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As I mentioned in the first post of this series, you’re often going to hear about The Three Pillars of Object-Oriented Programming. You may also hear about The Four Pillars of Object-Oriented Programming.

And it’s not that there’s a total of seven or anything like that. Instead, it’s more about what people consider to be foundational to OOP: Are there three or four major concepts?

You can surmise from the previous article (let alone the title), I believe there are four.

And in this post, I’m going to cover the final two:

• Inheritance,
• and Polymorphism

If you’ve done any type of object-oriented programming prior to reading this article, you’ve likely heard of at least one of these.

Regardless, let’s take a look at each of them in more detail.

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When it comes to talking about object-oriented programming (or OOP), you’re likely to hear about The Three Pillars of Object-Oriented Programming or The Four Pillars of Object-Oriented Programming.

Depending on your background, you may have already heard of them, know what they are, and don’t really need to dive into it too much. But if you have not, I believe understanding them is foundational to object-oriented programming.

We’ve covered the whole Analysis phase of Object-Oriented Programming:

1. Analysis, Part 1
2. Analysis, Part 2
3. Understanding Customer Expectations
4. Statement of Work
5. Terms and Conditions

With that said, let’s get into the design and implementation discussions. After all, this is what’s many people want to jump to anyway, isn’t it?

Before writing any code, I’d like to do two posts about the four points of object-oriented programming (because I’m one of those who subscribes to the idea that there are four).

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