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; } }