Java JTable setCellRenderer

    import java.awt.*;
    import java.text.DecimalFormat;
    import java.text.DecimalFormatSymbols;
    import javax.swing.*;
    import javax.swing.table.DefaultTableCellRenderer;

    public class SimpleTableExample extends JFrame {
        private final JPanel topPanel;
        private final JTable table;
        private final JScrollPane scrollPane;

        public SimpleTableExample() {
            setTitle( "Simple Table Application" );
            setSize( 300, 200 );
            setBackground( Color.gray );
            setDefaultCloseOperation(JDialog.EXIT_ON_CLOSE);

            topPanel = new JPanel();
            topPanel.setLayout( new BorderLayout() );
            getContentPane().add( topPanel );


            table = new JTable();
            table.setModel(new javax.swing.table.DefaultTableModel(
                new Object [][] {{"IT01", "Shoes",  new Double(3233233.87)}, {"IT02", "Hammer",  new Double(321233.87)}},
                new String [] { "ID", "ITEM", "PRICE" }
            ) {
            Class[] types = new Class [] {
                java.lang.String.class, java.lang.String.class, java.lang.Double.class
            };
            public Class getColumnClass(int columnIndex) {
                return types [columnIndex];
            }
        });

        table.getColumnModel().getColumn(2).setCellRenderer(new DecimalFormatRenderer() );

        scrollPane = new JScrollPane(table);
        topPanel.add(scrollPane, BorderLayout.CENTER);
    }

    public static void main( String args[] ) {
        SimpleTableExample mainFrame = new SimpleTableExample();
        mainFrame.setVisible( true );
    }

    static class DecimalFormatRenderer extends DefaultTableCellRenderer {
        private static final DecimalFormatSymbols dfs = new DecimalFormatSymbols() ;
        private static final DecimalFormat dfCurrency = new DecimalFormat("#,###.##");

        public DecimalFormatRenderer() {
            super();

            dfs.setDecimalSeparator(',');
            dfs.setGroupingSeparator('.');
            dfCurrency.setDecimalFormatSymbols(dfs);
        }

        public Component getTableCellRendererComponent(
            JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
                // First format the cell value as required

                value = dfCurrency.format((Number)value);

                // And pass it on to parent class

                return super.getTableCellRendererComponent(
                    table, value, isSelected, hasFocus, row, column );
            }
        }
    }