Are static methods that don't use class variables safe?

[bengt hammarlund]

If I have a static method that only uses internal variables or variables that came as parameters on the function call, this function is thread safe?
I mean, these internal function values are stored in the calling thread's stack or other place?

Imagine this (useless) method:

public static int sum(long first, float second){
  int returnValue = (int) first;
  try{
    Thread.sleep();
  } catch (Exception ignore) {}
  returnValue+= (int) second;
  return returnValue;
}

and the calling thread's run() method:

 
public void run()...{
  fload a = 1.9f;
  long b = 10000009;
  int c = someClass.sum(b, a); // is this thread safe?
}

Thanks in advance for any reply!

[Stan James]

Yes, as long as you're not using any resources that might be shared by two threads - static member variables, other objects - you should be fine. I prefer not to talk about things like "stack space" but the idea that parameters and local variables in a method are in their own private space and scope is right & good.