Variable checker? Java

Question

Is it possible to check if a variable has changed, so that Methode use then new variable? (But I don't mean a timer. I mean something that only run when the variable change.) Java

Thanks

Answer 1

A TimerTask would be my first idea, it only has to fire every second

Answer 2

You could restrict the acces to the variable making it private. Then you create a setter. Now the variable has to be changed through the setter and you know when it's updated.

Answer 3

Like you wanna check if the time changed?

Answer 4

But (how) can I use this for something like a clock? So that it auto refresh the methode of the clock.

Thanks for the answer.

Answer 5

Yes.

Answer 6

So, that the the clock print out every time when a second is over. Or is a timer the only way?