1 Objects, Classes, Polymorphism, and Interfaces

4.1 In the video lecture for Interfaces : Section 6 we discussed an example program that implements an inheritance hierarchy (Mammal is the superclass of Cat and Dog; Insect is the superclass of Cricket). Which method or methods in that program are called polymorphically?

4.2 Write the Java code to declare a new class Bee which is a subclass of Insect. The noise made by a Bee is "Buzz".

4.3 Write the Java code to declare a new abstract class Amphibian that implements the MakesNoise interface.

4.4 Write the Java code to declare a new class Frog which is a subclass of Amphibian. The noise made by a Frog is "Ribbet".

4.5 Modify the run() method of Main and add some Bees and Frogs to critters. Build your program and verify that it works correctly. Include all of your .java source code files in the zip archive that you submit for grading.

2 GUI Programming

5.1 For these exercises, include your completed .java files in the zip archive that you submit for grading. Complete the code in the provided View class to implement this GUI interface for a calculator. The calculator does not have to be fully functional; the primary objective of the assignment is to implement the GUI.

5.2 Complete the code in actionPerformed() so when the Exit button is clicked, the application will terminate.

5.3 Complete the code in actionPerformed() so when the About button is clicked, the application will display this about dialog:

3 .

Nested Classes

6.1 Explain what an inner class is.

6.2 Explain how a local class differs from an inner class.

6.3 Explain how an anonymous class differs from an inner and local class.

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