String str = it.next();
  System.out.println(str);
}
for迴圈遍歷：
for (String str : set) {
     System.out.println(str);
}
是不是簡單些?

優點還體現在泛型 假如 set中存放的是Object

Set<Object> set = newHashSet<Object>();
for迴圈遍歷：
for (Object obj: set) {
     if(obj instanceof Integer){
               int aa= (Integer)obj;
            }else if(obj instanceof String){
              String aa = (String)obj
            }
             ........
}