Listing 14.1  Custom Date and Time Dialog Box using JDialog (TJDialog.java)
/*
 * <Applet code=TJDialog width=400 height=200>
 * </Applet>
 */

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

public class TJDialog extends JApplet implements ActionListener {
    // 1. Declare the underlying frame to which the
    //    dialog is attached.
    Frame frame = null;

    public void init() {
        // 2. Get a handle on the applet's content pane.
        Container container = this.getContentPane();

        // 3. Retrieve the underlying frame of the applet.
        // See snippet-5 for the details of getParentFrame().
        frame = getParentFrame(container);
	// 4. Add a button to bring up the dialog box.
        JButton button = new JButton("Show Date and Time");
        button.addActionListener(this);
        container.add(button, BorderLayout.SOUTH);
    }

    // 5. Retrieve the frame of the applet's container.
    public Frame getParentFrame(Component comp) {
        if (comp instanceof Frame) return (JFrame)comp;

        for (Component c = comp; c != null; c = c.getParent()) {
            // Check only for the Frame, not the JFrame!
            if (c instanceof Frame)
                return (Frame)c;
        }
	return null; // if there are no frames
    }

    // 6. Display the date and time for the current locale.
    public String showDateAndTime() {
        DateFormat dateAndTimeFormat =
                   DateFormat.getDateTimeInstance(
                       DateFormat.SHORT, DateFormat.LONG);
        String dateAndTime = dateAndTimeFormat.format(new Date());
        return dateAndTime;
    }

    // 7. When the button is displayed on the applet is operated…
    public void actionPerformed(ActionEvent ae) {
        String date_time = showDateAndTime();

        // When the applet's button is clicked, create the Swing
        // dialog box and display it.
        DateDialog dialog = new DateDialog(frame, date_time, true);
    }
}

// 8. Create a custom dialog box that extends JDialog
//    with a title and message.
class DateDialog extends JDialog implements ActionListener {
    Icon icon = new ImageIcon("clock.gif");

    public DateDialog(Frame frame, String msg, boolean modal) {
        // 9. Call the JDialog constructor.
        super(frame, "Date & Time Dialog" , modal);

        // 10. Set the background color of DateDialog.
        this.getContentPane().setBackground(Color.white);

        // 11. Create a confirmation button.
        JButton button = new JButton("OK");
        button.setPreferredSize(new Dimension(80, 25));
        button.addActionListener(this);

        // 12. Create a label to display the time and date.
        JLabel label = new JLabel(msg, icon, JLabel.CENTER);
        label.setFont(new Font("Dialog", Font.BOLD, 22));

        // 13. Add the message label and OK button to the dialog box.
        this.getContentPane().add(label, BorderLayout.CENTER);

        Box box = Box.createHorizontalBox();
        box.add(box.createHorizontalGlue());
        box.add(button);
        box.add(box.createHorizontalGlue());
        this.getContentPane().add(box, BorderLayout.SOUTH);

        // 14. Resize the dialog box and position it at the center of
        // the applet.
        setSize(300,150);
        Dimension dialogDim = getSize();
        Dimension frameDim = frame.getSize();
        Dimension screenSize = getToolkit().getScreenSize();
        Point location = frame.getLocation();
        location.translate(
            (frameDim.width-dialogDim.width)/2,
            (frameDim.height-dialogDim.height)/2);
        location.x = Math.max( 0, Math.min(location.x,
                             screenSize.width-getSize().width));
        location.y = Math.max(0, Math.min(location.y,
                             screenSize.height-getSize().height));

        setLocation(location.x, location.y);

        this.show();
    }

    // 15. When the OK button on the dialog box is clicked.
    public void actionPerformed(ActionEvent ae) {
        this.dispose();
    }
}

Listing 14.2   Date and Time Message Option Pane (TJOptionPane1.java)
/*
 * <Applet code=TJOptionPane1 width=400 height=75>
 * </Applet>
 */

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

public class TJOptionPane1 extends JApplet {
     Container container = null;

    public void init() {
        // 1. Get a handle on the applet's content pane.
        container = this.getContentPane();

        // 2. Add a box to the content pane.
        Box box = new Box(BoxLayout.X_AXIS);
        container.add(box);

        // 3. Create a button and add it to the box.
        JButton button = new JButton("Show Date and Time");
        button.setPreferredSize(new Dimension(200,25));
        button.addActionListener(new ButtonListener());
        box.add(Box.createGlue());
        box.add(button);
        box.add(Box.createGlue());
    }

    // 4. Listener class that displays a message dialog box.
    class ButtonListener implements ActionListener {
        String title = "Example Message Dialog";
        int messageType = JOptionPane.INFORMATION_MESSAGE;
        int optionType = JOptionPane.DEFAULT_OPTION;
        Object message = null;
        Object[] options = {ėThanksî};
        String dateAndTime = null;

        public void actionPerformed(ActionEvent e) {
            // 5. Obtain the date and time.
            dateAndTime = showDateAndTime();
            message = "The Time is " + dateAndTime;

            // 6. Create an option pane with specified attributes.
            JOptionPane pane = new JOptionPane(message,
                                               messageType,
                                               optionType,
                                               null,
                                               options);

            // 7. Create and show the dialog box to display the message.
            JDialog dialog = pane.createDialog(container, title);
            dialog.show();

