import java.awt.*;
import java.awt.event.*;
import com.sun.java.swing.JCheckBox;
import com.sun.java.swing.JPanel;
import com.sun.java.swing.JFrame;
import com.sun.java.swing.event.ChangeListener;
import com.sun.java.swing.event.ChangeEvent;

/**
 * An application that displays two JCheckBoxes. 
 */
public class CheckBoxDemo extends JPanel {
    static JFrame frame;
    static String first = new String("Button 1");
    static String second = new String("Button 2");

    public CheckBoxDemo() {
        // Create the buttons.
        JCheckBox firstButton = new JCheckBox(first);
        firstButton.setMnemonic('1'); 
        firstButton.setActionCommand(first);
        firstButton.setSelected(true);

        JCheckBox secondButton = new JCheckBox(second);
        secondButton.setMnemonic('2'); 
        secondButton.setActionCommand(second);

        // Register a listener for the check boxes.
        CheckBoxListener myListener = new CheckBoxListener();
        firstButton.addActionListener(myListener);
        firstButton.addChangeListener(myListener);
        firstButton.addItemListener(myListener);
        secondButton.addActionListener(myListener);
        secondButton.addChangeListener(myListener);
        secondButton.addItemListener(myListener);

        add(firstButton);
        add(secondButton);
    }


    /** Listens to the check boxes. */
    class CheckBoxListener implements ItemListener, //only event type needed
                                   ActionListener, //for curiosity only
                                   ChangeListener {  //for curiosity only
        public void itemStateChanged(ItemEvent e) {
            System.out.println("ItemEvent received: " 
                               + e.getItem()
                               + " is now "
                               + ((e.getStateChange() == ItemEvent.SELECTED)?
                                   "selected." : "unselected."));
        }

        public void actionPerformed(ActionEvent e) {
            String factoryName = null;

            System.out.print("ActionEvent received: ");
            if (e.getActionCommand() == first) {
                System.out.println(first + " pressed.");
            } else {
                System.out.println(second + " pressed.");
            }
        }

        public void stateChanged(ChangeEvent e) {
            System.out.println("ChangeEvent received from: "
                               + e.getSource());
        }
    }

    public static void main(String s[]) {
         WindowListener l = new WindowAdapter() {
             public void windowClosing(WindowEvent e) {System.exit(0);}
         };
 
         frame = new JFrame("CheckBoxDemo");
         frame.addWindowListener(l);
         frame.getContentPane().add("Center", new CheckBoxDemo());
         frame.pack();
         frame.setVisible(true);
    }
}