A JRadioButton represents a radio button.
You can use multiple JRadioButtons to represents a selection from which only one item can be selected.
To indicate a logical grouping of radio buttons, you use a javax.swing.ButtonGroup object.
To programmatically select a JRadioButton, you pass true to its setSelected method.
public JRadioButton()
JRadioButton aRadioButton = new JRadioButton();
public JRadioButton(Icon icon)
JRadioButton aRadioButton = new JRadioButton(new DiamondIcon(Color.CYAN, false));
aRadioButton.setSelectedIcon(new DiamondIcon(Color.BLUE, true));
public JRadioButton(Icon icon, boolean selected)
JRadioButton aRadioButton = new JRadioButton(new DiamondIcon(Color.CYAN, false), true);
aRadioButton.setSelectedIcon(new DiamondIcon(Color.BLUE, true));
public JRadioButton(String text)
JRadioButton aRadioButton = new JRadioButton("4 slices");
public JRadioButton(String text, boolean selected)
JRadioButton aRadioButton = new JRadioButton("8 slices", true);
public JRadioButton(String text, Icon icon)
JRadioButton aRadioButton = new JRadioButton("12 slices", new DiamondIcon(Color.CYAN, false));
aRadioButton.setSelectedIcon(new DiamondIcon(Color.BLUE, true));
public JRadioButton(String text, Icon icon, boolean selected)
JRadioButton aRadioButton = new JRadioButton("16 slices", new DiamondIcon(Color.CYAN, false), true);
aRadioButton.setSelectedIcon(new DiamondIcon(Color.BLUE, true));
public JRadioButton(Action action)
Action action = ...;
JRadioButton aRadioButton = new JRadioButton(action);
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class MainClass {
public static void main(String[] a) {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new JRadioButtonDemo());
f.setSize(500, 500);
f.setVisible(true);
}
}
class JRadioButtonDemo extends JPanel implements ActionListener {
JTextField tf;
public void init() {
try {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
makeGUI();
}
});
} catch (Exception exc) {
System.out.println("Can't create because of " + exc);
}
}
private void makeGUI() {
setLayout(new FlowLayout());
JRadioButton b1 = new JRadioButton("A");
b1.addActionListener(this);
add(b1);
JRadioButton b2 = new JRadioButton("B");
b2.addActionListener(this);
add(b2);
JRadioButton b3 = new JRadioButton("C");
b3.addActionListener(this);
add(b3);
ButtonGroup bg = new ButtonGroup();
bg.add(b1);
bg.add(b2);
bg.add(b3);
tf = new JTextField(5);
add(tf);
}
public void actionPerformed(ActionEvent ae) {
tf.setText(ae.getActionCommand());
}
}