JAVA "to the power of"

Sup /prog/?

I know this is a retarded question, but I need some help with a method I need to write. The method parameters are a double and an int (a and b, respectively)

I need to write a for loop in the method that raises a (the double) to the power of b (the int)

How the fuck do I do this?? Normally this wouldn't be a problem, but I'm burnt out from finals

pubic static doubles powpowpow(double a, int b) {
 if(b<0)
  return 1/powpowpow(a,-b);
 else if(!b)
  return 1;
 else {
   // this is left as an exercise for the reader
 }
}