Want to use Timer class!!!

Question

I want to make a digital clock using Timer class of swing package to call method repaint() after every 1000 miliseconds which is capable to calling method actionPerformed of Interface ActionListener.
What changes need to do in my given code for that task?
import java.util.Calendar;
import java.awt.*;
import javax.swing.*;
public class DClock extends JFrame{
public DClock()
super("DIGITAL CLOCK");
getContentPane().setBackground(Color.WHITE);
setSize(300,150);
setVisible(true);
public void paint(Graphics g)
super.paint(g);
Calendar calendar = Calendar.getInstance();
int hour = calendar.get(Calendar.HOUR_OF_DAY);
int minute = calendar.get(Calendar.MINUTE);
int second = calendar.get(Calendar.SECOND);
g.setFont(new Font("Serif",Font.BOLD,36));
g.setColor(Color.BLUE);
g.drawString(hour + ":" + minute / 10 + minute % 10 +
":" + second / 10 + second % 10, 85, 60);
repaint();
public static void main(String[] args) {
DClock application=new DClock();
application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

Answer 1

dont know is any body see this but he is using
recursion. (i think) repaint tell the ui that is must
call the pain method. It's easy to find out if you're unsure. Just have a look.
    public void repaint() {
     repaint(0, 0, 0, width, height);
public void repaint(long tm, int x, int y, int width, int height) {
     if (this.peer instanceof LightweightPeer) {
         // Needs to be translated to parent coordinates since
         // a parent native container provides the actual repaint
         // services.  Additionally, the request is restricted to
         // the bounds of the component.
       if (parent != null) {
         int px = this.x + ((x < 0) ? 0 : x);
         int py = this.y + ((y < 0) ? 0 : y);
         int pwidth = (width > this.width) ? this.width : width;
         int pheight = (height > this.height) ? this.height : height;
         parent.repaint(tm, px, py, pwidth, pheight);
     } else {
         if (isVisible() && (this.peer != null) &&
          (width > 0) && (height > 0)) {
          PaintEvent e = new PaintEvent(this, PaintEvent.UPDATE,
                      new Rectangle(x, y, width, height));
          Toolkit.getEventQueue().postEvent(e);          
    }So no, it seems like it doesn't. It rather seems to call update.