            // 8. Reset the message to null.
            message = null;
        }

        // 9. Obtain the current date and time with the format
        // of the current locale.
        public String showDateAndTime() {
            DateFormat formatter = DateFormat.getDateTimeInstance(
                                           DateFormat.SHORT,
                                           DateFormat.LONG);

            String dateAndTime = formatter.format(new Date());
            return dateAndTime;
        }
    }
}

Listing 14.3  TJOptionPane2.java
/*
 * <Applet code=TJOptionPane2 width=400 height=75>
 * </Applet>
 */

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

public class TJOptionPane2 extends JApplet {
    Container container = null;

    public void init() {
        // 1. Get a handle on the applet's content pane.
        container = this.getContentPane();

        // 2. Add a box to the content pane.
        Box box = new Box(BoxLayout.X_AXIS);
        container.add(box);

        // 3. Add a button to the box.
        JButton button = new JButton("Show Time");
        button.setPreferredSize(new Dimension(150,25));
        button.addActionListener(new ButtonListener());
        box.add(Box.createGlue());
        box.add(button);
        box.add(Box.createGlue());
    }

    // 4. The listener class.
    class ButtonListener implements ActionListener {
        // 5. Argument values for the confirmation dialog box.
        Object confirmText = "Do You Wish To See Date Also?";
        String confirmTitle = "Date Confirmation Dialog";
        int optionType = JOptionPane.YES_NO_OPTION;
        int messageType1 = JOptionPane.QUESTION_MESSAGE;

        // 6. Argument values for the message dialog box.
        Object information = null;
        String title = "Message Display Dialog";
        int messageType2 = JOptionPane.INFORMATION_MESSAGE;


        // 7. Option selected.
        // If the selection is 'yes', selectedValue = 0;
        // If the selection is 'No', selectedValue = 1;
        int selectedValue;

        public void actionPerformed(ActionEvent e) {
            // 8. Display the confirmation dialog box.
            selectedValue = JOptionPane.showConfirmDialog(container,
                                 confirmText, confirmTitle,
                                 optionType, messageType1);

            // 9. Fetch the time or date and time.
            information = fetchInformation();

            // 10. Display the message.
            JOptionPane.showMessageDialog(container,
                                          information, title,
                                          messageType2);
        }

        // 11. Returns the time or date and time depending
        // on the Yes or No choice made.
        public String fetchInformation() {
            DateFormat formatter = null;

            if (selectedValue == 0) {  //If it is Yes.
                formatter = DateFormat.getDateTimeInstance(
                                       DateFormat.SHORT,
                                       DateFormat.LONG);
            }
            else if(selectedValue == 1) {  //If it is No.
                formatter = DateFormat.getTimeInstance(
                                           DateFormat.LONG);
            }

            // Format the time or date and time and return.
            return(formatter.format(new Date()));
        }
    }
}

Listing 14.4  TJOptionPane3.java
/*
 * <Applet code=TJOptionPane3 width=400 height=75>
 * </Applet>
 */

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

public class TJOptionPane3 extends JApplet {
    Container container = null;

    public void init() {
        // 1. Get a handle on the applet's content pane.
        container = this.getContentPane();

        // 2. Add a box to the content pane.
        Box box = new Box(BoxLayout.X_AXIS);
        container.add(box);

        // 3. Add a button to display the time.
        JButton button = new JButton("Click Me");
        button.setPreferredSize(new Dimension(150,25));
        button.addActionListener(new ButtonListener());
        box.add(Box.createGlue());
        box.add(button);
        box.add(Box.createGlue());
    }

    // 4. The button listener class.
    class ButtonListener implements ActionListener {
        // 5. Argument values for the option pane dialog box.
        String title1 = "Example Input Dialog";
        String message1 = "Make a Selection";
        int messageType1 = JOptionPane.QUESTION_MESSAGE;
      Icon icon = null;
        Object[] options = {"Date Only", "Time Only",
                            "Date and Time"};
        Object optionSelected = options[1];

        // 6. Selection status of check box.
        Object selectedValue;
        // This field stores the selection made in the check box
        // as a string when you press the 'ok' button. If you press
        // the 'cancel' button, the 'null' value is received.

        // 7. Argument values for the message dialog box.
        Object message2 = null;
        String title2 = "Example Message Dialog";
        int messageType2 = JOptionPane.INFORMATION_MESSAGE;

        public void actionPerformed(ActionEvent e) {
            // 8. Display the input dialog box to make a selection.
            selectedValue = JOptionPane.showInputDialog(
                                container, message1, title1,
                                messageType1,
                                null, options, options[1]);

            // 9. Get the date, time, or date and time.
            if (selectedValue != null) {  // i.e., if not 'cancel'
                message2 = getInformation();

                // 10. Finally, display the message dialog box.
                JOptionPane.showMessageDialog(container, message2,
                                              title2, messageType2);
            }
        }

        // 11. Method to retrieve the information.
        public String getInformation() {
            DateFormat formatter = null;

            if (selectedValue == "Time Only") {
                formatter = DateFormat.getTimeInstance(
                                DateFormat.SHORT);
            }
            else if (selectedValue == "Date Only") {
                formatter = DateFormat.getDateInstance(
                                DateFormat.SHORT);
            }

            else if (selectedValue == "Date and Time") {
                formatter = DateFormat.getDateTimeInstance(
                                DateFormat.SHORT,
                                DateFormat.SHORT);
            }

            // Now format the time or date and time and return.
            String information = formatter.format(new Date());
            return information;
        }
    }
}