INF1B: Week 9: Abstract Classes and Interfaces

Week Highlights

By the end of this week, you should understand:

From Lecture 15: 

• what abstract classes and abstract methods are and when you might use them
• Why you cannot create an instantiation of an abstract method in the general case
• How to creating instantiations of abstract methods by extending them
• When you should use an abstract class and when a concrete class
• What interfaces are and when you would want to use them
• Why the Deadly Diamond of Death is not allowed in Java
• How to implement an interface
• Why Java allows a class to implement several interfaces but not to extend multiple abstract classes
• What the comparable interface is and when to use it

Lecture 15: Abstract Classes and Interfaces

• Slides: Lecture 15 Slides

Lecture 15 ➡ Objects First: read Chapter 12. Further Abstraction Techniques.

Tutorial: Assignment 2 Peer Evaluation

This tutorial is all about improving your work. You will be discussing and implementing feedback — both personal and general — on your submission for Assignment 2 Part 1. Then you will test your work on other students so that you can improve your work ready for the final Assignment 2 Part 2 submission.

Instructions: 

There are no sample solutions, because the tasks are individual.

Lab exercises

This week's lab exercises cover inheritance and enums. There are three core exercises.

What should I be doing with assessment?

Continue working on assignment 2 part 2.