Method contains

src/main/java/org/mapdb/BTreeMapJava.java:418–419

(Object o)

        @Override
        public boolean isEmpty() { return m.isEmpty(); }
        @Override
        public boolean contains(Object o) { return m.containsKey(o); }
        @Override
        public boolean remove(Object o) { return m.remove(o) != null; }
        @Override