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Fall 2004 Exam 2 Review Page


Changed/Update mechanism



In the third Clock user interface, a Clock instance forms the model and a ClockText instance forms a view. Describe the sequence of messages that occur when a second of time passes by, such that the Clock is updated and the updated time is displayed by the ClockText. Hints: Think about self changed:, nextSecond, update:, and dependents.

Put your answers/comment/questions at Fall 04 Midterm 2 Review: Changed/Update mechanism


Draw a Class Diagram of a Student Registration System


You have just completed an analysis of a student registration system:


Draw a class diagram for these classes.

Put your answers/comments/questions at Fall 04 Midterm 2 Review: Class Diagram



User Interface



  1. What are some things to consider when developing a UI for K-12?
  2. What are some things to consider when developing a UI for senior citizens?
  3. What are ways to test your user interface? Both before the users are involved and after?
  4. What is a cognitive walkthrough and when is it useful?
  5. What is wrong with the UI for the clock on page 187?
  6. What is a process that you could follow for developing a good user interface?


Put your answers/comments/questions at Fall 04 Midterm 2 Review: User Interface



Design Critique



What is wrong with the following and how do you fix it?

  1. We decided to have one shape class and have a type attribtue which can be "Circle", "Rectangle", "Triagle". We have to case on the type to figure out what to draw. Later we need to case on the type again to output the postscript.
  2. Boxes need to use a pen so we had Box inherit from Pen.
  3. We got lots of coding done because we were able to copy code to many different classes.
  4. We really only needed one "main" class and a couple of helper classes.
  5. We call the class that edits the image part of the slide "EditBackground".


Put your answers/comments/questions at Fall 04 Midterm Review: Design Critique



Designing the Segway Palm


Palm has just announced a new kind of handheld device designed specifically for attaching to the Segway Personal Transportation device The new SegPalm will feature a map with GPS (``Global Positioning System'') for finding your way around town, an MP3 player and FM radio, a cellphone, and a Zagat's guide to the restauraunts around town, as well as the traditional appointment book, to-do list, and phonebook functions.

Palm wants some of these features to interoperate. For example:

  1. Draw a UML class diagram for the interactions between Maps, Locations, the address book, and the Zagat's guide, including any additional objects you think are necessary. You must account for all of the functionality described in this problem, but you needn't add any other (e.g., you don't have to handle the address book user interface). You do need to show attributes and services that would be necessary to implement the given functionality. Describe briefly what each of your services would do.

  2. Identify one design pattern that would be useful in this problem. Explain how it would be useful, and identify specific classes that you would use in a design for this problem that would correspond to the design pattern participant objects.

  3. Palm is using Squeak to implement the SegPalm. Imagine that you have an ordered collection errands of Location objects that represent places to which you have to run errands. You have a Map gridMap on which all the Locations appear. You are to write workspace code:

    1. To tell gridMap to highlightFor each of these Locations, and

    2. To ask each of the errands locations for its streetname (assume given, returns a string with the name of the street). For each street containing more than one errand location, print to the Transcript a message announcing ``There is more than one errand on street: '' with the street name.


Post comments, discussion, answers at Fall 04 Midterm 2 Review: Segway Palm.



Tools for Space Scientists


You are going to be designing a suite of tools for space scientists. Your scientists are going to need to work with three kinds of documents:





a. Explain how one (your choice which one) Design Pattern would be useful in building this application. Draw a UML class diagram of the portion of your design where the design pattern would be useful. (Note: You are not drawing the whole class diagram, nor are you showing me the structure of the Design Pattern. Rather, you are showing me a few classes in your application whose design would be based on the Design Pattern you've selected.)

b. The Space Scientists think this object-oriented stuff is just silly. "Fortran was good enough for my advisor and for me and for my students," they say. "Why not just use that?" What are the advantages of object-oriented design and programming for this problem?

Post comments, discussion, answers at Fall 04 Midterm 2 Review: Tools for Space Scientists




Design Patterns


a. Factory Method and Abstract Factory design patterns are quite similar. How are they similar and how are they different?

b. How are the Adapter and Bridge patterns similar and different?

Post comments, discussion, answers at Fall 04 Midterm 2 Review: Design Patterns



Simulation Concepts


Give short answers to these questions regarding simulations:

Post comments, discussion, answers at Fall 04 Midterm 2 Review: Simulations


1. Object-Oriented Testing


Answer each of the following briefly:

(a) What do we define as a unit when we are doing unit testing of an O-O program?

(b) What impact does the encapsulation that is fundamental to object-oriented programming have on testing?

(c) How does use of the SUnit and Junit tools help deal with a problem you described in your answer to (a)?

(d) Suppose you are designing tests for a subclass S of a class C and the you have already tested C. Under what conditions do methods of C have to be retested in the context of S?

Post comments, discussion, answers at Fall 04 Midterm 2 Review: O-O Testing



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