SwingRadioButtons.java Source code

Introduction

Here is the source code for SwingRadioButtons.java

Source

// : c14:SwingRadioButtons.java
// Using JRadioButtons.
// <applet code=SwingRadioButtons width=200 height=100></applet>
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.ButtonGroup;
import javax.swing.JApplet;
import javax.swing.JFrame;
import javax.swing.JRadioButton;
import javax.swing.JTextField;

public class SwingRadioButtons extends JApplet {
    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 = new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            t.setText("Radio button " + ((JRadioButton) e.getSource()).getText());
        }
    };

    public void init() {
        rb1.addActionListener(al);
        rb2.addActionListener(al);
        rb3.addActionListener(al);
        g.add(rb1);
        g.add(rb2);
        g.add(rb3);
        t.setEditable(false);
        Container cp = getContentPane();
        cp.setLayout(new FlowLayout());
        cp.add(t);
        cp.add(rb1);
        cp.add(rb2);
        cp.add(rb3);
    }

    public static void main(String[] args) {
        run(new SwingRadioButtons(), 200, 100);
    }

    public static void run(JApplet applet, int width, int height) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(applet);
        frame.setSize(width, height);
        applet.init();
        applet.start();
        frame.setVisible(true);
    }
} ///:~