Class Clock 

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.Container
                   |
                   +----java.awt.Panel
                           |
                           +----java.applet.Applet
                                   |
                                   +----Clock
public class Clock
extends Applet
implements Runnable
This extension to the Applet class tells you what time it is. The time is displayed in a 24 point Bold Arial font, and is updated every second (so the display may occasionally skip a beat). The applet is an example used in a presentation on Java programming.

Constructor Index

o Clock()

Method Index

o init()
Main entry point for our simple Applet.
o LeadingZero(int)
Utility routine to convert an int to a string, adding a leading zero if the value is less than ten.
o run()
The main thread of execution.
o start()
Called each time the browser displays the page.
o stop()
Called each time the browser leaves the page.
o update(Graphics)
Display update method.

Constructors

o Clock 
  public Clock()

Methods

o init 
  public void init()
Main entry point for our simple Applet. All we do is make ourself visible
Overrides:
init in class Applet
o start 
  public void start()
Called each time the browser displays the page. If we haven't got a running thread, then create one, and start the new thread running.
Overrides:
start in class Applet
o stop 
  public void stop()
Called each time the browser leaves the page. Stop and junk any thread that may be running.
Overrides:
stop in class Applet
o run 
  public void run()
The main thread of execution. While we have a running thread, update the display, sleep for the specified time and go round again.
o update 
  public void update(Graphics g)
Display update method. This applet overrides "update" (rather than providing a "paint" method) because we want to clear our background to a non-default colour. By doing this directly here, we avoid having our background cleared for us and so the clock display shouldn't flicker so much.
Parameters:
g - Graphics context we are to display the time in
Overrides:
update in class Component
o LeadingZero 
  public String LeadingZero(int value)
Utility routine to convert an int to a string, adding a leading zero if the value is less than ten. Note that the conversion from int to String is done by using the "+" operator to append the int to a constant string. This is the one time in Java where an operator appears to be overloaded. However, it is really just acting as a string concatenation operator - an implicit call to the toString() method is done on the int before the operation is performed.
Parameters:
value - The number to be converted
Returns:
String representation of the number