Running System Time In JFrame

Question

import javax.swing.*;
import java.awt.*;
public class SystemTime{
public static void main(String[] args) {
JFrame win = new JFrame("System Time");
Container contPane = win.getContentPane();
contPane.setBackground(Color.blue);
BorderLayout layM = new BorderLayout();
layM.setHgap(5);
layM.setVgap(5);
contPane.setLayout(layM);
JTextArea tA = new JTextArea(10, 28);
tA.setText(" The Current system time is:");
JScrollPane scrollP = new JScrollPane(tA);
scrollP.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); scrollP.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS); contPane.add(scrollP, BorderLayout.CENTER);
JLabel nLab = new JLabel("The Time is updated every 3 seconds");
nLab.setHorizontalAlignment(JLabel.CENTER);
nLab.setOpaque(true);
nLab.setBackground(Color.green);
contPane.add(nLab, BorderLayout.NORTH);
JLabel sLab = new JLabel("Use the scrollbar to go to the latest entry");
sLab.setHorizontalAlignment(JLabel.CENTER);
sLab.setOpaque(true);
sLab.setBackground(Color.green);
contPane.add(sLab, BorderLayout.SOUTH);
win.pack();
win.setVisible(true);
public class TimerTest {
public static void main(String[] args){
String s1;
TimeData t1;
for (int counter = 1; counter >= 5; counter++) {
t1 = new TimeData(System.currentTimeMillis());
s1 = t1.toTimeString();
System.out.println(s1);
if (counter != 5) Timer.pause(3);
// You don't want to wait at the
// end of last iteration
public class TimeData {
private long hours, minutes, seconds;
public TimeData(long millis) {
seconds = (millis/1000)%60;
minutes = (millis/(60*1000))%60;
hours = (millis/(60*60*1000))%24;
public String toTimeString() {
return (String.valueOf(hours) + ":" + String.valueOf(minutes) + ":" + String.valueOf(seconds));
public long getHours() { return hours; }
public long getMinutes() { return minutes; }
public long getSeconds() { return seconds; }
code}
All the code compile and run OK. I am trying to put the System Time in the JFrame and run as an infiniate loop.  I manged to use the for loop. I need to have the Time In the Jframe.
as in TimerTest application.  Timedata give the output in hours: minutes: seconds.
Please can you assist in solving this problem.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

Answer 1

is there a reason for the 'long-hand' approach
import javax.swing.*;
import java.awt.*;
class SystemTime{
  public static void main(String[] args){
    final java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("HH:mm:ss");
    final JFrame win = new JFrame(sdf.format(new java.util.Date()));
    win.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    win.setSize(200,100);
    win.setLocationRelativeTo(null);
    win.setVisible(true);
    new javax.swing.Timer(1000,new java.awt.event.ActionListener(){
      public void actionPerformed(java.awt.event.ActionEvent ae){
        win.setTitle(sdf.format(new java.util.Date()));
    }).start();
}