Refresh/reload Swing components???

Question

Hi all,
I am having a problem with using a Swing frame ... I am calling a command line program on the click of a button in the frame. But as soon as the button is clicked, the swing frame is paused .. the button stays pressed as long as the program ends. My requirement is ... all those messages which are printed on the console should be printed on a Swing component (like a JLabel or JList). I have no problem doing that... but everything is visible only after the program ends... till then the swing frame remains static. Is there any way out??? Can we reload or refresh the JFrame?
thaanx in advance

Answer 1

jif1=new JInternalFrame("JIF Title",false,false,false,false);
                    Container c=jif1.getContentPane();
          c.setLayout(new BorderLayout());
                    listModel = new DefaultListModel();
                    listModel.addElement("First entry");
                              JPanel jp=new JPanel();
                              index=0;
                              list = new JList(listModel);
                              list.setVisibleRowCount(9);
                              Font displayFont = new Font("Arial",Font.PLAIN,11);
                         list.setFont(displayFont);
                              JScrollPane listScrollPane = new JScrollPane(jp);
                              listScrollPane.getViewport().setView(list);
                              list.setVisible(true);
                              c.add(jp, BorderLayout.PAGE_END);
                              jif1.setVisible(true);
                         jif1.setOpaque(true);
                              jdp.add(jif1);
                              jp.add(listScrollPane);
                              repaint();
                              jp.setVisible(true);
                              try
                                        jif1.setSelected(true);
                                   } catch (java.beans.PropertyVetoException e) {}
                              Process proc = Runtime.getRuntime().exec(command);
                              InputStream stderr = proc.getErrorStream();
                              InputStreamReader isr = new InputStreamReader(stderr);
                              BufferedReader br = new BufferedReader(isr);
                              String line = null;
                              System.out.println("<DETAILS>");
                         while((line = br.readLine())!=null)
                                   final String con=line;
                                   final int ind=index;
                              System.out.println(con);
listModel.addElement(con);
                                   list.ensureIndexIsVisible(ind);
                                   index++;
                              repaint();
                              invalidate();
                              validate();
                              repaint();
                              System.out.println("</DETAILS>");
                              int exitVal = proc.waitFor();
                              System.out.println("Value = " + exitVal);
                              if(fil.exists()) System.out.println("File Created");                                                       pb.setString("Creating output file ... ");
                              pb.setIndeterminate(true);
..... this internal frame should be popped up on the click of a button. but.. as soon as the button is clicked, the JFrame is frozen (... paused..) and there is no motion,... even the clicked button remains in the "clicked" state.Its only after the whole process is completed... that the internal frame becomes visible. As you can watch from the code posted above, in the while loop... I'm trying to display the status message both on the concole as well as on the list box. the console messages are displayed correctly.... but as the JFrame is not refreshed.... I'm not able to see the Internal frame as well as the list box atteched to it. please help me out.
thanx in advance.....