Java Tutorial/Swing/ButtonGroup

Finding the selected button in a ButtonGroup

   <source lang="java">

import java.awt.BorderLayout; import java.awt.GridLayout; import java.util.Enumeration; import javax.swing.AbstractButton; import javax.swing.BorderFactory; import javax.swing.ButtonGroup; import javax.swing.JCheckBox; import javax.swing.JCheckBoxMenuItem; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JRadioButton; import javax.swing.JRadioButtonMenuItem; import javax.swing.JToggleButton; import javax.swing.border.Border; public class FindingAButtonGroup {

 public static void main(String args[]) {
   JFrame frame = new JFrame("Button Group");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JPanel panel = new JPanel(new GridLayout(0, 1));
   Border border = BorderFactory.createTitledBorder("Examples");
   panel.setBorder(border);
   ButtonGroup group = new ButtonGroup();
   AbstractButton abstract1 = new JToggleButton("Toggle Button");
   panel.add(abstract1);
   group.add(abstract1);
   AbstractButton abstract2 = new JRadioButton("Radio Button");
   panel.add(abstract2);
   group.add(abstract2);
   AbstractButton abstract3 = new JCheckBox("Check Box");
   panel.add(abstract3);
   group.add(abstract3);
   AbstractButton abstract4 = new JRadioButtonMenuItem("Radio Button Menu Item");
   panel.add(abstract4);
   group.add(abstract4);
   AbstractButton abstract5 = new JCheckBoxMenuItem("Check Box Menu Item");
   panel.add(abstract5);
   group.add(abstract5);
   frame.add(panel, BorderLayout.CENTER);
   frame.setSize(300, 200);
   frame.setVisible(true);
   group.setSelected(abstract1.getModel(), true);
   Enumeration elements = group.getElements();
   while (elements.hasMoreElements()) {
     AbstractButton button = (AbstractButton)elements.nextElement();
     if (button.isSelected()) {
       System.out.println("The winner is: " + button.getText());
     }
   }
 }

}</source>

Setting selected button in a button group

   <source lang="java">

import java.awt.BorderLayout; import java.awt.GridLayout; import java.util.Enumeration; import javax.swing.AbstractButton; import javax.swing.BorderFactory; import javax.swing.ButtonGroup; import javax.swing.JCheckBox; import javax.swing.JCheckBoxMenuItem; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JRadioButton; import javax.swing.JRadioButtonMenuItem; import javax.swing.JToggleButton; import javax.swing.border.Border; public class SettingSelectedAButtonGroup {

 public static void main(String args[]) {
   JFrame frame = new JFrame("Button Group");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JPanel panel = new JPanel(new GridLayout(0, 1));
   Border border = BorderFactory.createTitledBorder("Examples");
   panel.setBorder(border);
   ButtonGroup group = new ButtonGroup();
   AbstractButton abstract1 = new JToggleButton("Toggle Button");
   panel.add(abstract1);
   group.add(abstract1);
   
   AbstractButton abstract2 = new JRadioButton("Radio Button");
   panel.add(abstract2);
   group.add(abstract2);
   
   AbstractButton abstract3 = new JCheckBox("Check Box");
   panel.add(abstract3);
   group.add(abstract3);
   
   AbstractButton abstract4 = new JRadioButtonMenuItem("Radio Button Menu Item");
   panel.add(abstract4);
   group.add(abstract4);
   
   AbstractButton abstract5 = new JCheckBoxMenuItem("Check Box Menu Item");
   panel.add(abstract5);
   group.add(abstract5);
   frame.add(panel, BorderLayout.CENTER);
   frame.setSize(300, 200);
   frame.setVisible(true);
   group.setSelected(abstract1.getModel(), true);
   
   Enumeration elements = group.getElements();
   while (elements.hasMoreElements()) {
     AbstractButton button = (AbstractButton)elements.nextElement();
     if (button.isSelected()) {
       System.out.println("The winner is: " + button.getText());
     }
   }
 }

}</source>

Using ButtonGroup to group buttons

   <source lang="java">

import java.awt.BorderLayout; import java.awt.GridLayout; import javax.swing.AbstractButton; import javax.swing.BorderFactory; import javax.swing.ButtonGroup; import javax.swing.JCheckBox; import javax.swing.JCheckBoxMenuItem; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JRadioButton; import javax.swing.JRadioButtonMenuItem; import javax.swing.JToggleButton; import javax.swing.border.Border; public class AButtonGroup {

 public static void main(String args[]) {
   JFrame frame = new JFrame("Button Group");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JPanel panel = new JPanel(new GridLayout(0, 1));
   Border border = BorderFactory.createTitledBorder("Examples");
   panel.setBorder(border);
   ButtonGroup group = new ButtonGroup();
   AbstractButton abstract1 = new JToggleButton("Toggle Button");
   panel.add(abstract1);
   group.add(abstract1);
   AbstractButton abstract2 = new JRadioButton("Radio Button");
   panel.add(abstract2);
   group.add(abstract2);
   AbstractButton abstract3 = new JCheckBox("Check Box");
   panel.add(abstract3);
   group.add(abstract3);
   AbstractButton abstract4 = new JRadioButtonMenuItem("Radio Button Menu Item");
   panel.add(abstract4);
   group.add(abstract4);
   AbstractButton abstract5 = new JCheckBoxMenuItem("Check Box Menu Item");
   panel.add(abstract5);
   group.add(abstract5);
   frame.add(panel, BorderLayout.CENTER);
   frame.setSize(300, 200);
   frame.setVisible(true);
 }

}</source>