Question

During bug fixing in very old project I’ve faced with strange method, it looks like this:

   void waiter() {
        for (int i = 0; i < 20000; i++) ;
    }

Does it cause halting some time or it will be omitted by JVM optimization?

Answer 1

It will be optimized after few runs by JIT. The JVM , at the first run, needs to check if the value if i that is being incremented is not being used anywhere.

Check this article as well :

Java: how much time does an empty loop use?