A ButtonGroup voting booth
/*
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly
*/
// SimpleButtonGroupExample.java
//A ButtonGroup voting booth.
//
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.AbstractButton;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JRadioButton;
public class SimpleButtonGroupExample {
public static void main(String[] args) {
// Some choices
JRadioButton choice1, choice2, choice3;
choice1 = new JRadioButton("Bach: Well Tempered Clavier, Book I");
choice1.setActionCommand("bach1");
choice2 = new JRadioButton("Bach: Well Tempered Clavier, Book II");
choice2.setActionCommand("bach2");
choice3 = new JRadioButton("Shostakovich: 24 Preludes and Fugues");
choice3.setActionCommand("shostakovich");
// A group, to ensure that we only vote for one.
final ButtonGroup group = new ButtonGroup();
group.add(choice1);
group.add(choice2);
group.add(choice3);
// A simple ActionListener, showing each selection using the ButtonModel
class VoteActionListener implements ActionListener {
public void actionPerformed(ActionEvent ev) {
String choice = group.getSelection().getActionCommand();
System.out.println("ACTION Choice Selected: " + choice);
}
}
// A simple ItemListener, showing each selection and deselection
class VoteItemListener implements ItemListener {
public void itemStateChanged(ItemEvent ev) {
boolean selected = (ev.getStateChange() == ItemEvent.SELECTED);
AbstractButton button = (AbstractButton) ev.getItemSelectable();
System.out.println("ITEM Choice Selected: " + selected
+ ", Selection: " + button.getActionCommand());
}
}
// Add listeners to each button
ActionListener alisten = new VoteActionListener();
choice1.addActionListener(alisten);
choice2.addActionListener(alisten);
choice3.addActionListener(alisten);
ItemListener ilisten = new VoteItemListener();
choice1.addItemListener(ilisten);
choice2.addItemListener(ilisten);
choice3.addItemListener(ilisten);
// Throw everything together
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container c = frame.getContentPane();
c.setLayout(new GridLayout(0, 1));
c.add(new JLabel("Vote for your favorite prelude & fugue cycle"));
c.add(choice1);
c.add(choice2);
c.add(choice3);
frame.pack();
frame.setVisible(true);
}
}
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