JProgressBar and Thread problem

[somnio85]

hi
im trying to make a GUI for a HTML parser
The problem is JProgressBar is not showing the progress, only updates when the
total have been downloaded.
I have been reading and the problem seems to be the Main thread is bloked by the actionperformed so i did try to convert the personalParser into a new Thread but still didnt work
the basic structure of my app is

class gui{
    JProgressBar preloader;
    JButton download;
    JLabel  display;
      //other components .....
    public gui(){
         preloader=new JProgressBar ();
         download=new JButton ("Download");
         display=new JLabel  ("");
         myButtontListener  mbl=new myButtontListener  (preloader);
         download.addActionListener(mbl);
         //frame.add etc .......
    }
}
class myButtontListener  implements ActionListener{
    JProgressBar preloader;
    personalParser myParser;
    JLabel  display;
   public myButtontListener  (JProgressBar bar, JLabel lbl){
    preloader;=bar;
    display=lbl;
   }
    public void actionPerformed(ActionEvent event) {
      if( event.getActionCommand() == "Download"  ){    
           myParser=new personalParser ("http://server.com/", preloader);
           String [] HtmlCode=myParser.getContentInArray();
           display.setText(HtmlCode[5]);
      }

    }
}

class personalParser {
    JProgressBar preloader;
    String url
    public personalParser (String url,JProgressBar bar ){
      preloader=bar;
      this.url=url;
      
    }

    public String[] getContentInArray(){
       String [] code=new String[100];
       //some net connections ........

       //here i use a loop to fill the array and need to set the JProgressBar value
      //to display how many blocks of a especific tag have been downloaded and
      //added to the array
       String TagBlock="";
       int count=0;
       while ((TagBlock = input.readLine()) != null) {
           count++;
           code[count]=TagBlock;
           preloader.setValue ( count );
       }
       return code
    }
 
}

How can i fix this ?

[destin]

One approach is to use a Runnable interface. Take this class for example:

public class JProgressBarDemo extends JApplet implements Runnable {
    private JProgressBar progressBar = new JProgressBar();
    
    public void init() {
        new Thread(this).start();
    }

    public void run() {
        while (progressBar.getValue() < progressBar.getMaximum()) {
            progressBar.setValue(progressBar.getValue() + 1);
        }
    }
}

That can also be written as:

public class JProgressBarDemo extends JApplet {
    private JProgressBar progressBar = new JProgressBar();
    
    public void init() {
        new Thread(new Runnable() {
            public void run() {
                while (progressBar.getValue() < progressBar.getMaximum()) {
                    progressBar.setValue(progressBar.getValue() + 1);
                }
            }
        }
    }
}

[somnio85]

thanks destin
that really help me.
Now my parser implements Runnable then when the parsing is complete i kill the thread and the progress bar is updating correctly.