RadioButtons.java

// ui/RadioButtons.java
// (c)2016 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
// Using JRadioButtons
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import static onjava.SwingConsole.*;

public class RadioButtons extends JFrame {
  private JTextField t = new JTextField(15);
  private ButtonGroup g = new ButtonGroup();
  private JRadioButton
    rb1 = new JRadioButton("one", false),
    rb2 = new JRadioButton("two", false),
    rb3 = new JRadioButton("three", false);
  private ActionListener al = e ->
    t.setText("Radio button " +
      ((JRadioButton)e.getSource()).getText());
  public RadioButtons() {
    rb1.addActionListener(al);
    rb2.addActionListener(al);
    rb3.addActionListener(al);
    g.add(rb1); g.add(rb2); g.add(rb3);
    t.setEditable(false);
    setLayout(new FlowLayout());
    add(t);
    add(rb1);
    add(rb2);
    add(rb3);
  }
  public static void main(String[] args) {
    run(new RadioButtons(), 200, 125);
  }
}