What is the correct way to iterate over a HashSet?

for (int i = 0; i < hashSet.size(); i++) {     System.out.println(hashSet.get(i)); } 

Iterator<String> it = hashSet.iterator(); while (it.hasNext()) {     System.out.println(it.next()); } 

for (String item : hashSet) {     System.out.println(item); }