Vector problem

Code:

---

Vector v1=new Vector();
v1.add("A");
Iterator k = v1.iterator();
while(k.hasNext())
        {
            String sreq=(String) k.next();
            Vector h=children(sreq);
            Iterator k1 = h.iterator();
            while(k1.hasNext())
            {
                String s2=(String) k1.next();
                v1.add(s2);
            }
        }

---

this code cause this error "java.util.concurrentmodificationexception"
so how could i fix this error?

From the API:

Quote:

---

The Iterators returned by Vector's iterator and listIterator methods are fail-fast: if the Vector is structurally modified at any time after the Iterator is created, in any way except through the Iterator's own remove or add methods, the Iterator will throw a ConcurrentModificationException. Thus, in the face of concurrent modification, the Iterator fails quickly and cleanly, rather than risking arbitrary, non-deterministic behavior at an undetermined time in the future. The Enumerations returned by Vector's elements method are not fail-fast.

---

Try using the add method of the Iterator. Or could you just use an ArrayList instead of a Vector?

many thanks i used ListIterator and it succeed