Compares this year-month to another year-month.
!(p)
The comparison is based first on the value of the year, then on the value of the month.
It is "consistent with equals", as defined by {@link Comparable}.
@param other the other year-month to compare to, not null
@return the comparator value, negative if less, positive if greater
Compares this year-month to another year-month. !(p) The comparison is based first on the value of the year, then on the value of the month. It is "consistent with equals", as defined by {@link Comparable}.
@param other the other year-month to compare to, not null @return the comparator value, negative if less, positive if greater