Object Oriented Design Week 4 Final Quiz Answer Coursera

Object Oriented Design

Week 4 Final Quiz Answer | Coursera

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About this Course

This course takes Java beginners to the next level by covering object-oriented analysis and design. You will discover how to create modular, flexible, and reusable software, by applying object-oriented design principles and guidelines. And, you will be able to communicate these designs in a visual notation known as Unified Modelling Language (UML). You will be challenged in the Capstone Project to apply your knowledge of object-oriented design by evolving and documenting the Java codebase for an Android application with corresponding UML documentation.

Module 4 Final Quiz

Question 1)

The first stage of the two-stage design process is design.

Hint: This stage has activities like creating CRC cards, talking with the customer about their requirements, and creating mockups.

Ans:

Question 2)

The second stage of the two-stage design process is design.

Hint: This is when you will define the structure of the code and start turning your mockups into classes.

Ans:

Question 3)

Which of these conceptual design techniques will help you analyze the problem space to

determine classes for your object-oriented software? Choose the two correct answers.

tradeoffs
requirements
CRC
mockups

Question 4)

During conceptual design, once the problem is mapped into components, what are the other two critical pieces of information that you must specify for these classes or components? Choose the two correct answers.

abstract data types
responsibilities
collaborators
methods

Question 5)

You are writing the CRC card for a Bear component. Choose the two responsibilities.

den
eat berries
hunger
camper

Question 6)

You are writing the CRC card for a Bear component. Choose the three collaborators.

bear
den
tree
computer
guitar

Question 7)

You create an object that represents a user, storing important information about them such as their preferences. What kind of object is this?

boundary
entity
client
control

Question 8)

You create an object that represents a dialog box. It creates buttons and text fields, etc, for the user to interact with, and it logs those interactions. What kind of object is this?

display
boundary
entity control
interaction

Question 9)

You create an object that compares values from two different sources. It then updates the smaller value to be equal to the larger one. What kind of object is this?

control
repository
update
entity

Question 10)

Which of these is an example of a quality tradeoff?

Limiting features knowing that they can be added later
Adding security knowing it will reduce speed
Not delivering key features so that deadlines can be met
Adding preferences that allow users to switch some features on and off

Question 11)

What is the term for reducing a class or object to its inputs and outputs in modelling?

pipe thinking
process thinking
filter thinking
black box thinking

Question 12)

Which one of these classes is in most need of being decomposed?

Order
Store
Student
Book

Question 13)

In order to provide good encapsulation, fill-in-the-blanks on this UML class diagram: (Replace the underscores _ from top to bottom with minus signs ("-") or plus signs ("+"); your answer will be a string of six + or - signs with no spaces)

Ans:

Question 14)

You are writing a simple soccer video game. Select the best example of proper abstraction:

Question 15)

Which design principle enables developers to follow the guideline D.R.Y. ("Don't Repeat

Yourself");

encapsulation
abstraction
generalization
decomposition

Question 16)

Which of these UML class diagrams shows an association relationship?

Question 17)

Which of these UML class diagrams depicts an aggregation ("has-a") relationship between the two classes?

Question 18)

Which of these UML class diagrams depicts a composition, or a strong "has-a" relationship?

Question 19)

Select the object pairing that has an association relationship:

Tree - Root
Hiker - Trail
Coffee - Water
Book - Page

Question 20)

Select the object pairing that has an aggregation relationship:

Book - Page
Car - Road
Pie - Crust
Stapler - Staple

Question 21)

Select the object pairing that has a composition relationship:

Book - Page
Tea - Sugar
Bear - Forest
Record Player-Record -

Question 22)

Choose the two answers that correctly complete the following sentence:

"We say that a class has low cohesion if..."

...its purpose is unclear.

...it tries to encapsulate too many unrelated responsibilities.

...it does not have all the necessary parts, i.e. it is incomplete.

...connects to many other classes.

Question 23)

Two classes are tightly coupled. What are some ways you might be able to tell? Choose the two correct answers.

They are very highly reliant on each other

Their interactions are limited and controlled

They can easily be swapped with different implementations of the same class

In order to understand one class, you need to open up the other to look at the implementation

Question 24)

How can you apply the principle of Separation of Concerns in object-oriented programming?

Separate objects or components according to their role in the software

Ensure classes are only concerned with their own data

Split developers into teams that each deal with different parts of the software

Separate data and actions (methods) into different classes

Question 25)

Which of these violates Liskov's Substitution Principle?

the superclass is too general
the subclass adds behaviour
subclasses specify the abstract methods of the superclass
an operation in the superclass is replaced by a different operation in the subclass

Question 26)

For which of these situations would you use a sequence diagram?

To show the relationship between classes
To show all of the different processes of your program.
To show the different modes that your program can be in.
To show the collaborative behaviour of objects in your program.

Question 27)

Choose the correct state diagram for a car which has a state called "HasGas:"

Question 28)

Which of these elements represents a termination in a UML State diagram?

Question 29)

What is the purpose of model checking?

To test for user-reported bugs
To check the software for errors before release
To verify that the technical implementation matches conceptual mockups
To verify that the conceptual model of your software matches the customer's requirements,

Question 30)

What is an abstract data type?

a data-centric class
a type of data defined by the developer rather than the language.
a data type that cannot be used directly but must be implemented as an interface
variables that are assigned a type (i.e. integer, double) but does not yet have a value assigned