Lessons 1 and 2 - Creating super/sub clases and writing constructors

• Start with pet demo
• Use the car_demo

Lessons 3 and 4- overwriting and the super keyword

• Continue pet_demo
• Start question package

Lesson 5 - Creating references using inheritance hierarchy

• Finish question package

Lesson 6 - Polymorphism

Lesson 7 - The Object super class