* Support for {@link ListIterator#set(Object)}; ignored for plain {@link Iterator}
   * implementations.
   */
  SUPPORTS_SET;

  /**
   * A set containing none of the optional features of the {@link Iterator} or {@link ListIterator}
   * interfaces.
   */
  public static final Set<IteratorFeature> UNMODIFIABLE = emptySet();

  /**
   * A set containing all of the optional features of the {@link Iterator} and {@link ListIterator}

    }
  }

  /**
   * Invokes {@code future.}{@link Future#get() get()} uninterruptibly.
   *
   * <p>Similar methods:
   *
   * <ul>
   *   <li>To retrieve a result from a {@code Future} that is already done, use {@link
   *       Futures#getDone Futures.getDone}.
   *   <li>To treat {@link InterruptedException} uniformly with other exceptions, use {@link
   *       Futures#getChecked(Future, Class) Futures.getChecked}.

   * be logged (using {@link java.util.logging.Logger}) and swallowed</i>.
   *
   * <p>Caches loaded by a {@link CacheLoader} will call {@link CacheLoader#reload} if the cache
   * currently contains a value for {@code key}, and {@link CacheLoader#load} otherwise. Loading is
   * asynchronous only if {@link CacheLoader#reload} was overridden with an asynchronous
   * implementation.
   *

 *
 * <ul>
 *   <li>{@link ImmutableDoubleArray}
 *   <li>{@link ImmutableIntArray}
 *   <li>{@link ImmutableLongArray}
 *   <li>{@link UnsignedInteger}
 *   <li>{@link UnsignedLong}
 * </ul>
 *
 * <h3>Per-type static utilities</h3>
 *
 * <ul>
 *   <li>{@link Booleans}
 *   <li>{@link Bytes}
 *       <ul>
 *         <li>{@link SignedBytes}
 *         <li>{@link UnsignedBytes}
 *       </ul>

        }
    }

    /**
     * Executes the statement.
     *
     * @param ps
     *            {@link PreparedStatement}. Must not be {@literal null}.
     * @return Whether the result is a {@link ResultSet}.
     * @throws SQLRuntimeException
     *             If a {@link SQLException} occurs.
     * @see PreparedStatement#execute()
     */

  }

  @Override
  @ParametricNullness
  public E element() {
    return delegate().element();
  }

  /**
   * A sensible definition of {@link #offer} in terms of {@link #add}. If you override {@link #add},
   * you may wish to override {@link #offer} to forward to this implementation.
   *
   * @since 7.0
   */
  protected boolean standardOffer(@ParametricNullness E e) {
    try {
      return add(e);

 * <p>There are deviations from this if there are failures or if {@link Service#stopAsync} is called
 * before the {@link Service} reaches the {@linkplain State#RUNNING RUNNING} state. The set of legal
 * transitions form a <a href="http://en.wikipedia.org/wiki/Directed_acyclic_graph">DAG</a>,
 * therefore every method of the listener will be called at most once. N.B. The {@link State#FAILED}

    * 您还可以关注<a href="https://x.com/fastapi" class="external-link" target="_blank">@fastapi on X (Twitter)</a>，这是个独立的账号
* <a href="https://www.linkedin.com/in/tiangolo/" class="external-link" target="_blank">在**领英**上联系我</a>
    * 接收我发布公告或新工具的消息（虽然我用 X (Twitter) 比较多）
* 阅读我在 <a href="https://dev.to/tiangolo" class="external-link" target="_blank">**Dev.to**</a> 或 <a href="https://medium.com/@tiangolo" class="external-link" target="_blank">**Medium**</a> 上的文章，或关注我

            cal.setTime(date);
            return cal;
        }
        return null;
    }

    /**
     * Converts to a {@link Calendar} with the local {@link TimeZone} and {@link Locale}.
     *
     * @param calendar
     *            {@link Calendar}
     * @return The converted {@link Calendar}
     */
    public static Calendar localize(final Calendar calendar) {
        assertArgumentNotNull("calendar", calendar);

  }

  @Override
  public int hashCode() {
    return delegate().hashCode();
  }

  /**
   * A sensible definition of {@link #removeAll} in terms of {@link #iterator} and {@link #remove}.
   * If you override {@code iterator} or {@code remove}, you may wish to override {@link #removeAll}
   * to forward to this implementation.
   *
   * @since 7.0 (this version overrides the {@code ForwardingCollection} version as of 12.0)