k is initialised as 2 and increased by 1 each time the number is fed back concode_field_sep long sequenceNumber concode_elem_sep long lastFeedbacktime concode_elem_sep long k concode_field_sep void feedback concode_elem_sep long getSequenceNumber concode_elem_sep int hashCode concode_elem_sep boolean equals concode_elem_sep String toString concode_elem_sep int compareTo concode_elem_sep long getLastFeedbackTime