Department of
Computer Science

CS 420/520 Object-Oriented Programming

CRN 44677 (for CS 420) and 44676 (for CS 520)

Course Description

Course Overview

Textbooks

Policies

Weekly Schedule

Getting a Computer Account

Academic Integrity Policy

PSU Student Code of Conduct

Class Mailing List

Pharo Resources

Winter Quarter 2012

Monday and Wednesday, 16:40–18:30 in Ondine 201

Instructor Andrew Black email: black telephone: 503 725 2411  Prof Black will hold office hours in FAB 115-10 Monday 11:30–noon and Thursday 10:00–11:50. It's also fine to just wander by his office and see if he's free, or send an email or telephone to set up an appointment at an alternative time.

TA Max OrHai email: Max.OrHai Max will hold office hours in the "fishbowl" (outsidde FAB 120) on Mon & Wed 15:30–16:30

Prerequisites

No familiarity with object-oriented programming is assumed; students who have expereince with Java or C++ should be prepared to unlearn some of what they think they know. Prior experience with Smalltalk is not required. The class assumes a working knowledge of discrete mathematics and machine organization — the fundamentals of instruction coding and data representation in the computer's memory. (Students who have completed PSU CS 310 and CS 340 will be well prepared)

Textbooks

Course Description

Topics covered will include responsibility-driven design, test-driven development, refactoring, code reading, reuse, parameterization, inheritance and programming patterns.

Specific Learning Objectives

On completion of this course, students should be able to

1. Design a group of collaborating objects to implement a given set of requirements;
2. Assign the responsibilities for the actions implied by the requirements to the appropriate objects;
3. Partition these responsibilities into appropriately named methods;
4. Write definitions for the classes that can be used to generate these objects;
5. Deduce the data necessary to implement the requirements, and partition that data among the objects
6. Define appropriate instance variables to store these data;
7. Create abstract superclasses in order to share common code,
8. Arrange the concrete and abstract classes in an appropriate hierarchy,
9. Write tests for methods
10. Explore existing classes and methods using the Smalltalk programming environment;
11. Read, write, edit, test, share and debug Smalltalk code using the development tools
12. Create packages and change sets containing their programs and export them from the Smalltalk system.

Policies

Attendance

I recommend that you come to class, that you participate actively, and that you take notes. The act of taking notes (even if you never look at them again) is a powerful learning aid. I will generally make any visual aids, code samples, etc. that I used in class available on the web, but these are not a substitute for being in class and taking notes. If you do have to miss a class, say because of illness or work-related travel, you are responsible for getting notes and finding out what went on in class from another student.

Reading Assignments

Reading listed in the syllabus for each week should be completed before coming to class. I may check on the completion of reading assignments by various means: oral or written quizzes in class, written summaries, discussion (web-based or in class), etc. Anything in a reading assignment is fair game for an exam question.

Programming Assignments

Print-outs of your assignment submissions are due at the start of class. On-line submissions are due before the start of class.

Regrading

I do sometimes make mistakes! If you believe that I have not graded your assignment according to the published grading scheme, please let me know in writing (email counts as writing!) within 1 week of the assignment being returned to you. Be specific as to why you think that my grading is inconsistent. I will then re-grade the whole assignment; the second grading will stand, whether it is higher or lower than the original grading.

Disabilities

If you are a student with a disability in need of academic accommodations, you should first register with the Disability Resource Center, and then notify the instructor to arrange for support services.

Makeup Exams

If you have a medical or a family emergency and must miss an exam, let me know, if at all possible before the exam, and I will work with you to find an alternative. Other reasons for absence such as scheduled travel are not emergencies and are not cause for a make-up.

Passing the Course

Every assignment in the course is connected to a learning objective. It is therefore important that you make an honest attempt to complete them all. A score of less than 30% on any assignment indicates that you have not met this condition, and is sufficient cause for failing the course. That means an F, at the discretion of the instructor.

Academic Integrity

Students are at university for two reasons: to learn stuff, and to gain a credential. Because the credential is important to many of our students, part of my role as a professor is to make sure that it has value. This means ensuring that the degree is awarded only to those students who have mastered the material in my course.

I have every sympathy for those who have difficulty with the material and seek the assistance of the instructor, the TA or their fellow students. I have no sympathy at all for those who decide that the fastest way to a degree is to cheat. I have been responsible for having cheating students dismissed from the university in the past, and I will not hesitate to seek to have cheaters dismissed in the future.

The most common form of academic dishonesty — cheating — is representing the work of others as your own. In all written material, it is expected that you will use others' work, but when you do so it must be in a way that makes it absolutely clear that someone else's work is being cited, and who is the original author. If you reproduce someone else's work in a way that makes it appear to be yours, you are guilty of plagiarism, in other words, of cheating.

Cheating on an assignment or exam will result in an automatic zero grade for that piece of work, and the initiation of disciplinary action at the University level.

Cheating and collaboration

I encourage collaboration on certain assignments; I will not tolerate cheating. Where is the line between these activities?

First, if an assignment is explicitly set up as a team assignment, you are of course allowed — indeed, required — to collaborate with the members of your team. In this case I will generally require only one completed piece of work to be turned in from the team as a whole.

For individual assignments, I encourage you to talk about the problem with your fellow students. During such discussion, you may even write something, perhaps the code of a critical method, as a group. If you do this, there is a danger that you might reproduce that group work as if it were your own. To guard against this danger, do the following: after the group session, destroy all the notes and code fragments that you may have brought away with you. Then go and do something else for an hour or two: go for a walk or a bike ride, play your favorite sport, go to the gym: do something to flush your short-term memory. Then sit down with a blank sheet of paper or a blank workspace and start work on your own solution. If you have a photographic memory or otherwise won't be able to forget what you have seen someone else write, then don't participate in collaborative problem-solving sessions.

If I see the same code or writing assignment from two or more students I will take this as evidence that these guidelines have been ignored, and will assign a grade of zero to all of the students involved.

Lecture material
(links will be activated as slides are available)

Also, sign up for the class mailing list using mailman.

Wed. 11^th Jan.

More on Smalltalk Syntax.

Joe the Box

Assignment 1

MLK Holiday — no class

Wed. 18^th Jan

Read PBE Chapters 3–4, 11

 Good code, and in-class demo.

Good Smalltalk, Part I

The KWIC-index problem

Testing.

Assignment 2

Simple Smalltalk testing: with Patterns.

Testing slides (pdf)

Trie slides (pdf)

Assignment 3

Deploying the State Pattern by Refactoring

Beck pp 43–78

Coding patterns for Methods

Best Practice Patterns II (slides)

Project Proposals assigned

Wed 15^th Feb

Programming GUIs

MorphicDemo-Dice is on SqueakSource

Assignment 5

Understanding Data Abstraction.

Pratt's Null Object Pattern,
Woolf's Null Object Pattern

Trampoline code in SqueakSource in package Collections-EnumerationEnhancements