Question

I have a method and inside this method I have a block:

public void method()
{
   [block instructions]
}

But this method is called twice in my program. I would like this block to be executed only one time and only for the first occurrence of the method. What would be the best and elegant way to do that?

Answer 1

private static final AtomicBoolean hasRunAtom = new AtomicBoolean();

public void method() {
  if (hasRunAtom.getAndSet(true)) return;
  [block instructions]
}