/*
- * Copyright (C) 2016, 2017 Roland Häder
+ * Copyright (C) 2016 - 2020 Free Software Foundation
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* <p>
* @author Roland Häder<roland@mxchange.org>
*/
-public interface ShareableAddressbook extends Serializable {
+public interface ShareableAddressbook extends Comparable<ShareableAddressbook>, Serializable {
/**
* Getter for shared address book instance