Simple text clock

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));

        Container content = this.getContentPane();

        content.setLayout(new FlowLayout());

        content.add(timeField);

       

        this.setTitle("Text Clock");

        this.pack();

        // Create a 1-second timer and action listener for it.

        // Specify package because there are two Timer classes

        javax.swing.Timer t = new javax.swing.Timer(1000,

              new ActionListener() {

                  public void actionPerformed(ActionEvent e) {

                      Calendar now = Calendar.getInstance();

                      int h = now.get(Calendar.HOUR_OF_DAY);

                      int m = now.get(Calendar.MINUTE);

                      int s = now.get(Calendar.SECOND);

                      timeField.setText("" + h + ":" + m + ":" + s);

                  }

              });

        t.start();  // Start the timer

    }//end constructor

}//endclass TextClock.