Class UnmodifiableCollection

lib/java/util/Collections.java:968–1048

    }

    private static class UnmodifiableCollection<E> implements Collection<E>,
            Serializable {
        private static final long serialVersionUID = 1820017752578914078L;

        final Collection<E> c;

        UnmodifiableCollection(Collection<E> collection) {
            c = collection;
        }

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

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

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

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

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

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

        public Iterator<E> iterator() {
            return new Iterator<E>() {
                Iterator<E> iterator = c.iterator();

                public boolean hasNext() {
                    return iterator.hasNext();
                }

                public E next() {
                    return iterator.next();
                }

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

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

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