Method add

src/main/java/org/mapdb/BTreeMapJava.java:524–530

(E k)

        }

        @Override
        public boolean add(E k) {
            if(hasValues)
                throw new UnsupportedOperationException();
            else
                return m.put(k, Boolean.TRUE ) == null;
        }

        @Override
        public void close() {