Method pollFirst

src/main/java/org/mapdb/BTreeMapJava.java:439–447

()

        public E last() { return m.lastKey(); }

        @Override
        public E pollFirst() {
            while(true){
                E e = m.firstKey2();
                if(e==null || m.remove(e)!=null){
                    return e;
                }
            }
        }

        @Override
        public E pollLast() {