Method navigableKeySet

output/java_guava/1.4.18/Maps.java:4144–4148

()

    private transient NavigableSet<K> navigableKeySet;

    @Override
    public NavigableSet<K> navigableKeySet() {
      NavigableSet<K> result = navigableKeySet;
      return (result == null) ? navigableKeySet = new NavigableKeySet<K, V>(this) : result;
    }

    @Override
    public NavigableSet<K> descendingKeySet() {