OOP (course 3): Inheritance, Abstract Classes, Interfaces and other amazing things

Things are about to get crazy.

You've learned the basics (Course 1). Heck, you even mastered service objects, model objects and service containers in Course 2!

Now we're getting into the meat of OO:

• Class inheritance!
• What about abstract classes?
• Introducing the "protected" visibility
• What is an interface? How can I leverage them?

This stuff will start to separate you from a beginner OO developer to someone who can really understand and flex OO code. It's hard stuff. So let's get started.

• Extends
• Override
• Protected Visibility
• Calling Parent Class Methods
• Creating an Abstract Ship
• Abstract Classes
• Broken Ship
• Abstracting a Class into 2 Smaller Pieces
• AbstractShipStorage
• Interfaces