Class Diagram for Facebook

In this lesson, we’ll identify and design the classes, abstract classes, and interfaces based on the requirements we previously gathered from the interviewer in our Facebook social network system.

Components of Facebook

As mentioned, we will design the Facebook social network using a bottom-up approach.

Person

The Person class contains details like name, address, phone number, and email derived from the User class.

User

The User class is Facebook’s main class and is responsible for various operations, such as sending messages or friend requests to other users, creating or joining groups or pages, and numerous others.

The class diagram of these two classes is provided below:

Note: The User class contains various methods representing user interactions and functionalities within the system. For brevity, only a subset of these methods is shown here.

Profile

The Profile class contains the personal information of a Facebook user, like their profile and cover pictures, their work and education details, and the list of places they’ve visited.

The visual representation of the Profile class is given below:

Work, education, and places

The Work, Education, and Places classes are used to provide relevant information and are involved in the Profile class.

The class representation of these classes is given below:

Page

The Page class represents a particular page that exists on the Facebook platform that will contain the name, description, likes count, and a particular ID to uniquely identify the page.

The UML representation of the class is shown below:

Group

The Group class represents a particular group that exists on the Facebook platform. This will contain the name, description, total users, and a particular ID to uniquely identify the group. In addition, it will have methods, using which, new users can be added to the group, and the group’s description can be updated.

The UML representation ...