* there is no need to use this method.
   *
   * @param comparator the comparator that defines the order
   * @return comparator itself if it is already an {@code Ordering}; otherwise an ordering that
   *     wraps that comparator
   */
  @GwtCompatible(serializable = true)
  public static <T extends @Nullable Object> Ordering<T> from(Comparator<T> comparator) {
    return (comparator instanceof Ordering)
        ? (Ordering<T>) comparator

   * there is no need to use this method.
   *
   * @param comparator the comparator that defines the order
   * @return comparator itself if it is already an {@code Ordering}; otherwise an ordering that
   *     wraps that comparator
   */
  @GwtCompatible(serializable = true)
  public static <T extends @Nullable Object> Ordering<T> from(Comparator<T> comparator) {
    return (comparator instanceof Ordering)
        ? (Ordering<T>) comparator

  private final Comparator<? super C> columnComparator;

  private static class Factory<C, V> implements Supplier<Map<C, V>>, Serializable {
    final Comparator<? super C> comparator;

    Factory(Comparator<? super C> comparator) {
      this.comparator = comparator;
    }

    @Override
    public Map<C, V> get() {
      return new TreeMap<>(comparator);
    }

    assertEquals(multimap, copy);
  }

  private static final Comparator<Double> KEY_COMPARATOR = Ordering.natural();

  private static final Comparator<Double> VALUE_COMPARATOR =
      Ordering.<Double>natural().reverse().nullsFirst();

  /**
   * Test that creating one TreeMultimap from another does not copy the comparators from the source
   * TreeMultimap.
   */
  public void testCreateFromTreeMultimap() {

   * @since 11.0
   */
  @DoNotMock
  public static final class Builder<R, C, V> {
    private final List<Cell<R, C, V>> cells = Lists.newArrayList();
    @CheckForNull private Comparator<? super R> rowComparator;
    @CheckForNull private Comparator<? super C> columnComparator;

    /**
     * Creates a new builder. The returned builder is equivalent to the builder generated by {@link
     * ImmutableTable#builder}.
     */

      return toString;
    }
  }

  /**
   * Returns a {@code Comparator<Boolean>} that sorts {@code true} before {@code false}.
   *
   * <p>This is particularly useful in Java 8+ in combination with {@code Comparator.comparing},
   * e.g. {@code Comparator.comparing(Foo::hasBar, trueFirst())}.
   *
   * @since 21.0
   */
  public static Comparator<Boolean> trueFirst() {
    return BooleanComparator.TRUE_FIRST;
  }

  /**

      return toString;
    }
  }

  /**
   * Returns a {@code Comparator<Boolean>} that sorts {@code true} before {@code false}.
   *
   * <p>This is particularly useful in Java 8+ in combination with {@code Comparator.comparing},
   * e.g. {@code Comparator.comparing(Foo::hasBar, trueFirst())}.
   *
   * @since 21.0
   */
  public static Comparator<Boolean> trueFirst() {
    return BooleanComparator.TRUE_FIRST;
  }

  /**

  /**
   * Creates a {@code MonitorBasedPriorityBlockingQueue} with the specified initial capacity that
   * orders its elements according to the specified comparator.
   *
   * @param initialCapacity the initial capacity for this priority queue
   * @param comparator the comparator that will be used to order this priority queue. If {@code
   *     null}, the {@linkplain Comparable natural ordering} of the elements will be used.

    Comparator<Comparable<?>> comparator = Ordering.natural().reverse();
    SortedSet<String> set =
        new ImmutableSortedSet.Builder<String>(comparator).add("a", "b", "c").build();
    SortedSet<String> copy = SerializableTester.reserializeAndAssert(set);
    assertTrue(elementsEqual(set, copy));
    assertEquals(set.comparator(), copy.comparator());
  }

  public void testReverseOrder() {

    private final Comparator<? super E> comparator;

    public Builder(Comparator<? super E> comparator) {
      this.comparator = checkNotNull(comparator);
    }

    Builder(Comparator<? super E> comparator, int expectedSize) {
      super(expectedSize);
      this.comparator = checkNotNull(comparator);
    }

    @CanIgnoreReturnValue
    @Override
    public Builder<E> add(E element) {