Chapter 9: Interfaces and Polymorphism

Announcement: Web Design Course

• CS 145 / ART 145 (Web Design) is now available in the Spring 2009 schedule of classes.

More on Inner Classes

• An inner class can access the instance fields from the outer class.
• An inner class can access local variables from surrounding blocks, provided that local variable is declared final.

JUnit and Package Review

• We will write some code to demonstrate the concepts from Friday, October 31.

Lecture Code

The following code shows how a unit test framework (JUnit) can be used to help test and debug the GringottsAccount class.

• TestProgram.java
• GringottsAccount.java