Why I cannot see the updated values of JTable in Java UI?

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I have a Download Manager project and when the download starts I must see the progress,speed and other related data about downloads.When the user add a URL , I can see the new download in the JTable but not in progress, I just saw that its progress in 0% and when I click some cell in the list and then again click another cell, I saw that it changed but why I must click it.If I don't click those downoads list' cells, i cannot see the progress.I also used Obsservable class and in the Download class I wrote

 // Notify observers that this download's status has changed.
        public void stateChanged() {
            setChanged();
            notifyObservers();
        }
 

Here is the TableModel.Its object is created in DownloadManagerView(my view class).

import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
import downloadmanager.controller.DownloadManagerSystem;
import downloadmanager.model.Download;
 
// This class manages the download table's data.
class DownloadsTableModel extends AbstractTableModel
        implements Observer {
 
    // These are the names for the table's columns.
    private static final String[] columnNames = {"URL", "Name",
    "Size", "Progress %","Status","Time Left","Transfer Rate","Date"};
 
    // These are the classes for each column's values.
    private static final Class[] columnClasses = {String.class,
    String.class, String.class,JProgressBar.class, String.class, String.class,String.class,Date.class};
 
 
  // Add a new download to the table.
 
    public void addDownloadToTable(Download download) {
 
        download.addObserver(this);
 
        // Fire table row insertion notification to table.
        fireTableRowsInserted(getRowCount() - 1, getRowCount() - 1);
    }
 
    // Get a download for the specified row.
    public Download getDownload(int row) {
        return (Download) DownloadManagerSystem.getArrayList().get(row);
    }
 
    // Remove a download from the list.
    public void clearDownload(int row) {
        DownloadManagerSystem.getArrayList().remove(row);
 
        // Fire table row deletion notification to table.
        fireTableRowsDeleted(row, row);
    }
 
    // Get table's column count.
    public int getColumnCount() {
        return columnNames.length;
    }
 
    // Get a column's name.
    public String getColumnName(int col) {
        return columnNames[col];
    }
 
    // Get a column's class.
    public Class getColumnClass(int col) {
        return columnClasses[col];
    }
 
    // Get table's row count.
    public int getRowCount() {
 
        return DownloadManagerSystem.getArrayList().size();
 
    }
 
    // Get value for a specific row and column combination.
    public Object getValueAt(int row, int col) {
 
        Download download = (Download)DownloadManagerSystem.getArrayList().get(row);
        switch (col) {
            case 0: // URL
                return download.getUrl();
            case 1: // Name
                return download.getName();
            case 2: // Size
                int size = download.getSize();
                return (size == -1) ? "" : Integer.toString(size);
 
            case 3: // Progress
                 return new Float(download.getProgress());
 
            case 4://Status
                return Download.STATUSES[download.getStatus()];
            case 5: //TimeLeft
                return download.getTimeLeft();
            case 6://TransferRate
                return download.getSpeed();
            case 7:// Date
                return download.getDate();
 
 
        }
        return "";
    }
 
  /* Update is called when a Download notifies its
     observers of any changes */
    public void update(Observable o, Object arg) {
        int index = DownloadManagerSystem.getArrayList().indexOf(o);
 
        // Fire table row update notification to table.
        fireTableRowsUpdated(index, index);
    }
}

The arraylist is created in model class DownloadManager.java and I call the ArrayList in the TableModel.Instead of creating two lists I used the Arraylist in the model.Is my problem related with this?
Before model I created the list and I made the adding to list process in view and It was working.But now I must do the project in the MVC structure, so I only created the list in the Model.Now, I cannot see any updated data about the downloads why is it so?I also uploaded my project zip.Please help.