sheduling in java

[Dinesh Jayaraj]

how to support for sheduling in java
dear sir : iam doing project in which i have to support sheduling for ex u might have seen windows operating system supports sheduling,like u may see the clock in the taskbar of windows it will be running continuously, it will show the correct time when u boot the computer every time. In the similar fashion i have written an application for url validation i want to set the frequency of that application say 2 days(what ever) it should run automatically without user intervention once for the specified time frequency, u can assume that computer will be running continuously.
Is there any packages or third party tools which can be used to support such type of sheduling.
if anybody have written such type application please send the code for my reference. please help me iam in hurry.
humbly request
thanks a lot in advance
dinesh

[Carl Desborough]

you could have a thread that sleeps for a long time .. wakes up every so often and gets a new java.util.date (the current time) ... and compares it to the last time it ran the schduled service to see whether it should run another one