TableModel problem

Question

Hi to everybody,
i am new. I hope somebody can help me to solve my little problem. I want to change a value on a certain row in my table.
If I press the button check updates, a url connection should be started and it should be change the value on the selected row on the second colum if the url content has changed.
If i launch the program, the value should be set with "Waiting for updates...". Then if i press the button check updates it should return depends on the result "Changed" or "not changed". How can i do this?
I think with the setValue method, but how? How can I select the column?
Thanks,
P.A.
My code for the TableModel:
import java.awt.Color;
import java.util.Date;
import java.util.Observable;
import java.util.Observer;
import javax.swing.JProgressBar;
import javax.swing.table.AbstractTableModel;
//class TableModel jTblUrl
public class TableModelListUrl extends AbstractTableModel implements Observer{
private final String COLS[] = {"Downloaded urls","State"}; // Name of the columns
private final Class[] columnClasses = {String.class, JProgressBar.class};
private UrlList list = new UrlList(); //store urls in this container
private Color color;
// number of the columns
public int getColumnCount() {  
     return COLS.length;
// get number of rows
public int getRowCount() {
     return list.getSize();
// get Column Name
public String getColumnName(int col) {               
     return COLS[col] ;
// get Column class
public Class getColumnClass (int col) {                
     return columnClasses[col];
//     get the Value      
public Object getValueAt(int row, int col) {
     UrlConnection uc = list.getUrls(row);
     String value;
     switch (col) {
          case 0: // URL
               return uc.adress;
          case 1: //
          return value = new String("Waiting for updates...");
     return "";
public void setValue( Object avalue, int row, int col )
UrlConnection uc = list.getUrlsRow(row);
if ( uc.IsChanged()==true)
avalue= new String("changed");
else
avalue= "not changed";
fireTableDataChanged();
// is cell Editable
public boolean isCellEditable(int row, int col){
     return false;          
// delete an url, implies changes in the table
public void delete(int row){
     list.delUrls(row);
     fireTableRowsDeleted(row, row);
//clear all urls in the table
public void clear() {      
     list.clearUrls();
fireTableRowsDeleted(-1, getRowCount());
public void update(Observable check, Object u) {
          int index = list.indexOf(u);
          if (index != -1)
          fireTableRowsUpdated(index, index);
}

Answer 1

Thanks for the help, but now I have made it in this way, but i do not understand the setRowStatus method:
What should I write in the setRowStatus method?
//     get the Value      
public Object getValueAt(int row, int col) {
     UrlConnection uc = list.getUrls(row);
     String value;
     switch (col) {
          case 0: // URL
               return uc.adress;
          case 1: //
               if (uc.getChanged()==true){
                    return new String("Changed");
               else if ((uc.getChanged())==false){
                    return new String ("Nothing changed");
               else
          return value = new String("Waiting for cheking...");     
     return "";
     * Called to display row status change.
     public void setRowStatus(int row ,int newStatus) {
     if(downLoadRowStatus[row] == newStatus)// ??
     return;//??
     downLoadRowState[row] = newStatus;//??
     fireTableCellUpdated(row, 1);
     }