Set inside a Set and powerset problem. Need help.

Question

I've done other posts about this but I figured I'd start a new thread since I changed it so much. I understand the idea of power sets but not how it needs to be a Set inside a set and also how to get this thing to run. If anyone could show me a power set generator or help me fix my code I'd really appreciate it.
Thanks in advance
public static <E> Set<Set <E>> generatePowerSet(Set<E> S){
          Set<E> newSet = new HashSet<E>();
          Set<E> temp = new HashSet<E>();
          if (S.isEmpty() || S.equals("")) {
               Set<E> emptySet = new HashSet<E>(S);
               return (Set<Set<E>>) emptySet;
          else {
               Iterator<E> iter = S.iterator();
               temp = S;
               while (iter.hasNext()) {
                    E obj = iter.next();
                    temp.remove(obj);
                    Set<E> P = new HashSet<E>(temp);
                    P.addAll(temp);
                    newSet.addAll(P);
                    return newSet;
          }

Answer 1

I have no idea what a "power set" is.
But, this line:
if (S.isEmpty() || S.equals("")) {should just be:
if (S.isEmpty()) {S is the input parameter, and is a Set. Therefore, S can never equal an empty string.
Did you see my reply to your previous thread?
http://forum.java.sun.com/thread.jspa?threadID=677353
It seems that you didn't, because you didn't respond to it, and because your current code has the same problem.