Java: Example - Text Clock

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// TextClock.java -- Uses Timer, Calendar, JTextField.
//  -- Fred Swartz, 1999-05-01, 2001-11-02
//  Enhancements: center, leading zeros, uneditable, 12 hour, alarm, timer.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.util.Calendar;      // only need this one class

////////////////////////////////////////////////////////////////// TextClock
public class TextClock {
    //================================================================= main
    public static void main(String[] args) {
        JFrame clock = new TextClockWindow();
        clock.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        clock.setVisible(true);
    }//end main
}//endclass TextClock


//////////////////////////////////////////////////////////// TextClockWindow
class TextClockWindow extends JFrame {
    //=================================================== instance variables
    private JTextField timeField;  // set by timer listener

    //========================================================== constructor
    public TextClockWindow() {
        // Build the GUI - only one panel
        timeField = new JTextField(6);
        timeField.setFont(new Font("sansserif", Font.PLAIN, 48));

        Cont