ClockWithTimer

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package learning;

/**
 *
 * @author lantisse
 */

import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.Timer;


public class DigitalClock extends JFrame implements ActionListener {
JLabel timeLabel = new JLabel();
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
Timer timer;

public DigitalClock() {

super("Tes");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
timeLabel.setText(sdf.format(new Date(System.currentTimeMillis())));
timeLabel.setFont(new Font("Proxima Nova Alt", Font.PLAIN, 24));
timer = new Timer(500, this);
timer.setRepeats(true);
timer.start();
this.add(timeLabel);
this.pack();
this.setVisible(true);
        }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource().equals(timer)) {
// Then set a new time.
timeLabel.setText(sdf.format(new Date(System.currentTimeMillis())));
        }

    }

    public static void main(String[] args) {
// Create the digital clock.
new DigitalClock();

        }
}