How to create timed events in java? Urgent for student project

Hi all, its my first post so forgive me if it doesn't follow the normal standards!
I'm doing a project which involves creating a game where things appear and disappear on the screen by calling up the relevant methods. Its one step away from being complete but the only problem is that I don't know how to make it so that all the appearing and disappearing happens automatically (via a timer that also terminates the game after 30 seconds of play).
For the moment, I've programmed it so that every time i click on a button, the relevant actions occur.
Please could someone help- I'd remember you forever! I've looked everywhere but i can't find anything.
xxx,
ruthless ruth!

thank you so much hunter9000 for that quick response. Only, I'm really dumb! I haven't been using Java for long and that thread is confusing for me.
I need a knight in shining armour to save my day by creating the variables and methods i need so that I can copy and paste it into my work. The timer needs to be called after clicking on the:
startGame(); button which then calls the doAnimation(); method
every 3 or 4 seconds which does all the things i need. It then needs to terminate stop the game after 30 seconds by calling:
endGame();
after which it resets itself and only redoes it once the user clicks on startGame() again.
PLEASE HELP!
xxx
Ruthless ruth.

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