Question 1

Which of the following is the most important consideration when designing a class?

Accepted Answer

A) Each class should represent an appropriate mathematical concept. 
B) Each class should represent a single concept or object from the problem domain. 
C) Each class should represent no more than three specific concepts. 
D) Each class should represent multiple concepts only if they are closely related. 
A) Each class should represent an appropriate mathematical concept. 
B) Each class should represent a single concept or object from the problem domain. 
C) Each class should represent no more than three specific concepts. 
D) Each class should represent multiple concepts only if they are closely related.

Question 2

All smartphones are phones, but not all phones are smartphones.This type of relationship is best described by:

Accepted Answer

A) Aggregation 
B) Dependency 
C) Inheritance 
D) Coupling 
A) Aggregation 
B) Dependency 
C) Inheritance 
D) Coupling

Question 3

When using CRC cards, UML diagrams should be created ___.

Accepted Answer

A) Prior to discovering classes. 
B) After you have discovered classes and their relationships. 
C) During the implementation phase. 
D) To produce final documentation of the system. 
A) Prior to discovering classes. 
B) After you have discovered classes and their relationships. 
C) During the implementation phase. 
D) To produce final documentation of the system.

Question 4

Consider the following code snippet:   Which of the following statements correctly describes the relationship between the Motorcycle and Tire classes?

Accepted Answer

A) Motorcycle exhibits the has-a relationship with regards to Tire. 
B) Motorcycle exhibits the is-a relationship with regard to Tire. 
C) Tire exhibits the has-a relationship with regards to Motorcycle. 
D) Tire exhibits the is-a relationship with regards to Motorcycle. 
A) Motorcycle exhibits the has-a relationship with regards to Tire. 
B) Motorcycle exhibits the is-a relationship with regard to Tire. 
C) Tire exhibits the has-a relationship with regards to Motorcycle. 
D) Tire exhibits the is-a relationship with regards to Motorcycle.

Question 5

Suppose you are developing a payroll application that computes and displays weekly paycheck amounts for various employees.As a result of the design phase, an Employee class is developed.In addition, the Payroll class is designed to store and process information for various employees.Select the code segment that best completes the Payroll class.

Accepted Answer

A)   
B)   
C)   
D)   
A)   
B)   
C)   
D)

Question 6

Why is it generally considered good practice to minimize coupling between classes?

Accepted Answer

A) Low coupling increases the operational efficiency of a program. 
B) High coupling implies less interface cohesion. 
C) High coupling increases program maintenance and hinders code reuse. 
D) Low coupling decreases the probability of code redundancy. 
A) Low coupling increases the operational efficiency of a program. 
B) High coupling implies less interface cohesion. 
C) High coupling increases program maintenance and hinders code reuse. 
D) Low coupling decreases the probability of code redundancy.

Question 7

When using the CRC method, if you determine that a class cannot carry out a particular task by itself and needs the help of another class to complete the task, you should ____.

Accepted Answer

A) Do nothing on this class's CRC card.The task will be shown on the other class's CRC card. 
B) Add this class onto the other class's CRC card as a collaborator. 
C) Add the other class onto this class's CRC card as a collaborator. 
D) Add each class onto the other class's CRC card as a collaborator. 
A) Do nothing on this class's CRC card.The task will be shown on the other class's CRC card. 
B) Add this class onto the other class's CRC card as a collaborator. 
C) Add the other class onto this class's CRC card as a collaborator. 
D) Add each class onto the other class's CRC card as a collaborator.

Question 8

During the implementation phase, which of the following statements is true?

Accepted Answer

A) Class instance variables are available from the CRC cards. 
B) Class instance variables are available from the javadocs created during the design phase. 
C) You must determine the class instance variables during implementation phase. 
D) Class instance variables can be determined from the UML diagrams. 
A) Class instance variables are available from the CRC cards. 
B) Class instance variables are available from the javadocs created during the design phase. 
C) You must determine the class instance variables during implementation phase. 
D) Class instance variables can be determined from the UML diagrams.

Question 9

A Quiz class contains an array of Question objects.This is best described as an example of ____.

Accepted Answer

A) Aggregation 
B) Cohesiveness 
C) Association 
D) Inheritance 
A) Aggregation 
B) Cohesiveness 
C) Association 
D) Inheritance

Question 10

How many responsibilities is/are recommended by researchers on a CRC card?

Accepted Answer

A) Only one per card. 
B) At most two per card. 
C) At most three per card. 
D) There is no limit of responsibilities per card. 
A) Only one per card. 
B) At most two per card. 
C) At most three per card. 
D) There is no limit of responsibilities per card.

Question 11

A CashRegister class contains an array list of Coin objects.This is best described as an example of ____.

Accepted Answer

A) Association 
B) Inheritance 
C) Cohesiveness 
D) Aggregation 
A) Association 
B) Inheritance 
C) Cohesiveness 
D) Aggregation

Question 12

Dependency between classes denotes that ____.

