return new Iterator()
return new Iterator<K>()
        public Iterator<K> iterator()        {          return new Iterator()          {	    /**	     * The iterator returned by <code>entrySet()</code>.	     */            private final Iterator<Map.Entry<K, V>> map_iterator	      = entrySet().iterator();	    /**	     * Returns true if a call to <code>next()</code> will	     * return another key.	     *	     * @return True if the iterator has not yet reached	     *         the last key.	     */            public boolean hasNext()            {              return map_iterator.hasNext();            }	    /**	     * Returns the key from the next entry retrieved	     * by the underlying <code>entrySet()</code> iterator.	     *	     * @return The next key.	     */            public K next()            {              return map_iterator.next().getKey();            }	    /**	     * Removes the map entry which has a key equal	     * to that returned by the last call to	     * <code>next()</code>.	     *	     * @throws UnsupportedOperationException if the	     *         map doesn't support removal.	     */            public void remove()            {              map_iterator.remove();            }          };        }