Three questions: 2 easy and 1 Broad :

1) how can you tell an object to run a method every five minutes. For example lets say i want program to spit out the square root of 16 to the console every five mintues. how could this be accomplished.
2) i have a problem with classpaths on Windows 2000. A lot of the programs I am experimenting with require me to set the classpath to the directory where the class's are located. This makes perfect sense to me, but what I end up doing is every time I open a dos prompt I have to set the classpath again. is there any way to set the class path permanently. Can I just set up the environment variables in the control panel? I thought this would work, butI don't see a classpath. I see two "path" variables though. One for user variables and one for system variables. Which should I use?
3) How do you have a program constantly run, so that it can listen for incoming variables. For example how does a web server stay running to monitor for http requests.

1) how can you tell an object to run a method every
five minutes. For example lets say i want program to
spit out the square root of 16 to the console every
five mintues. how could this be accomplished.use a Thread, make it sleep for 5 minutes
http://developer.java.sun.com/developer/technicalArticles/Threads/applet/index.html
2) i have a problem with classpaths on Windows 2000.
A lot of the programs I am experimenting with require
me to set the classpath to the directory where the
class's are located. This makes perfect sense to me,
but what I end up doing is every time I open a dos
prompt I have to set the classpath again. is there
any way to set the class path permanently. Can I
just set up the environment variables in the control
panel? I thought this would work, butI don't see a
classpath. I see two "path" variables though. One
for user variables and one for system variables.
Which should I use?the path variable is where the system looks when it want to run executables (java.exe, javac.exe)
the classpath variable is where java looks for unresolved classes
if you want all users on your system to have a classpath, put classpath in system
if only your login should have a classpath, put it in user
make sure you include '.' in your classpath to resolve the current directory
3) How do you have a program constantly run, so that
it can listen for incoming variables. For example how
does a web server stay running to monitor for http
requests.It just doesn't exitwhile (true) {
    get an http request
    process it...

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    Instead of that ,  define three windows for three clolumns and then define three text modules  that would be very easy. I have done the similar requirement for 2 columns.
    Reward points if useful.
    Regards,
    Nageswar

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