Method subSet

src/main/java/org/mapdb/BTreeMapJava.java:491–498

(E fromElement,
                                      boolean fromInclusive,
                                      E toElement,
                                      boolean toInclusive)

            return descendingSet().iterator();
        }
        @Override
        public NavigableSet<E> subSet(E fromElement,
                                      boolean fromInclusive,
                                      E toElement,
                                      boolean toInclusive) {
            return new KeySet<E>((ConcurrentNavigableMap2)m.subMap(fromElement, fromInclusive,
                    toElement,   toInclusive),hasValues);
        }
        @Override
        public NavigableSet<E> headSet(E toElement, boolean inclusive) {
            return new KeySet<E>((ConcurrentNavigableMap2)m.headMap(toElement, inclusive),hasValues);