Down Casting a Enumeration

Question

I tried the following code snippet.
import java.util.*;
class Strings implements Enumeration {
public boolean hasMoreElements() { return false;}
public Object nextElement() {return null;}
public class MainClass
public static void main(String args[])
Vector VectorObj = new Vector();
VectorObj.add("One");
VectorObj.add("Two");
VectorObj.add("Three");
Strings StringObj = (Strings) VectorObj.elements();
It compiles properly but i get the following run time exception:
java.lang.ClassCastException: java.util.Vector$1
what could be the problem? Do i need to do anything extra for the downcast?
TIA,
Babu

Answer 1

Had a look into the implementation of Vector.elements(). The inner class in elements() was causing the problem.
public Enumeration elements() {
return new Enumeration() {
int count = 0;
public boolean hasMoreElements() {
return count < elementCount;
public Object nextElement() {
synchronized (Vector.this) {
if (count < elementCount) {
return elementData[count++];
throw new NoSuchElementException("Vector Enumeration");
Thanks,
Babu