* 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

   * 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