I am working on creating a jradiobutton group using JTable. Here is a brief definition of the problem.

My program gives an output like this:-

Questions         Answers
1                      radiobtn1     radiobtn2   radiobtn3
2                      radiobtn1     radiobtn2   radiobtn3
3                      radiobtn1     radiobtn2   radiobtn3

I am able to set horizontal control that only 1 radio button can be selected but how do I control vertically ?
As per my requirement I should allow only 1 radiobutton to be selected in a field. Even though horizontally I am doing that.

In short I mean both in rows and columns only 1 radiobutton should be selected.

Below is my code. What changes should I do ?
Also I wanted to use checkbox in for the 3rd button instead of radiobutton how can I do do that ? Since I am making a group of buttons here. Is it possible to do that ?
I mean somthing like this :-

Questions        Answers
1                      radiobtn1     radiobtn2   checkbox3
2                      radiobtn1     radiobtn2   checkbox3
3                      radiobtn1     radiobtn2   checkbox3
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.JRadioButton;
import javax.swing.JButton;
public class JRadioButtonTableExample2 extends javax.swing.JFrame {
	public JRadioButtonTableExample2() {
		super("JRadioButtonTable Example");
		DefaultTableModel dm = new DefaultTableModel(new Object[][]{
                                 {new String("Andrew")},
				 {new String("Bolon")},
				 {new String("Peter")},
				 {new String("Mathew")},
			         {new String("Austin")}},
		    new Object[]{"Question", "Answer"});
		JTable table = new JTable(dm);
		String[] answer = {"A", "B", "C"};
		table.getColumn("Answer").setCellRenderer(new RadioButtonRenderer(answer));
		table.getColumn("Answer").setCellEditor(new RadioButtonEditor(new RadioButtonPanel(answer)));
                JButton myButton = new JButton("MyQuestion");
		setContentPane(new JScrollPane(table));
	// Cell base
	class RadioButtonPanel extends JPanel {
		private JRadioButton[] buttons;
		private JRadioButton noSelectionButton;
		RadioButtonPanel(String[] str) {
			setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
			buttons = new JRadioButton[str.length];
			ButtonGroup group = new ButtonGroup();
			noSelectionButton = new JRadioButton();
			for (int i = 0; i < buttons.length; i++) {
				buttons[i] = new JRadioButton(str[i]);
		public void addActionListener(ActionListener anActionListener) {
			for (int i = 0; i < buttons.length; i++) {
		public void removeActionListener(ActionListener anActionListener) {
			for (int i = 0; i < buttons.length; i++) {
		public void setSelectedIndex(int index) {
			if (index < 0 || index >= buttons.length) {
			for (int i = 0; i < buttons.length; i++) {
				if (i == index) {
		public int getSelectedIndex() {
			for (int i = 0; i < buttons.length; i++) {
				if (buttons[i].isSelected()) {
					return i;
			return -1;
		public JRadioButton[] getButtons() {
			return buttons;
	class RadioButtonRenderer extends RadioButtonPanel implements TableCellRenderer {
		RadioButtonRenderer(String[] strs) {
		public Component getTableCellRendererComponent(JTable table,
		 Object value, boolean isSelected, boolean hasFocus, int row,
			int column) {
			if (value instanceof Integer) {
			return this;
	class RadioButtonEditor extends AbstractCellEditor implements TableCellEditor, ActionListener {
		private RadioButtonPanel theRadioButtonPanel;
		public RadioButtonEditor(RadioButtonPanel aRadioButtonPanel) {
			theRadioButtonPanel = aRadioButtonPanel;
		public Component getTableCellEditorComponent(JTable table,
		 Object value, boolean isSelected, int row, int column) {
			if (value instanceof Integer) {
				theRadioButtonPanel.setSelectedIndex(((Integer) value).intValue());
			return theRadioButtonPanel;
		public Object getCellEditorValue() {
			return new Integer(theRadioButtonPanel.getSelectedIndex());
		public void actionPerformed(ActionEvent e) {
	public static void main(String[] args) {
		JRadioButtonTableExample2 frame = new JRadioButtonTableExample2();
		frame.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
		frame.setSize(230, 140);


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