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Not sure what that means. When you can explain it and need more help, ask. Post your latest code when you do.

Edit: I updated my demo code. I realized that without a Swing component visible,...

I don't get that too often, unless you're standing on a ledge somewhere, contemplating stepping off.

If not (and I hope not), glad that I boosted you.

Here's a simple demo of what I was thinking you could do. Let me know if you have any questions.

Edit: Modified to actually show a JDialog to ensure that the javax.swing.Timer exists long enough...

I work. Weekends allow more time to consider the possiblities and respond; weekdays are limited to simpler, shorter problems. In this case, you haven't given us much to work with.

Try writing a...

Oh. That's fairly important info to include.

Correct me if I'm wrong: You want to display a JFrame for either a total amount of time set by the user or starting at a certain time and ending at a...

I don't see a JFrame and it's disappointing that the code you posted doesn't have a single comment. What's it supposed to do?