UnmodifiableCollection(Collection<? extends E> c) 
{
            if (c==null)
                throw new NullPointerException();
            this.c = c;
}

 public boolean add(E e) 
{
            throw new UnsupportedOperationException();
}

 public boolean addAll(Collection<? extends E> coll) 
{
            throw new UnsupportedOperationException();
}

 public  void clear() 
{
            throw new UnsupportedOperationException();
}

 public boolean contains(Object o) 
{
return c.contains(o);
}

 public boolean containsAll(Collection<?> coll) 
{
            return c.containsAll(coll);
}

 public boolean isEmpty() 
{
return c.isEmpty();
}

 public Iterator<E> iterator() 
{
            return new Iterator< E >() {
                private final Iterator< ? extends E > i = c.iterator();
                public boolean hasNext() {return i.hasNext();}
                public E next()          {return i.next();}
                public void remove() {
                    throw new UnsupportedOperationException();
                }
            };
}

 public boolean remove(Object o) 
{
            throw new UnsupportedOperationException();
}

 public boolean removeAll(Collection<?> coll) 
{
            throw new UnsupportedOperationException();
}

 public boolean retainAll(Collection<?> coll) 
{
            throw new UnsupportedOperationException();
}

 public int size() 
{
return c.size();
}

 public Object[] toArray() 
{
return c.toArray();
}

 public T[] toArray(T[] a) 
{
return c.toArray(a);
}

 public String toString() 
{
return c.toString();
}