Exam 3 Topics
CS141: Introduction to Programming, Fall 2011

General Comments and Recommendations

• The exam will cover Objects and Classes in Chapter 7 of the text.
  Note that the material is cumulative so you are still expected to remember the earlier material from exam 1 and exam 2.
• This exam should take you no more than an 1 hour. However, you will have 2 hours to complete it.
• The exam will be closed book.
• Electronic devices, of any kind, will not be allowed.
• It is strongly recommended that you:
  • Re-read the text
  • Do the self-check exercises in the chapter (answers are in the text)
  • Review the reading quizzes
  • Review the programming exercises.

Class and Object Terminology

You should know the following terms:

class object instance variable & method class variable and method (i.e. static) scope (of instance and class variables & methods) accessor and mutator methods (i.e. "setters" and "getters") constructor

toString method this reference (implicit reference) static overloading encapsulation public vs private object reference null reference

Programming Skills

• Know how to write a simple class with instance (or class) variables, constructors, accessors & mutators, a toString() method, e.g. see Basic Class & Object Problems in exercise.
• Know how to create and initialize an object of a specified type.
• Know how to pass an object as a parameter (pass by reference as opposed to pass by value).
• When/why would you choose to make a variable (or method) static?
• Can static methods access instance variables? Can instance methods access static variables?
• Know how to work with a list of Objects:
  • Write code to create and initialize an array or ArrayList of objects.
  • Write a loop to print out specific information (e.g. the value of an instance variable) stored in each object of the list.