Scheduled task using timer

I have a standalone application that is scheduled to run every 15
minutes. I'm using the Timer class for scheduling. When it starts
running, it checks a table to see if there's any task that is waiting
to be processed. It is possible that one of these tasks will run for
about 3 hours. Does it wait for this task to finish before it checks
again if there's another task to perform? Should I use
"scheduleAtFixedRate" instead of the "schedule" method so that it
checks for a task every 15 minutes regardless if there's a task
running? What I would like is for the application to check every 15
minutes and process any task that is waiting.

Thanks for any help.
Cesar

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