buttoneventsdemo.java

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import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

/**
 * Demonstrates event-handling for radio buttons. This class extends
 * class {@link @JPanel}.
 *
 * @author author name
 * @version 1.0.0
 */
public class ButtonEventsDemo extends JPanel {

    private JRadioButton  buttonOne;
    private JRadioButton  buttonTwo;
    private JRadioButton  buttonThree;
    private JLabel  label;

    /**
     * Creates a window.
     *
     * @param args  not used.
     */
    public static void main(String[] args) {

        JFrame frame = new JFrame("ButtonEventsDemo");

        frame.setContentPane(new ButtonEventsDemo());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(200,200);
        frame.setVisible(true);
    }

    /**
     * Creates the components.
     */
    public ButtonEventsDemo() {

        setBackground(Color.white);

        // Creates the components
        buttonOne = new JRadioButton("One", true);
        buttonTwo = new JRadioButton("Two");
        buttonThree = new JRadioButton("Three");
        label = new JLabel(buttonOne.getText());
        label.setFont(new Font("Serif", Font.BOLD, 42));
        label.setHorizontalAlignment(JLabel.CENTER);

        // Group the radio buttons
        ButtonGroup group = new ButtonGroup();
        group.add(buttonOne);
        group.add(buttonTwo);
        group.add(buttonThree);

        // Change the buttons colors
        buttonOne.setBackground(Color.white);
        buttonTwo.setBackground(Color.white);
        buttonThree.setBackground(Color.white);

        // Register the listeners for the radio buttons.
        buttonOne.addActionListener(new ListenerOne());
        buttonTwo.addActionListener(new ListenerTwo());
        buttonThree.addActionListener(new ListenerThree());

        // Add the radio buttons to a panel
        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(3, 1));
        panel.add(buttonOne);
        panel.add(buttonTwo);
        panel.add(buttonThree);

        // Create the layout
        setLayout(new BorderLayout());
        add(panel, BorderLayout.WEST);
        add(label, BorderLayout.CENTER);
        panel.setBorder(BorderFactory.createEtchedBorder());
        label.setBorder(BorderFactory.createLoweredBevelBorder());
    }

    /**
     * This inner class handles events associated with radio
     * button "One".
     */
    class ListenerOne implements ActionListener {

        /**
         * Changes the text of the label.
         *
         * @param event  the event object.
         */
        public void actionPerformed(ActionEvent event) {

            label.setText(buttonOne.getText());
        }
    }

    /**
     * This inner class handles events associated with radio
     * button "Two".
     */
    class ListenerTwo implements ActionListener {

        /**
         * Changes the text of the label.
         *
         * @param event  the event object.
         */
        public void actionPerformed(ActionEvent event) {

            label.setText(buttonTwo.getText());
        }
    }

    /**
     * This inner class handles events associated with radio
     * button "Three".
     */
    class ListenerThree implements ActionListener {

        /**
         * Changes the text of the label.
         *
         * @param event  the event object.
         */
        public void actionPerformed(ActionEvent event) {

            label.setText(buttonThree.getText());
        }
    }
}