Trying to get Row numbes to display in a DefaultTableCellRenderer

Question

Hello all.
I have extended the defaultablecellrenderer and have got my JTanle to use it. Howeve, i want to represent the rows of the tables as well as the colums...so far i have managed to colour each row (by colour the first colum of the JTable) is there a wat to number these values, give the number of rows as an arguement? Many thanks, Rupesh.
I call the renderer by
_renderer = new MyTableCellRenderer();
myTable.setDefaultRenderer(Object.class, _renderer );
Btw - when i enter data into my table, it just disappears as soon as i click on another cell..is this because i havent implemented a setValue method in the renderer yet?
import javax.swing.*;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.border.*;
import java.awt.Component;
import java.awt.Color;
import java.awt.Rectangle;
import java.util.*;
import java.awt.*;
public class MyTableCellRenderer extends DefaultTableCellRenderer{
     private Font cellFont;
     public MyTableCellRenderer() {
          super();
     private boolean isHeaderCell(int row, int column){return column == 0;}
     public Component getTableCellRendererComponent (JTable myTable, Object value, boolean isSelected, boolean hasFocus, int row, int column){
          if (isSelected && !(isHeaderCell(row,column))){
               super.setForeground(myTable.getSelectionForeground());
               super.setBackground(myTable.getSelectionBackground());
          else{
               if (isHeaderCell (row, column)){
                    super.setBackground(Color.lightGray);
                    super.setForeground(myTable.getForeground());
               else {
               super.setForeground(myTable.getForeground());
               super.setBackground(myTable.getBackground());
     cellFont = new Font("Times", Font.PLAIN, 20);
     setFont(cellFont);
     if (hasFocus) {
          setBorder(UIManager.getBorder("Table.focusCellHighlightBorder"));
          if (myTable.isCellEditable(row,column)) {
               super.setForeground(UIManager.getColor("Table.focusCellForeground"));
               super.setBackground(UIManager.getColor("Tale.focusCellBackground"));
     else {setBorder(noFocusBorder);}
     Color bDis = getBackground();
     boolean colourEquals = (bDis != null) && (bDis.equals(myTable.getBackground()) ) & myTable.isOpaque();
     setOpaque (!colourEquals);
     return this;
}

Answer 1

Maybe this is what you are looking for. This code adds a line number for each row in the table:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
public class LineNumberTable extends JTable
    protected JTable mainTable;
    public LineNumberTable(JTable table)
        super();
        mainTable = table;
        setModel(new RowNumberTableModel());
        setPreferredScrollableViewportSize(getPreferredSize());
        getColumnModel().getColumn(0).setPreferredWidth(50);
        getColumnModel().getColumn(0).setCellRenderer( mainTable.getTableHeader().getDefaultRenderer() );
    public int getRowHeight(int row)
        return mainTable.getRowHeight();
    class RowNumberTableModel extends AbstractTableModel
        public int getRowCount()
             return mainTable.getModel().getRowCount();
        public int getColumnCount()
            return 1;
        public Object getValueAt(int row, int column)
            return new Integer(row + 1);
    public static void main(String[] args)
        Object[][] data = { {"1", "A"}, {"2", "B"}, {"3", "C"} };
        String[] columnNames = {"Number","Letter"};
        DefaultTableModel model = new DefaultTableModel(data, columnNames);
        JTable table = new JTable(model);
        JScrollPane scrollPane = new JScrollPane( table );
        JTable lineTable = new LineNumberTable( table );
        scrollPane.setRowHeaderView( lineTable );
        JFrame frame = new JFrame( "Line Number Table" );
        frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        frame.getContentPane().add(scrollPane, BorderLayout.CENTER);
        frame.setSize(400, 300);
        frame.setVisible(true);
}