Method subMap

src/main/java/org/mapdb/BTreeMapJava.java:964–972

(K fromKey,
                                  boolean fromInclusive,
                                  K toKey,
                                  boolean toInclusive)

        }

        @Override
        public SubMap<K,V> subMap(K fromKey,
                                  boolean fromInclusive,
                                  K toKey,
                                  boolean toInclusive) {
            if (fromKey == null || toKey == null)
                throw new NullPointerException();
            return newSubMap(fromKey, fromInclusive, toKey, toInclusive);
        }

        @Override
        public SubMap<K,V> headMap(K toKey,