cps work

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02. Second Assignment – The FacebookUser Class

We’re going to make a small change to the UserAccount class from the last

assignment by adding a new method:

public abstract void getPasswordHelp();

This method is abstract because different types of user accounts may provide different

types of help, such as providing a password hint that was entered by the user when the

account was created or initiating a process to reset the password. Next we will create a

subclass of UserAccount called FacebookUser. The FacebookUser class needs to have

the following fields and methods in addition to what is in UserAccount:

Fields: String passwordHint

ArrayList<FacebookUser> friends

Methods: void setPasswordHint(String hint)

void friend(FacebookUser newFriend)

void defriend(FacebookUser formerFriend)

ArrayList<FacebookUser> getFriends()

The friend method should add the FacebookUser argument to the friends ArrayList (if

that FacebookUser is already in the friends list, display an error message), and the

defriend method should remove the FacebookUser argument from that ArrayList (if that

FacebookUser is not in the friends list, display an error message). The getFriends

method should return a copy of this user’s friends – create a new ArrayList with the

same FacebookUsers in it as this user’s friends. Do not return the friends ArrayList

directly, since this violates the principle of encapsulation. The getPasswordHelp method

should display the passwordHint. The FacebookUser class should also implement the

Comparable interface. FacebookUsers should be sorted alphabetically by username,

ignoring capitalization. (Hint: notice that the toString method returns the username of

the UserAccount.) Finally, write a driver program that creates several FacebookUsers

and demonstrates the user of the setPasswordHint, friend, defriend, getFriends, and

getPasswordHelp methods. Also, put the FacebookUser objects into an ArrayList,

sort them (see the jar file for this topic for help on this), and print them out in sorted

order.

You will be graded according to the following rubric (each item is worth one point):

 The UserAccount class is abstract and has the requested fields and methods

 The only abstract method is the getPasswordHelp method

 The FacebookUser class extends UserAccount

Copyright © 2017, 2018 Sinclair Community College. All Rights Reserved.

 FacebookUser has a friends ArrayList and methods to add, remove, and display

the friends

 FacebookUser implements Comparable and sorts alphabetically on username,

ignoring capitalization

 FacebookUser has a passwordHint that can be set through a method and is

displayed by the getPasswordHelp method

 The driver program creates a list of FacebookUsers

 The driver program sorts and displays the lists of FacebookUsers

 The driver program exercises the setPasswordHint, friend, defriend, getFriends,

and getPasswordHelp methods

 The program compiles and runs and the program is clearly written and follows

standard coding conventions

 Note: If your program does not compile, you will receive a score of 0 on the entire assignment

 Note: If you program compiles but does not run, you will receive a score of 0 on the entire assignment

 Note: If your Eclipse project is not exported and uploaded to the eLearn drop box correctly, you will receive a score of 0 on the entire assignment

 Note: If you do not submit code that solves the problem for this particular assignment, you will not receive any points for the program’s compiling, the program’s running, or following standard coding conventions.