how to insert check box

import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;

public class CheckBoxInJTable extends JPanel {

    public CheckBoxInJTable() {
        Object[] columns = new Object[] {"Select", "Name"};
        Object[][] data = new Object[2][2];
        data[0][0] = new Boolean(false);
        data[0][1] = "John";
        data[1][0] = new Boolean(false);
        data[1][1] = "Bill";

        MyTableModel model = new MyTableModel(data, columns);
        JTable table = new JTable(model);

        table.getColumnModel().getColumn(0).setCellEditor(new CheckBoxCellEditor());
        table.getColumnModel().getColumn(0).setCellRenderer(new CWCheckBoxRenderer());
        JScrollPane tableScroller = new JScrollPane(table);
        add(tableScroller);
    }

    private class MyTableModel extends AbstractTableModel {

        private Object[][] data;
        private Object[] columns;

        public MyTableModel(Object[][] data, Object[] columns) {
            this.data = data;
            this.columns = columns;
        }

        public Class getColumnClass(int columnIndex) {
            return data[0][columnIndex].getClass();
        }
        public int getColumnCount() {
            return columns.length;
        }
        public int getRowCount() {
            return data.length;
        }
        public Object getValueAt(int rowIndex, int columnIndex) {
            return data[rowIndex][columnIndex];
        }
              public boolean isCellEditable(int rowIndex, int columnIndex) {
            return (columnIndex == 0 || columnIndex == 2);
        }
    }

    private class CheckBoxCellEditor extends AbstractCellEditor implements TableCellEditor {
        protected JCheckBox checkBox;

        public CheckBoxCellEditor() {
            checkBox = new JCheckBox();
            checkBox.setHorizontalAlignment(SwingConstants.CENTER);
            checkBox.setBackground( Color.white);
        }

        public Component getTableCellEditorComponent(
                JTable table, 
                Object value, 
                boolean isSelected, 
                int row, 
                int column) {

            checkBox.setSelected(((Boolean) value).booleanValue());
            return checkBox;
        }
        public Object getCellEditorValue() {
            return Boolean.valueOf(checkBox.isSelected());
        }
    }

    private class CWCheckBoxRenderer extends JCheckBox implements TableCellRenderer {
    Border border = new EmptyBorder(1,2,1,2);
        public CWCheckBoxRenderer() {
        super();
        setOpaque(true);
        setHorizontalAlignment(SwingConstants.CENTER);
        }

        public Component getTableCellRendererComponent(
        JTable table,
        Object value,
        boolean isSelected,
        boolean hasFocus,
        int row,
        int column) {

        if (value instanceof Boolean) {
        setSelected(((Boolean)value).booleanValue()); 
        setEnabled(table.isCellEditable(row, column));

        if (isSelected) {
        setBackground(table.getSelectionBackground());
        setForeground(table.getSelectionForeground());
        } else {
        setForeground(table.getForeground());
        setBackground(table.getBackground());
        }
        }
        else {
        return null;
        }

        return this; 
        }
         }
        public static void main(String[] args) {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        CheckBoxInJTable test = new CheckBoxInJTable();
        f.getContentPane().add(test);
        f.setSize(350, 350);
        f.show();
    }
}