How do i create a timer?

Im currently working on a project.
I am require to make a timer which will start when the client clicks lets begin the game. How do i do this?? I currently have a empty disabled textfield but how do i display a timer that tells the user how long he has been playing the game for??

Wait, what do you mean by timer? If what you want is
something that says how much time has elapsed, then
create a field or local variable called, say,
"startTime" and store either a java.util.Date or the
current milliseconds value (like kajbj mentioned),
and then when you're done get the current time then
and then subtract.
If you want to wait for a period of time before
something happening, you can use Thread.sleep, or you
can use a java.util.Timer. Also apparently Swing has
a Timer mechanism, if you're using Swing.I read the original post as the OP wants to display a clock which shows for how long time the game has been playing / running.

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