I would like to implement sorting on JTable by providing column index externally in program. Here is my sample code in which i have initialize JTable, Add one Column and 30 rows to JTable. After rows has been added i am sorting JTable by providing column index 0 but i could not get sorted data. how can i get my first column in sorted order? what's wrong with my code. **Why sortCTableonColumnIndex() method could not sort data for specify column index? ` public class Test {

private JTable oCTable;
private DefaultTableModel oDefaultTableModel;
private JScrollPane oPane;
private JTableHeader oTableHeader;
private TableRowSorter sorter;

public void adddata() {
    for (int i = 0; i < 30; i++) {
        Object[] row = new Object[1];
        String sValueA = "A";
        String sValueB = "A";
        row[0] = "";
        if (i % 2 == 0) {
            if (i < 15) {
                sValueA = sValueA + sValueA;
                row[1] = sValueA;
            } else {
                if (i == 16) {
                    sValueB = "D";
                    row[1] = sValueA;
                } else {
                    sValueB = sValueB + sValueB;
                    row[1] = sValueA;
                }

            }
        } else {
            if (i < 15) {
                sValueB = sValueB + sValueB;
                row[1] = sValueB;
            } else {
                if (i == 17) {
                    sValueB = "C";
                    row[1] = sValueB;
                } else {
                    sValueB = sValueB + sValueB;
                    row[1] = sValueB;
                }

            }
        }

    }
}

public void createTable() {
    oCTable = new JTable();
    oDefaultTableModel = new DefaultTableModel();
    oCTable.setModel(oDefaultTableModel);
    oTableHeader = oCTable.getTableHeader();
    oCTable.setAutoResizeMode(oCTable.AUTO_RESIZE_OFF);
    oCTable.setFillsViewportHeight(true);
    JTable oTable = new LineNumberTable(oCTable);
    oPane = new JScrollPane(oCTable);
    oPane.setRowHeaderView(oTable);
    JPanel oJPanel = new JPanel();
    oJPanel.setLayout(new BorderLayout());
    oJPanel.add(oPane, BorderLayout.CENTER);
    JDialog oDialog = new JDialog();
    oDialog.add(oJPanel);
    oDialog.setPreferredSize(new Dimension(500, 300));
    oDialog.pack();
    oDialog.setVisible(true);

}

public void insert() {
    oDefaultTableModel.addColumn("Name");
    int iColumnPlace = ((DefaultTableModel) oCTable.getModel()).findColumn("Name");
    CellRendererForRowHeader oCellRendererForRowHeader = new CellRendererForRowHeader();
    TableColumn Column = oCTable.getColumn(oTableHeader.getColumnModel().getColumn(iColumnPlace).getHeaderValue());
    Column.setPreferredWidth(300);
    Column.setMaxWidth(300);
    Column.setMinWidth(250);
    Column.setCellRenderer(oCellRendererForRowHeader);



    for (int i = 0; i < 30; i++) {
        Object[] row = new Object[1];
        String sValueA = "A";
        if (i % 2 == 0) {
            if (i < 15) {
                sValueA = sValueA + "a";
                oDefaultTableModel.insertRow(oCTable.getRowCount(), new Object[]{""});
                oDefaultTableModel.setValueAt(sValueA, i, 0);
            } else {
                if (i == 16) {
                    sValueA = sValueA + "b";
                    oDefaultTableModel.insertRow(oCTable.getRowCount(), new Object[]{""});
                    oDefaultTableModel.setValueAt(sValueA, i, 0);
                } else {
                    sValueA = sValueA + "c";
                    oDefaultTableModel.insertRow(oCTable.getRowCount(), new Object[]{""});
                    oDefaultTableModel.setValueAt(sValueA, i, 0);
                }

            }
        } else {
            if (i < 15) {
                sValueA = sValueA + "d";
                oDefaultTableModel.insertRow(oCTable.getRowCount(), new Object[]{""});
                oDefaultTableModel.setValueAt(sValueA, i, 0);
            } else {
                if (i == 17) {
                    sValueA = sValueA + "e";
                    oDefaultTableModel.insertRow(oCTable.getRowCount(), new Object[]{""});
                    oDefaultTableModel.setValueAt(sValueA, i, 0);
                } else {
                    sValueA = sValueA + "f";
                    oDefaultTableModel.insertRow(oCTable.getRowCount(), new Object[]{""});
                    oDefaultTableModel.setValueAt(sValueA, i, 0);
                }

            }
        }

    }
}

public void showTable() {
    createTable();
    insert();
    sortCTableonColumnIndex(0, true);

}

public void sortCTableonColumnIndex(int iColumnIndex, boolean bIsAsc) {
    sorter = new TableRowSorter(oDefaultTableModel);
    List<RowSorter.SortKey> sortKeys = new ArrayList<RowSorter.SortKey>();
    if (bIsAsc) {
        sortKeys.add(new RowSorter.SortKey(iColumnIndex, SortOrder.ASCENDING));
    } else {
        sortKeys.add(new RowSorter.SortKey(iColumnIndex, SortOrder.DESCENDING));
    }
    sorter.setSortKeys(sortKeys);
    oDefaultTableModel.fireTableStructureChanged();
    oCTable.updateUI();


}

public static void main(String[] argu) {
    Test oTest = new Test();
    oTest.showTable();


}

class CellRendererForRowHeader extends DefaultTableCellRenderer {

    public Component getTableCellRendererComponent(JTable table, Object value,
            boolean isSelected, boolean hasFocus, int row, int column) {
        JLabel label = null;
        try {
            label = (JLabel) super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
            if (column == 0) {
                label.setBackground(new JLabel().getBackground());
                label.setForeground(Color.BLACK);
            }
        } catch (RuntimeException ex) {
        }
        return label;

    }
}

class LineNumberTable extends JTable {

    private JTable mainTable;

    public LineNumberTable(JTable table) {
        super();
        mainTable = table;
        setAutoCreateColumnsFromModel(false);
        setModel(mainTable.getModel());
        setAutoscrolls(false);
        addColumn(new TableColumn());
        getColumnModel().getColumn(0).setCellRenderer(mainTable.getTableHeader().getDefaultRenderer());

        getColumnModel().getColumn(0).setPreferredWidth(40);
        setPreferredScrollableViewportSize(getPreferredSize());

    }

    @Override
    public boolean isCellEditable(int row, int column) {
        return false;
    }

    @Override
    public Object getValueAt(int row, int column) {
        return Integer.valueOf(row + 1);
    }

    @Override
    public int getRowHeight(int row) {
        return mainTable.getRowHeight();
    }
}

} `