takeIndex = 0;
    } finally {
      monitor.leave();
    }
  }

  /**
   * @throws UnsupportedOperationException {@inheritDoc}
   * @throws ClassCastException {@inheritDoc}
   * @throws NullPointerException {@inheritDoc}
   * @throws IllegalArgumentException {@inheritDoc}
   */
  @CanIgnoreReturnValue
  @Override
  public int drainTo(Collection<? super E> c) {
    checkNotNull(c);

    /*
     * Improve the documentation of when InterruptedException is thrown. Our
     * behavior matches the JDK's, but the JDK's documentation is misleading.
     */
    /**
     * {@inheritDoc}
     *
     * <p>The default {@link AbstractFuture} implementation throws {@code InterruptedException} if
     * the current thread is interrupted before or during the call, even if the value is already
     * available.

      takeIndex = 0;
    } finally {
      monitor.leave();
    }
  }

  /**
   * @throws UnsupportedOperationException {@inheritDoc}
   * @throws ClassCastException {@inheritDoc}
   * @throws NullPointerException {@inheritDoc}
   * @throws IllegalArgumentException {@inheritDoc}
   */
  @CanIgnoreReturnValue
  @Override
  public int drainTo(Collection<? super E> c) {
    checkNotNull(c);

      return q.toString();
    } finally {
      monitor.leave();
    }
  }

  /**
   * @throws UnsupportedOperationException {@inheritDoc}
   * @throws ClassCastException {@inheritDoc}
   * @throws NullPointerException {@inheritDoc}
   * @throws IllegalArgumentException {@inheritDoc}
   */
  @CanIgnoreReturnValue // pushed down from class to method
  @Override
  public int drainTo(Collection<? super E> c) {

    /*
     * Improve the documentation of when InterruptedException is thrown. Our
     * behavior matches the JDK's, but the JDK's documentation is misleading.
     */
    /**
     * {@inheritDoc}
     *
     * <p>The default {@link AbstractFuture} implementation throws {@code InterruptedException} if
     * the current thread is interrupted before or during the call, even if the value is already
     * available.

      super.put(key, value);
      return this;
    }

    /**
     * {@inheritDoc}
     *
     * @since 11.0
     */
    @CanIgnoreReturnValue
    @Override
    public Builder<K, V> put(Entry<? extends K, ? extends V> entry) {
      super.put(entry);
      return this;
    }

    /**
     * {@inheritDoc}
     *
     * @since 19.0
     */
    @CanIgnoreReturnValue
    @Override

  int hashCode();

  /**
   * {@inheritDoc}
   *
   * <p>It is recommended, though not mandatory, that this method return the result of invoking
   * {@link #toString} on the {@link #entrySet}, yielding a result such as {@code [a x 3, c, d x 2,
   * e]}.
   */
  @Override
  String toString();

  // Refined Collection Methods

  /**
   * {@inheritDoc}
   *

  int hashCode();

  /**
   * {@inheritDoc}
   *
   * <p>It is recommended, though not mandatory, that this method return the result of invoking
   * {@link #toString} on the {@link #entrySet}, yielding a result such as {@code [a x 3, c, d x 2,
   * e]}.
   */
  @Override
  String toString();

  // Refined Collection Methods

  /**
   * {@inheritDoc}
   *

      super.put(key, value);
      return this;
    }

    /**
     * {@inheritDoc}
     *
     * @since 11.0
     */
    @CanIgnoreReturnValue
    @Override
    public Builder<K, V> put(Entry<? extends K, ? extends V> entry) {
      super.put(entry);
      return this;
    }

    /**
     * {@inheritDoc}
     *
     * @since 19.0
     */
    @CanIgnoreReturnValue
    @Override

  protected AbstractFuture() {}

  /**
   * {@inheritDoc}
   *
   * <p>The default {@link AbstractFuture} implementation throws {@code InterruptedException} if the
   * current thread is interrupted during the call, even if the value is already available.
   *
   * @throws CancellationException {@inheritDoc}
   */
  @CanIgnoreReturnValue
  @Override
  @ParametricNullness