assertEquals("c", Iterables.getLast(list));
  }

  public void testGetLast_emptyList() {
    List<String> list = emptyList();
    assertThrows(NoSuchElementException.class, () -> Iterables.getLast(list));
  }

  public void testGetLast_sortedSet() {
    SortedSet<String> sortedSet = ImmutableSortedSet.of("b", "c", "a");
    assertEquals("c", Iterables.getLast(sortedSet));
  }

   * consider using {@code collection.getLast()} instead.
   *
   * @return the last element of {@code iterable}
   * @throws NoSuchElementException if the iterable is empty
   */
  @ParametricNullness
  public static <T extends @Nullable Object> T getLast(Iterable<T> iterable) {
    // TODO(kevinb): Support a concurrently modified collection?

     */
    public synchronized void store(final String sessionId, final boolean create) {
        CrawlingInfo crawlingInfo = create ? null : getCrawlingInfoService().getLast(sessionId);
        if (crawlingInfo == null) {
            crawlingInfo = new CrawlingInfo(sessionId);
            try {
                getCrawlingInfoService().store(crawlingInfo);

    assertEquals("foo", Iterators.getLast(iterator, "bar"));
  }

  public void testGetLast_withDefault_empty() {
    Iterator<String> iterator = emptyIterator();
    assertEquals("bar", Iterators.getLast(iterator, "bar"));
  }

  public void testGetLast_withDefault_empty_null() {
    Iterator<String> iterator = emptyIterator();
    assertThat(Iterators.<@Nullable String>getLast(iterator, null)).isNull();
  }

   * consider using {@code collection.getLast()} instead.
   *
   * @return the last element of {@code iterable}
   * @throws NoSuchElementException if the iterable is empty
   */
  @ParametricNullness
  public static <T extends @Nullable Object> T getLast(Iterable<T> iterable) {
    // TODO(kevinb): Support a concurrently modified collection?

// Java 21 Sequenced Collections support
SequencedCollection<String> sequenced = CollectionsUtil.newLinkedHashSet();
String first = CollectionsUtil.getFirst(sequenced);
String last = CollectionsUtil.getLast(sequenced);
SequencedCollection<String> reversed = CollectionsUtil.reversed(sequenced);

// Specialized collections
LruHashMap<String, Object> lruCache = new LruHashMap<>(100); // LRU cache with max 100 entries

   *
   * @throws NullPointerException if the last element is null; if this is a possibility, use {@link
   *     Iterables#getLast} instead.
   */
  @SuppressWarnings("nullness") // Unsafe, but we can't do much about it now.
  public final Optional<@NonNull E> last() {
    // Iterables#getLast was inlined here so we don't have to throw/catch a NSEE

    // TODO(kevinb): Support a concurrently modified collection?

   * @return the last element of {@code iterator}
   * @since 3.0
   */
  @ParametricNullness
  public static <T extends @Nullable Object> T getLast(
      Iterator<? extends T> iterator, @ParametricNullness T defaultValue) {
    return iterator.hasNext() ? getLast(iterator) : defaultValue;
  }

  /**
   * Calls {@code next()} on {@code iterator}, either {@code numberToAdvance} times or until {@code

    @Override
    public E getFirst() {
      synchronized (mutex) {
        return delegate().getFirst();
      }
    }

    @Override
    public E getLast() {
      synchronized (mutex) {
        return delegate().getLast();
      }
    }

    @Override
    public @Nullable E peekFirst() {
      synchronized (mutex) {
        return delegate().peekFirst();
      }
    }

    @Override
    public E getFirst() {
      synchronized (mutex) {
        return delegate().getFirst();
      }
    }

    @Override
    public E getLast() {
      synchronized (mutex) {
        return delegate().getLast();
      }
    }

    @Override
    public @Nullable E peekFirst() {
      synchronized (mutex) {
        return delegate().peekFirst();
      }
    }