Accepted Answer

A) Objects of one class inherit from objects of its superclass. 
B) Objects of one class can be inherited by its subclasses. 
C) Objects of one class implement an interface. 
D) Methods in the objects of one class use an object of another class. 
A) Objects of one class inherit from objects of its superclass. 
B) Objects of one class can be inherited by its subclasses. 
C) Objects of one class implement an interface. 
D) Methods in the objects of one class use an object of another class.

Question 13

Consider the following code snippet:   This code is best described as an example of ____.

Accepted Answer

A) Inheritance and multiplicities. 
B) Aggregation and dependency. 
C) Inheritance and aggregation. 
D) Inheritance and interface. 
A) Inheritance and multiplicities. 
B) Aggregation and dependency. 
C) Inheritance and aggregation. 
D) Inheritance and interface.

Question 14

Which statement correctly describes the class relationship shown in this diagram?

Accepted Answer

A) Vehicle class depends on Car class 
B) Car class depends on Vehicle class 
C) Vehicle class inherits from Car class. 
D) Car class inherits from Vehicle class. 
A) Vehicle class depends on Car class 
B) Car class depends on Vehicle class 
C) Vehicle class inherits from Car class. 
D) Car class inherits from Vehicle class.

Question 15

Which of the following can be used to record the behavior of classes?

Accepted Answer

A) Javadoc comments 
B) Nouns and verbs in the problem description 
C) Polymorphism 
D) UML notation 
A) Javadoc comments 
B) Nouns and verbs in the problem description 
C) Polymorphism 
D) UML notation

Question 16

If many classes of a program depend on each other, we say that ____.

Accepted Answer

A) cohesiveness is high. 
B) cohesiveness is low. 
C) coupling is high. 
D) coupling is low. 
A) cohesiveness is high. 
B) cohesiveness is low. 
C) coupling is high. 
D) coupling is low.

Question 17

Suppose you are developing a payroll application that computes and displays weekly paycheck amounts for various employees.As a result of the design phase, the partial Employee class below is developed.Select the method header that best completes the class, according to the method comments.

Accepted Answer

A) public void computeSalary(double hourlyRate) 
B) public double computeSalary(double hourlyRate, int hoursWorked) 
C) public double computeSalary(double hourlyRate) 
D) public double computeSalary(int hoursWorked) 
A) public void computeSalary(double hourlyRate) 
B) public double computeSalary(double hourlyRate, int hoursWorked) 
C) public double computeSalary(double hourlyRate) 
D) public double computeSalary(int hoursWorked)

Question 18

Which statement correctly describes the class relationship shown in this diagram?

Accepted Answer

A) CashRegister class depends on Coin class 
B) Coin class depends on CashRegister class 
C) CashRegister class aggregates Coin class. 
D) Coin class inherits from CashRegister class. 
A) CashRegister class depends on Coin class 
B) Coin class depends on CashRegister class 
C) CashRegister class aggregates Coin class. 
D) Coin class inherits from CashRegister class.

Question 19

The final step of the design phase recommended by the textbook is to ____.

Accepted Answer

A) Write the documentation of the discovered classes and methods 
B) Write the code for each class and all of its methods. 
C) Identify the classes and methods that will be required. 
D) Create the UML diagrams to represent the classes. 
A) Write the documentation of the discovered classes and methods 
B) Write the code for each class and all of its methods. 
C) Identify the classes and methods that will be required. 
D) Create the UML diagrams to represent the classes.

Question 20

You have determined the need for a File class and a Folder class in your program.Which of the following would best describe the relationship between these classes?

Accepted Answer

A) Aggregation 
B) Association 
C) Composition 
D) Inheritance 
A) Aggregation 
B) Association 
C) Composition 
D) Inheritance

Exam 12: Object-Oriented Design

Which of the following is the most important consideration when designing a class?

All smartphones are phones, but not all phones are smartphones.This type of relationship is best described by:

When using CRC cards, UML diagrams should be created ___.

Consider the following code snippet: Which of the following statements correctly describes the relationship between the Motorcycle and Tire classes?

Why is it generally considered good practice to minimize coupling between classes?

When using the CRC method, if you determine that a class cannot carry out a particular task by itself and needs the help of another class to complete the task, you should ____.

During the implementation phase, which of the following statements is true?

A Quiz class contains an array of Question objects.This is best described as an example of ____.

How many responsibilities is/are recommended by researchers on a CRC card?

A CashRegister class contains an array list of Coin objects.This is best described as an example of ____.

Dependency between classes denotes that ____.

Consider the following code snippet: This code is best described as an example of ____.

Which statement correctly describes the class relationship shown in this diagram?

Which of the following can be used to record the behavior of classes?

If many classes of a program depend on each other, we say that ____.

Suppose you are developing a payroll application that computes and displays weekly paycheck amounts for various employees.As a result of the design phase, the partial Employee class below is developed.Select the method header that best completes the class, according to the method comments.

Which statement correctly describes the class relationship shown in this diagram?

The final step of the design phase recommended by the textbook is to ____.

You have determined the need for a File class and a Folder class in your program.Which of the following would best describe the relationship between these classes?

Introduction

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Implementing Classes

Fundamental Data Types

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Arrays and Array Lists

Designing Classes

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Input/Output and Exception Handling

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The Java Collections Framework

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