Lecture 4 Objectives

At the end of today's class you should

KNOW:

that an abstract class is a mechanism provided by Java to facilitate sharing of code and data
that abstract classes can't be instantiated
that a class can extend at most one other class (abstract or concrete)
that a class can implement any number of interfaces

BE ABLE TO:

design a class hierarchy for classes that have multiple properties

Sample Exam Question:

Suppose we want to create a category of animals that are four-legged (i.e. Dillos and Tigers). Suggest a way to modify the animal hierarchy we developed in class today to accomodate this addition.