Multiple Radio Buttons in a JTable cell

Adam Hamlet Tue, 11 Jun 2002 13:42:14 -0700

Here is a small program which creates a JTable with 3 Radio Buttons per cell. It works fine under Java SDK 1.3.1, but when I compile it under Java SDK 1.4.0.1, the Radio Buttons don't work properly! Can anyone suggest why this is the case? Is there a bug with Java 1.4? And more importantly, is there a work-around? Your suggestions will be greatly appreciated...

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

public class JRadioButtonTableExample2 extends JFrame {

public JRadioButtonTableExample2(){
super( "JRadioButtonTable Example" );

DefaultTableModel dm = new DefaultTableModel();
dm.setDataVector(
new Object[][]{
{"1",new Integer(-1)},
{"2",new Integer(-1)},
{"3",new Integer(0)},
{"4",new Integer(1)},
{"5",new Integer(2)}},
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 JCheckBox(),
new RadioButtonPanel(answer))
);
JScrollPane scroll = new JScrollPane(table);
getContentPane().add( scroll );
}

// Cell base
class RadioButtonPanel extends JPanel {
JRadioButton[] buttons;

RadioButtonPanel(String[] str) {
setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
buttons = new JRadioButton[str.length];
for (int i=0; i<buttons.length; i++) {
buttons = new JRadioButton(str);
buttons.setFocusPainted(false);
add(buttons);
}
}

public void setSelectedIndex(int index) {
for (int i=0;i<buttons.length;i++) {
buttons.setSelected(i == index);
}
}

public int getSelectedIndex() {
for (int i=0; i<buttons.length; i++) {
if (buttons.isSelected()) {
return i;
}
}
return -1;
}

public JRadioButton[] getButtons() {
return buttons;
}
}

class RadioButtonRenderer extends RadioButtonPanel
implements TableCellRenderer {
RadioButtonRenderer(String[] strs) {
super(strs);
}

public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
if (value instanceof Integer) {
setSelectedIndex(((Integer)value).intValue());
}
return this;
}
}

class RadioButtonEditor extends DefaultCellEditor
implements ItemListener {
RadioButtonPanel panel;

public RadioButtonEditor(JCheckBox checkBox,RadioButtonPanel panel) {
super(checkBox);
this.panel = panel;
ButtonGroup buttonGroup = new ButtonGroup();
JRadioButton[] buttons = panel.getButtons();
for (int i=0; i<buttons.length; i++) {
buttonGroup.add(buttons);
buttons.addItemListener(this);
}
}

public Component getTableCellEditorComponent(JTable table, Object value,
boolean isSelected, int row, int column) {
if (value instanceof Integer) {
panel.setSelectedIndex(((Integer)value).intValue());
}
return panel;
}

public Object getCellEditorValue() {
return new Integer(panel.getSelectedIndex());
}

public void itemStateChanged(ItemEvent e) {
super.fireEditingStopped();
}
}

public static void main(String[] args) {
JRadioButtonTableExample2 frame = new JRadioButtonTableExample2();
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
frame.setSize( 230, 140 );
frame.setVisible(true);
}
}

Multiple Radio Buttons in a JTable cell

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