Progress bar and frame not showing until complete!

Hi Experts,

I've been using many tutorials and so far haven't been able to get my progress bar working correctly.  At current I have the attached class (minus a couple of non important methods).

This class is then declared as :
     protected DataProcessing process = null;
and used with the following two lines of code:
     process = new DataProcessing(header.iNeuron);
     process.getPeaks(afNorm, fMinValue, fMaxValueAbsolute, afPeaks, abPos);

Yet even though I have the frame to open up and the processing to be in a background thread which I understand is important because if not the GUI can not be updated with the current progress.  Even though, the frame, along with the progress bar are not showing until the progress is complete!

Any suggestions?
Thanks
James

package Data;
 
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.Serializable;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.SwingUtilities;
import javax.swing.SwingWorker;
import javax.swing.UIManager;
 
 
 
public class DataProcessing extends JFrame implements Serializable, PropertyChangeListener
{
    private JProgressBar progressBar = null;
    private GridBagConstraints m_c = new GridBagConstraints();
    private JPanel m_optionPanel = new JPanel();
    private Task task = null;
    
    private float[][][] afNorm = null;
    private float fMin = 0.0f;
    private float fMax = 0.0f;
    private float[][] afPeaksOut = null;
    private int[][]abPosOut = null;
    
    class Task extends SwingWorker<Void, Void> {
        /*
         * Main task. Executed in background thread.
         */
        @Override
        public Void doInBackground() {
            setProgress(0);
            float fPeak;
            for (int x = 0; x < afNorm.length; x++) {
                for (int y = 0; y < afNorm[x].length; y++)
                {
                    fPeak = 0.0f;
                    for (int z = 0; z < afNorm[x][y].length; z++) {
                        if (afNorm[x][y][z] >= fMin && afNorm[x][y][z] <= fMax){
                            if (fPeak < afNorm[x][y][z]) {
                                fPeak = afNorm[x][y][z];
                                abPosOut[x][y] = z;
                            }
                        }
                    }
                    afPeaksOut[x][y] = fPeak;
                }
                setProgress(x);
            }
            return null;
        }
 
        /*
         * Executed in event dispatching thread
         */
        @Override
        public void done() {
            // nothing!
        }
    }  
    
        /**
     * Create the GUI and show it. As with all GUI code, this must run
     * on the event-dispatching thread.
     */
    private void createAndShowGUI(int maximum) {  
        //setup the look and feel to the local computer
        try {UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
            SwingUtilities.updateComponentTreeUI(this);}
        catch (Exception e) {System.err.println("L&F Error: " + e);}
        
        this.setBounds(400, 400, 0, 0);
        this.setPreferredSize(new Dimension(300, 100));
        this.setResizable(false);
        
        // PROGRESS BAR
        progressBar = new JProgressBar(0, maximum);
        progressBar.setValue(0);
        
        // setup layout
        m_optionPanel.setLayout(new GridBagLayout());
        
        // add components to the pane!
        m_c.anchor = GridBagConstraints.LINE_START;
        m_c.weighty = 0.0;
        // DISPLAY
        m_c.gridx = 0;
        m_c.gridy = 0;
        m_c.gridwidth = 20;
        m_optionPanel.add(progressBar, m_c); 
        
        // Setup the JFrame
        setContentPane(m_optionPanel);
        setBackground(Color.white);
        setTitle("Processing ...");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
 
        pack();
        System.out.println("created");
    }
    
    public DataProcessing(final int maximum) {      
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI(maximum);
            }
        });
    }
    
    /*Self Contained function to derive peaks in window from all correls*/
    public void getPeaks(float[][][] afNormIn, float fMinIn, float fMaxIn,
            float[][] afPeaksOutIn, int[][] abPosOutIn)
    {
        afNorm = afNormIn;
        fMin = fMinIn;
        fMax = fMaxIn;
        afPeaksOut = afPeaksOutIn;
        abPosOut = abPosOutIn;
        
        task = new Task();
        task.addPropertyChangeListener(this);
        task.execute();
    }
 
    public void propertyChange(PropertyChangeEvent evt) {
        if ("progress" == evt.getPropertyName()) {
            int progress = (Integer) evt.getNewValue();
            progressBar.setValue(progress);
        }
    }
}

Select allOpen in new window