Class SynchronizedSortedSet

lib/java/util/Collections.java:908–966

    }

    static class SynchronizedSortedSet<E> extends SynchronizedSet<E> implements
            SortedSet<E> {
        private static final long serialVersionUID = 8695801310862127406L;

        private final SortedSet<E> ss;

        SynchronizedSortedSet(SortedSet<E> set) {
            super(set);
            ss = set;
        }

        SynchronizedSortedSet(SortedSet<E> set, Object mutex) {
            super(set, mutex);
            ss = set;
        }

        public Comparator<? super E> comparator() {
            synchronized (mutex) {
                return ss.comparator();
            }
        }

        public E first() {
            synchronized (mutex) {
                return ss.first();
            }
        }

        public SortedSet<E> headSet(E end) {
            synchronized (mutex) {
                return new SynchronizedSortedSet<E>(ss.headSet(end), mutex);
            }
        }

        public E last() {
            synchronized (mutex) {
                return ss.last();
            }
        }

        public SortedSet<E> subSet(E start, E end) {
            synchronized (mutex) {
                return new SynchronizedSortedSet<E>(ss.subSet(start, end),
                        mutex);
            }
        }

        public SortedSet<E> tailSet(E start) {
            synchronized (mutex) {
                return new SynchronizedSortedSet<E>(ss.tailSet(start), mutex);
            }
        }

//        private void writeObject(ObjectOutputStream stream) throws IOException {
//            synchronized (mutex) {
//                stream.defaultWriteObject();
//            }
//        }