Programming Assignment 10

Due: Week of Nov. 14 in lab

Using inheritance, write a basic social network. Your network will resemble some elements of Facebook. There should be an Account super class. Two types will extend Account, Person and Page. There should be a Relationship super class. Two types will extend Relationship, Friend and Follow. You should also have a client program for the social network that defines the main.

Name the files Account.java, Person.java, Page.java, Relationship.java, Friend.java, Follow.java, and SocialNetwork.java.

Other details:

• Account - at a minimum
  • Should have at a minimum a name.
  • Should provide an accessor for the name variable.
  • Should override the toString function appropriately.
• Person - at a minimum
  • Should have an array of at most 100 Friend (note, that Java arrays can store null).
  • Should have an array of at most 10 Follow.
  • The constructor does NOT take an array of Friend or an array of Follow
  • A function addFriend(Person p) will create a Friend relationship between two people. Essentially it will call a helper function of this and p that searches for an empty (null) location in the friend array to insert a new Friend object. If no such location exists, report failure.
  • A function like(Page p) will search the following array for an empty location to insert a new Follow object. This function should also increment the number of followers (through a function) of p. If no location exists, report failure.
  • Should override the toString function appropriately. This function should call Account's toString function to increase code reuse (through super). Ensure that you output a list of friends and a list of follows (one line per friend/follow).
  • It is recommended to keep track of the number of friends and the number of followers as well. It might make error checking and implementation easier.
• Page - at a minimum
  • Should have an int for the number of followers.
  • The constructor does NOT take an integer for the number of followers. It should start at 0.
  • Should hava a function to increase the number of followers.
  • Should override the toString function appropriately. This function should call Account's toString function to increase code reuse. Ensure that you output the number of followers.
• Relationship - at a minimum
  • Should have a Date for the creation of the relationship (lookup java.util.Date).
  • Should override the toString function appropriately.
• Friend - at a minimum
  • Should contain a reference of a Person (recall a reference is a pointer). this means the Friend object points to an existing Person object. Do not use new when sending a Person in the constructor.
  • Should override the toString function appropriately. this function should call Relationship's toString function to increase code reuse. Only output the name of the Person instead of calling toString.
• Follow - at a minimum
  • Should contain a reference of a Page. This means the Follow object points to an existing Page object. Do not use new when sending a Page in the constructor. Also increment the number of follows on that page here.
  • Should override the toString function appropriately. this function should call Relationship's toString function to increase code reuse. Only output the name of the Page instead of calling toString.
• SocialNetwork - at a minimum
  • Should create two Person objects and one Page object. Have both people befriend each other and also follow the page.

Example output of SocialNetwork's test:
Person
Account name: Jory Denny
Number of friends: 1
Number of follows: 1
Friends
Friend. Relationship created Mon Nov 14 10:15:13 EST 2016. With Zachary Pollock.
Follows
Follow. Relationship created Mon Nov 14 10:15:13 EST 2016. Following Zen-Do-Kai Karate.

Person
Account name: Zachary Pollock
Number of friends: 1
Number of follows: 1
Friends
Friend. Relationship created Mon Nov 14 10:15:13 EST 2016. With Jory Denny.
Follows
Follow. Relationship created Mon Nov 14 10:15:13 EST 2016. Following Zen-Do-Kai Karate.

Page
Account name: Zen-Do-Kai Karate
Number of followers: 2

Bonus. Provide an example of polymorphism in your product, either with relationships or accounts. Other extensions: provide a feed and post mechanism for accounts using Strings.