public  void clear() 
{
            IdentityHashMap.this.clear();
}

 public boolean contains(Object o) 
{
            return containsKey(o);
}

 public int hashCode() 
{
            int result = 0;
            for (K key : this)
                result += System.identityHashCode(key);
            return result;
}

 public Iterator iterator() 
{
            return new KeyIterator();
}

 public boolean remove(Object o) 
{
            int oldSize = size;
            IdentityHashMap.this.remove(o);
            return size != oldSize;
}

 public boolean removeAll(Collection c) 
{
            boolean modified = false;
            for (Iterator< K > i = iterator(); i.hasNext(); ) {
                if (c.contains(i.next())) {
                    i.remove();
                    modified = true;
                }
            }
            return modified;
}

 public int size() 
{
            return size;
}