Method headSet

corpus/java/training/guava/collect/Maps.java:3686–3689

(K toElement)

    }

    @Override
    public SortedSet<K> headSet(K toElement) {
      return new SortedKeySet<K, V>(map().headMap(toElement));
    }

    @Override
    public SortedSet<K> tailSet(K fromElement) {