Returns the comparator used to order the keys in this map, or {@code null} if this map uses the {@linkplain Comparable natural ordering} of its keys.
@return the comparator used to order the keys in this map, or {@code null} if this map uses the natural ordering of its keys
See Implementation
Returns the comparator used to order the keys in this map, or {@code null} if this map uses the {@linkplain Comparable natural ordering} of its keys.
@return the comparator used to order the keys in this map, or {@code null} if this map uses the natural ordering of its keys