/** * Store details of club memberships. *  * @author (your name)  * @version (a version number or a date) */public class Club{    // Define any necessary fields here ...        /**     * Constructor for objects of class Club     */    public Club()    {        // Initialise any fields here ...            }    /**     * Add a new member to the club's list of members.     * @param member The member object to be added.     */    public void join(Membership member)    {    }    /**     * @return The number of members (Membership objects) in     *         the club.     */    public int numberOfMembers()    {        return 0;    }}