Method headSet

src/main/java/org/mapdb/BTreeMapJava.java:499–502

(E toElement, boolean inclusive)

                    toElement,   toInclusive),hasValues);
        }
        @Override
        public NavigableSet<E> headSet(E toElement, boolean inclusive) {
            return new KeySet<E>((ConcurrentNavigableMap2)m.headMap(toElement, inclusive),hasValues);
        }
        @Override
        public NavigableSet<E> tailSet(E fromElement, boolean inclusive) {
            return new KeySet<E>((ConcurrentNavigableMap2)m.tailMap(fromElement, inclusive),hasValues);