Checking for duplicate rows in jTable data

Hi,

Below is code I have written to to help do the following:

A selection is made from a jComboBox to be added to a jTable, it is then checked to see which one of the three conditions it meets below: if table is empty, it is added. If the item selected from the combo box exists in the table, the existing row has its qty value increased by one. Or if its not already on the table it is added.

But what I am geting is very strange behaviour as follows:

1. First row is added to table, with a value of "200" (should be "100" as table was empty prior to this selection).

2. A second item is selected form the combo box, the first row (above) has its value changed to "100" (this should happen on first selection). Also the second item selected from the combo box is added to the table twice (two identical rows) with a value of "300", value is correct but should only be one row.

3. Third selection from combo does as in 2 above, so value is correct but should only be one row

4. A fourth selection from the combo box is selected, this time to match an exisiting row in the table, instead of updating the value in the existing row it also adds two rows with a value of "300"...


I think maybe I have the loops wrong, but I am now well behind on a project trying to resolve this, so any help owould be greatly received...

Thanks in advance


      final DefaultTableModel model = (DefaultTableModel)main.tillPanel.tblTillSale.getModel();
      //populate the combo box
      for (int d = 0; d < roundStockObj.length ; d++) {
            main.tillPanel.cmbTillProdSelect.addItem(roundStockObj[d].getDescription());
      }
      //add selection listener to combo
      main.tillPanel.cmbTillProdSelect.addItemListener(new ItemListener()
      {
            public void itemStateChanged(ItemEvent e)
            {
                  String[] addSelectedItem = new String[4];
                  selectedItem = main.tillPanel.cmbTillProdSelect.getSelectedItem();
                  
                  for (int d = 0; d < roundStockObj.length; d++) {
                        //when selction form combo is matched, an array is created to hold the row data
                        if (roundStockObj[d].getDescription().equals(selectedItem)) {
                              addSelectedItem[0] = roundStockObj[d].getDescription();
                              addSelectedItem[2] = Double.toString(roundStockObj[d].getPrice()).trim();
                              addSelectedItem[3] = Double.toString(roundStockObj[d].getPrice()).trim();
                        }
                  }
                  main.tillPanel.tblTillSale.removeRowSelectionInterval(0, model.getRowCount());
                  
                  //if table is empty
                  for (int rowCount = 0 ; rowCount <= model.getRowCount(); rowCount++) {
                        if (model.getRowCount() == 0 ) {
                              addSelectedItem[1] = "100";
                              model.addRow(new String[]{addSelectedItem[0], addSelectedItem[1], addSelectedItem[2], addSelectedItem[3]});
                              //main.tillPanel.tblTillSale.getModel().setValueAt(selectedItem, tillSelectedRow, tillSelectedRow);
                              main.tillPanel.lblTotPrice.setText("100");
                              break;
                        }
                        // look for duplicate row and if found increase total column of existing row, and not add this selection
                        if(addSelectedItem[0].equals(main.tillPanel.tblTillSale.getValueAt(rowCount, 0))) {
                              main.tillPanel.lblTotPrice.setText("200");
                              int currentValue = Integer.parseInt(addSelectedItem[1].trim());
                              addSelectedItem[1] = "200";
                              model.setValueAt(addSelectedItem[1], rowCount, 1);
                              break;
                        }
                        //if no duplicate found add this row to the table
                        else {
                              addSelectedItem[1] = "300";
                              model.addRow(new String[]{addSelectedItem[0], addSelectedItem[1], addSelectedItem[2], addSelectedItem[3]});
                              main.tillPanel.lblTotPrice.setText("300");
                              break;
                        }
                  }

                  //clear the current selection array of row data
                  for (int index = 0; index < 4; index++) {
                        ddSelectedItem[index] = null;
                  }
            }
      });