Class Diagram for Stack Overflow

Learn to create a class diagram for Stack Overflow using the bottom-up approach.

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

Components of Stack Overflow

As mentioned earlier, we will design the Stack Overflow system using a bottom-up approach.

Account

The Account class is used to identify a Stack Overflow user using their username, email, and id. Users with an account will have the option to create questions and add answers and comments to questions.

Here's what the class definition looks like:

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The class diagram of the Account class
The class diagram of the Account class

Guest

The Guest class is a user that can only search and view questions and their answers. The user needs to register an account to ask questions or answer them.

The visual representation of the Guest class is provided below:

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The class diagram of the Guest class
The class diagram of the Guest class

Question

The Question class is used to enter the details of the question being asked by a user, such as its title, content, tags, etc. It can also allow users to add comments and bounties.

Here is what the class definition looks like:

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The class diagram of the Question class
The class diagram of the Question class

Answer

The Answer class represents a user's answer to a question asked and will contain elements like the content, upvotes, downvotes, etc.

The UML representation of the class is shown below:

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The class diagram of the Answer class
The class diagram of the Answer class

Comment

The Comment class refers to an opinion or remark provided by a user on either a question or an answer. It can only be upvoted and ...

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