Java by API/javax.swing/ButtonGroup
ButtonGroup: add(AbstractButton b)
<source lang="java">
import javax.swing.ButtonGroup; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JRadioButton; public class MainClass extends JPanel {
public MainClass() { JRadioButton radMarriedYes = new JRadioButton("Yes?", true); JRadioButton radMarriedNo = new JRadioButton("No?", false); JRadioButton radGolfYes = new JRadioButton("Yes?", false); JRadioButton radGolfNo = new JRadioButton("No?", true); ButtonGroup radioGroup1 = new ButtonGroup(); ButtonGroup radioGroup2 = new ButtonGroup(); setLayout(null); add(radMarriedYes); add(radMarriedNo); add(radGolfYes); add(radGolfNo); radioGroup1.add(radMarriedYes); radioGroup1.add(radMarriedNo); radioGroup2.add(radGolfYes); radioGroup2.add(radGolfNo); radMarriedYes.setBounds(30, 50, 50, 20); radMarriedNo.setBounds(30, 80, 50, 20); radGolfYes.setBounds(150, 50, 50, 20); radGolfNo.setBounds(150, 80, 50, 20); } public static void main(String[] args) { JFrame frame = new JFrame(); frame.getContentPane().add(new MainClass()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(200, 200); frame.setVisible(true); }
}
</source>
ButtonGroup: getSelection()
<source lang="java">
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 MainClass {
public static void main(String[] args) { JRadioButton dem = new JRadioButton("Bill", false); dem.setActionCommand("Bill"); JRadioButton rep = new JRadioButton("Bob", false); rep.setActionCommand("Bob"); JRadioButton ind = new JRadioButton("Ross", false); ind.setActionCommand("Ross"); final ButtonGroup group = new ButtonGroup(); group.add(dem); group.add(rep); group.add(ind); class VoteActionListener implements ActionListener { public void actionPerformed(ActionEvent ex) { String choice = group.getSelection().getActionCommand(); System.out.println("ACTION Candidate Selected: " + choice); } } class VoteItemListener implements ItemListener { public void itemStateChanged(ItemEvent ex) { String item = ((AbstractButton) ex.getItemSelectable()).getActionCommand(); boolean selected = (ex.getStateChange() == ItemEvent.SELECTED); System.out.println("ITEM Candidate Selected: " + selected + " Selection: " + item); } } ActionListener al = new VoteActionListener(); dem.addActionListener(al); rep.addActionListener(al); ind.addActionListener(al); ItemListener il = new VoteItemListener(); dem.addItemListener(il); rep.addItemListener(il); ind.addItemListener(il); JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container c = frame.getContentPane(); c.setLayout(new GridLayout(4, 1)); c.add(new JLabel("Please Cast Your Vote")); c.add(dem); c.add(rep); c.add(ind); frame.pack(); frame.setVisible(true); }
}
</source>
ButtonGroup: setSelected(ButtonModel m, boolean b)
<source lang="java">
import javax.swing.ButtonGroup; import javax.swing.ButtonModel; import javax.swing.JRadioButton; public class Main {
public static void main(String[] argv) throws Exception { JRadioButton radioButton = new JRadioButton(); ButtonGroup group = new ButtonGroup(); ButtonModel model = radioButton.getModel(); group.setSelected(model, true); }
}
</source>