}
    return 0;
  }

  @Override
  public boolean equals(@CheckForNull Object object) {
    if (object == this) {
      return true;
    }
    if (object instanceof CompoundOrdering) {
      CompoundOrdering<?> that = (CompoundOrdering<?>) object;
      return Arrays.equals(this.comparators, that.comparators);
    }
    return false;
  }

  @Override
  public int hashCode() {

    }
    return 0;
  }

  @Override
  public boolean equals(@CheckForNull Object object) {
    if (object == this) {
      return true;
    }
    if (object instanceof CompoundOrdering) {
      CompoundOrdering<?> that = (CompoundOrdering<?>) object;
      return Arrays.equals(this.comparators, that.comparators);
    }
    return false;
  }

  @Override
  public int hashCode() {

   * thenComparing} may be even more useful.
   */
  @GwtCompatible(serializable = true)
  public <U extends T> Ordering<U> compound(Comparator<? super U> secondaryComparator) {
    return new CompoundOrdering<>(this, checkNotNull(secondaryComparator));
  }

  /**
   * Returns an ordering which tries each given comparator in order until a non-zero result is