierung
  
      super(title);
  
      setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
      int frameWidth = 574; 
      int frameHeight = 412;
      setSize(frameWidth, frameHeight);
      Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
      int x = (d.width - getSize().width) / 2;
      int y = (d.height - getSize().height) / 2;
      setLocation(x, y);
      setResizable(false);
      Container cp = getContentPane();
      cp.setLayout(null);
      // Anfang Komponenten
  
      jTextField1.setBounds(400, 8, 150, 20);
      cp.add(jTextField1);
      jTextField2.setBounds(400, 32, 150, 20);
      cp.add(jTextField2);
      jTextField3.setBounds(400, 56, 150, 20);
      cp.add(jTextField3);
      jLabel1.setBounds(288, 8, 110, 20);
      jLabel1.setText("Gesamte Dauer");
      cp.add(jLabel1);
      jLabel2.setBounds(288, 32, 110, 20);
      jLabel2.setText("Aktuelle Dauer");
      cp.add(jLabel2);
      jLabel3.setBounds(288, 56, 110, 20);
      jLabel3.setText("Verbleibend");
      cp.add(jLabel3);
      jProgressBar1.setBounds(280, 88, 270, 16);
      cp.add(jProgressBar1);
      jButton1.setBounds(480, 344, 75, 25);
      jButton1.setText("Start");
      jButton1.setMargin(new Insets(2, 2, 2, 2));
      jButton1.addActionListener(new ActionListener() { 
        public void actionPerformed(ActionEvent evt) { 
          try {
              jButton1_ActionPerformed(evt);
          } catch (MidiUnavailableException | InvalidMidiDataException |                      IOException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
          } catch (InterruptedException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
          }
        }
      });
      cp.add(jButton1);
      jButton2.setBounds(400, 344, 75, 25);
      jButton2.setText("Stop");
      jButton2.setMargin(new Insets(2, 2, 2, 2));
      jButton2.addActionListener(new ActionListener() { 
        public void actionPerformed(ActionEvent evt) { 
          try {
              jButton2_ActionPerformed(evt);
          } catch (MidiUnavailableException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
          } catch (InvalidMidiDataException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
          } catch (IOException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
          }
        }
      });
      cp.add(jButton2);
      jButton3.setBounds(8, 8, 267, 73);
      jButton3.setText("Dateiauswahl");
      jButton3.setMargin(new Insets(2, 2, 2, 2));
      jButton3.addActionListener(new ActionListener() { 
        public void actionPerformed(ActionEvent evt) { 
          jButton3_ActionPerformed(evt);
        }
      });
      cp.add(jButton3);
      // Ende Komponenten
  
      setVisible(true);
    } // end of public test
  
    // Anfang Methoden
  
    public static void main(String[] args) throws MidiUnavailableException {
  
      new test("test");
  
    } // end of main
  
    public void test(int zahl) throws MidiUnavailableException,     InvalidMidiDataException, IOException, InterruptedException{
        final Sequencer sequencer = MidiSystem.getSequencer();
        sequencer.open();
        if(zahl==2){
            sequencer.setSequence(MidiSystem.getSequence(chossen));
  
  
              sequencer.setTempoFactor(1);
              sequencer.start();
              System.out.println("start");
              Thread.sleep(5000);
              System.out.println("tettstdt");
  
              x=1;
              while(x==1){
                  long z = sequencer.getMicrosecondLength()/1000/1000;
                  long y=sequencer.getMicrosecondPosition()/1000/1000;
                  jProgressBar1.setMinimum(0);
                  jProgressBar1.setMaximum((int) z);
                  jTextField1.setText(z+"s");
  
  
                  z = sequencer.getMicrosecondLength()/1000/1000;
                  y=sequencer.getMicrosecondPosition()/1000/1000; 
                  System.out.println(z+" "+y);
                  jProgressBar1.setValue((int) y);
                  jTextField2.setText(y+"s");
                  jTextField3.setText("s");
                  if(z-y==0){
                      x=0;
                  }
  
  
              }    
        }else if(zahl==3){
            System.out.println("stop fehlerhaft");
            sequencer.stop();
        }else{
            System.out.println("fehler");
        }
  
  
    }    
  
  
    public void jButton1_ActionPerformed(ActionEvent evt) throws MidiUnavailableException, InvalidMidiDataException, IOException, InterruptedException {
        System.out.println(chossen);
  
  
        test(2);
  
  
  
  
  
  
    } 
  
    public void jButton2_ActionPerformed(ActionEvent evt) throws     MidiUnavailableException, InvalidMidiDataException, IOException {
       // test(3);
  
        }     
    public void jButton3_ActionPerformed(ActionEvent evt) {
        File chossen2 = new File("C:/Users/Eric/workspace/Komplex/midi/"+    (dic()));
        chossen = chossen2;
    } 
  
  
  
    public static String dic() {
  
      File f = new File("C:/Users/Eric/workspace/Komplex/midi");
      JFileChooser fc = new JFileChooser();
      fc.setCurrentDirectory(f);
  
  
      int state = fc.showOpenDialog( null );
  
      if ( state == JFileChooser.APPROVE_OPTION )
      {    
        File file = fc.getSelectedFile();
  
        return file.getName();
      }
      else
  
      return "";
  
  
    }    
  }
  </code></pre>
  
  <p>When I print the information to console it works.   </p>