/**
 *
 */
private static final long serialVersionUID = 1L;
protected String passwordHint;
private ArrayList<FacebookUser> friends;

public FacebookUser() {
    super();

}

public FacebookUser(String username, String password) {
    super(username, password);
    friends = new ArrayList<>();

}

}

    public void friend(FacebookUser newFriend) {
        if (friends.contains(newFriend)) {
            System.out.println("nError, this person is already in your friends list");

        } else {
            friends.add(newFriend);
        }
    }

    public void defriend(FacebookUser formerFriend) {

        if (!friends.contains(formerFriend)) {
            System.out.println("Error, this person is not in your friends list");
        } else {
            friends.remove(formerFriend);
        }

    }

    public ArrayList<FacebookUser> getFriends() {

        // creating new array for friends copy
        ArrayList<FacebookUser> friendsListCopy = new ArrayList<>();

        try {

            for (FacebookUser friendsClone : this.friends) {

                friendsListCopy.add((FacebookUser) friendsClone.clone());

            }
        } catch (CloneNotSupportedException e) {

            return null;
        }

        for (int i = 0; i < friendsListCopy.size(); i++) {
            System.out.println(friendsListCopy.get(i));

        }

        return friendsListCopy;

    }

    @Override
    public void getPasswordHelp() {

        System.out.println("Password Hint: " + this.passwordHint);

    }

    @Override
    public int compareTo(FacebookUser o) {

        if (this.username.compareToIgnoreCase(o.username) != 0)
            return this.username.compareToIgnoreCase(o.username);

        return 0;
    }




}



package week03;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Scanner;

public class Facebook extends FacebookUser implements Serializable {

    /**
     *
     */
    private static final long serialVersionUID = 1L;
    Scanner input = new Scanner(System.in);
    private ArrayList<FacebookUser> users;

    public Facebook(String username, String password) {
        super(username, password);
        users = new ArrayList<>();

    }

    // prints users
    public void listUsers() {
        if( users.isEmpty())
        {
            System.out.println("List is empty");
        }
        else
        {
            for (FacebookUser users : this.users)

            {
            System.out.println("Username: " + users.getUsername());
            }
        }
    }


    // adds a user

    public void addUser() {

        //creating an instance of FacebookUser class
        FacebookUser user1 = new FacebookUser();

        System.out.println("Enter username to add: ");
        String newUser = input.nextLine();
        user1.setUsername(newUser);
    // using the setter method in UserAccount to set the username for "fb" object


        //if statement checks if any object contains the same username
        if (users.contains(user1)) {
            System.out.println("Error, username already exists");

        }
        else {

            System.out.println("Please enter password: ");
            String password = input.nextLine();
            System.out.println("Please enter password hint: ");
            String passwordHint = input.nextLine();

            FacebookUser user2 = new FacebookUser();
            //creating another object for the "official" new user

            user2.setPassword(password);
            user2.setUsername(newUser);
            user2.setPasswordHint(passwordHint);

            users.add(user2);

            System.out.println(newUser + " has been added");

        }
    }

    // deletes a user
    public void deleteUser() {

    FacebookUser user1= new FacebookUser();
    System.out.println("Enter username you want to remove: ");
    String removeUser = input.nextLine();


    user1.setUsername(removeUser);
    user1.setPassword(password);


        if (users.contains(user1)) {
            System.out.println("Enter password");
            String checkPassword = input.nextLine();

            if (user1.password.equals(checkPassword)) {
                users.remove(user1);
                System.out.println(removeUser + " has been removed");
            } else {
                System.out.println("Incorrect password");
            }
        } else {
            System.out.println("User does not exist");

        }
    }