Assuming that a comparator or compareTo method always returns -1 or 1 if the first operand is less than or greater than the second is
incorrect.
The specifications for both methods, Comparator.compare and Comparable.compareTo, state that their return value is "a
negative integer, zero, or a positive integer as this object is less than, equal to, or greater than the specified object." Even if a specific
comparator always returns -1, 0, or 1, this is only an implementation detail, not the API contract developers can rely on.
