Solved

How do I make the time tick backwards?

Posted on 2001-06-25
6
223 Views
Last Modified: 2010-03-31
Hi guys,
I'm trying to create an applet that will display some kind of timer. Basically I need it to decrement the time every second, so it looks like a countdown of some sort. I have some code for the time to tick forward... but I have no idea how to make it tick backwards. Any help would be appreciated.

Here is what I have so far,

import java.awt.*;
import java.util.*;
import java.applet.*;

public class example extends Applet implements Runnable
{
    Date d;
    Thread runner;  
   
     public void init()
     {          
          setLayout(null);
          setSize(420,250);          
     }
     
     public void start()
     {
         if(runner == null)
         {
             runner = new Thread(this);
             runner.start();
         }
     }
     
     public void stop()
     {
         if(runner != null)
         {
             runner.stop();
             runner = null;
         }
     }
     
     public void run()
     {        
         while(true)
         {
             d = new Date();      
             repaint();
             try
             {
                 runner.sleep(1000);
             }
             catch(InterruptedException e)
             {
                 System.out.println(e);
             }
         }
     }
     
     public void paint(Graphics g)
     {
         g.drawString(d.toString() , 5, 100);        
     }
}
0
Comment
Question by:tixnmix
  • 3
  • 2
6 Comments
 
LVL 92

Expert Comment

by:objects
ID: 6223700
Replace your run() method with the following:


    public void run()
    {
        Date start = new Date();        
        while(true)
        {
            d.setTime(new Date().getTime() - start.getTime());      
            repaint();
            try
            {
                runner.sleep(1000);
            }
            catch(InterruptedException e)
            {
                System.out.println(e);
            }
        }

Let me know if u have any problems :)

0
 

Author Comment

by:tixnmix
ID: 6223815
Thanks for the reply, but I cant seem to get it to work though. =(
nothing is showing up on the applet...
0
 
LVL 92

Accepted Solution

by:
objects earned 150 total points
ID: 6223877
woops, two changes required:

1. Initialise d at the start (line 7(ish))

d = new Date();

2. Change the setTime call to:

d.setTime(start.getTime() - (new Date().getTime() - start.getTime()));

See how that goes.
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 

Author Comment

by:tixnmix
ID: 6223907
Ah !! Thanks a lot, that did it. =)
0
 
LVL 92

Expert Comment

by:objects
ID: 6223926
No worries.
Thanks for the points :)
0
 
LVL 4

Expert Comment

by:kylar
ID: 6224632
That's a good hack. I think that there should be some kind of reverse flag that allows you to create a Timer (for example) and have it tick in reverse. Objects, you've given me some food for thought. (And it's too early on monday for that)

Kylar

"Time keeps on tickin', tickin', tickin', into the future..."
    -Steve Miller, 'Fly Like an Eagle'
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Java 1603 Error 3 50
what is a "java.lang.System Property"   ? 20 57
Cipher Configuration on Apache HTTPD 4 53
eclipse argument 14 53
Java Flight Recorder and Java Mission Control together create a complete tool chain to continuously collect low level and detailed runtime information enabling after-the-fact incident analysis. Java Flight Recorder is a profiling and event collectio…
Go is an acronym of golang, is a programming language developed Google in 2007. Go is a new language that is mostly in the C family, with significant input from Pascal/Modula/Oberon family. Hence Go arisen as low-level language with fast compilation…
Video by: Michael
Viewers learn about how to reduce the potential repetitiveness of coding in main by developing methods to perform specific tasks for their program. Additionally, objects are introduced for the purpose of learning how to call methods in Java. Define …
Viewers will learn how to properly install Eclipse with the necessary JDK, and will take a look at an introductory Java program. Download Eclipse installation zip file: Extract files from zip file: Download and install JDK 8: Open Eclipse and …

863 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

22 Experts available now in Live!

Get 1:1 Help Now