Question 1

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 2

Suppose that the invoice-printing application from section 12.3 needs to be enhanced by including the computation and printing of sales taxes as needed. Since some vendors charge no sales taxes, the original Invoice class needs to be preserved. Select the code segment that best illustrates reuse of the existing Invoice class. public class TaxableInvoice ___________________________

Accepted Answer

A) extends Invoice { … } B) { Private Invoice originalInvoice; … } C) implements Invoice { … } D) { Private ArrayList invoices; … } A) extends Invoice { … } B) { Private Invoice originalInvoice; … } C) implements Invoice { … } D) { Private ArrayList invoices; … }

Question 3

UML means____.

Accepted Answer

A)  Unified Mode Language 
B)  User Modeling Language 
C)  User Mode Language. 
D)  Unified Modeling Language. 
A)  Unified Mode Language 
B)  User Modeling Language 
C)  User Mode Language. 
D)  Unified Modeling Language.

Question 4

Which of the following code snippets denotes that the Rose class inherits from the Flower class?

Accepted Answer

A)  public class Flower extends Rose 
B)  public class Rose extends Flower 
C)  public class Rose
{
Private Flower[] flowers;
} 
D)  public class Flower
{
Private Rose[] limes;
} 
A)  public class Flower extends Rose 
B)  public class Rose extends Flower 
C)  public class Rose
{
Private Flower[] flowers;
} 
D)  public class Flower
{
Private Rose[] limes;
}

Question 5

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 6

You have determined a need for an Employee class and a TemporaryEmployee class in your program. Which relationship is most appropriate between these classes?

Accepted Answer

A)  Inheritance 
B)  Aggregation 
C)  Dependency 
D)  Interface implementation 
A)  Inheritance 
B)  Aggregation 
C)  Dependency 
D)  Interface implementation

Question 7

Select a code segment to complete the Player class, so that it reflects an inheritance relationship between Player and Person. public class Player ___________________________

Accepted Answer

A) extends Person { … } B) { Private Person thePlayer; … } C) implements Person { … } D) { Private ArrayList players; … } A) extends Person { … } B) { Private Person thePlayer; … } C) implements Person { … } D) { Private ArrayList players; … }

Question 8

You are designing a software solution for a veterinary clinic. The clinic provides various services for each pet on each visit. You have decided that the following classes are needed: Customer, Address, Pet, and Visit. Which of these should be represented as aggregation?

Accepted Answer

A)  Customer class aggregates Address, Pet, and Visit classes. 
B)  Visit class aggregates Address class. 
C)  Pet class aggregates Address class. 
D)  Pet class aggregates Customer class. 
A)  Customer class aggregates Address, Pet, and Visit classes. 
B)  Visit class aggregates Address class. 
C)  Pet class aggregates Address class. 
D)  Pet class aggregates Customer class.

Question 9

Which of the following code snippets denotes that the Lime class inherits from the Citrus class?

Accepted Answer

A) public class Lime extends Citrus B) public class Citrus extends Lime C) public class Lime { Private ArrayList fruits; } D) public class Citrus { Private ArrayList limes; } A) public class Lime extends Citrus B) public class Citrus extends Lime C) public class Lime { Private ArrayList fruits; } D) public class Citrus { Private ArrayList limes; }

Question 10

When designing classes, if you find classes with common behavior you should ____.

Accepted Answer

A)  Combine them all into a single class. 
B)  Place the common behavior into a superclass. 
C)  Place the common behavior into a subclass. 
D)  Give them similar names. 
A)  Combine them all into a single class. 
B)  Place the common behavior into a superclass. 
C)  Place the common behavior into a subclass. 
D)  Give them similar names.

Question 11

You are designing a software solution for an automobile rental company. You have decided that the following nouns apply to the requirements: Auto, Customer, Address, Rental Contract, Mileage, Rental Date, Daily Rate, Total. Which of these should be represented as classes?

Accepted Answer

A)  All of them. 
B)  Auto, Customer, Address, Rental Contract. 
C)  Auto, Customer, Address, Rental Contract, Mileage. 
D)  Auto, Customer, Address, Rental Contract, Mileage, Rental Date, Daily Rate. 
A)  All of them. 
B)  Auto, Customer, Address, Rental Contract. 
C)  Auto, Customer, Address, Rental Contract, Mileage. 
D)  Auto, Customer, Address, Rental Contract, Mileage, Rental Date, Daily Rate.

Question 12

Which of the following questions should you ask yourself in order to determine if you have named your class properly?

Accepted Answer

A)  Does the class name contain 8 or fewer characters? 
B)  Is the class name a verb? 
C)  Can I visualize an object of the class? 
D)  Does the class name describe the tasks that this class will accomplish? 
A)  Does the class name contain 8 or fewer characters? 
B)  Is the class name a verb? 
C)  Can I visualize an object of the class? 
D)  Does the class name describe the tasks that this class will accomplish?

Question 13

In a UML diagram, the relationship symbol shown below denotes ____.

Accepted Answer

A)  inheritance 
B)  aggregation 
C)  dependency 
D)  interface implementation 
A)  inheritance 
B)  aggregation 
C)  dependency 
D)  interface implementation

Question 14

Select a code segment to complete the Team class, so that it reflects an aggregation relationship between Team and Player. public class Team ___________________________

Accepted Answer

A) extends Player { … } B) { Private Player aPlayer; … } C) implements Player { … } D) { Private ArrayList players; … } A) extends Player { … } B) { Private Player aPlayer; … } C) implements Player { … } D) { Private ArrayList players; … }

Question 15

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. public class Employee
{
Private int hoursWorked;
/**
Computes the weekly salary for this employee.
@param hourlyRate the rate per hour earned by the employee
@return the weekly salary
*/
_________________________________________
{
// method body
}
}

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 16

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 17

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 18

Select a code segment to complete the SmartPhone class, so that it reflects an interface implementation relationship between SmartPhone and MP3Player. public class SmartPhone ___________________________

Accepted Answer

A)  extends MP3Player
{
…
} 
B)  {
Private MP3Player musicPlayer;
…
} 
C)  implements MP3Player
{
…
} 
D)  implements interface MP3Player
{
…
} 
A)  extends MP3Player
{
…
} 
B)  {
Private MP3Player musicPlayer;
…
} 
C)  implements MP3Player
{
…
} 
D)  implements interface MP3Player
{
…
}

Question 19

How does a UML diagram denote a multiplicity of one or more in an aggregation relationship?

Accepted Answer

A)  * 
B)  1..* 
C)  *..1 
D)  1..n 
A)  * 
B)  1..* 
C)  *..1 
D)  1..n

Question 20

In a UML diagram, the relationship symbol shown below denotes ____.

Accepted Answer

A)  inheritance 
B)  aggregation 
C)  dependency 
D)  interface implementation 
A)  inheritance 
B)  aggregation 
C)  dependency 
D)  interface implementation

Exam 12: Object-Oriented Design

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

UML means____.

Which of the following code snippets denotes that the Rose class inherits from the Flower class?

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

You have determined a need for an Employee class and a TemporaryEmployee class in your program. Which relationship is most appropriate between these classes?

Select a code segment to complete the Player class, so that it reflects an inheritance relationship between Player and Person. public class Player ___________________________

You are designing a software solution for a veterinary clinic. The clinic provides various services for each pet on each visit. You have decided that the following classes are needed: Customer, Address, Pet, and Visit. Which of these should be represented as aggregation?

Which of the following code snippets denotes that the Lime class inherits from the Citrus class?

When designing classes, if you find classes with common behavior you should ____.

You are designing a software solution for an automobile rental company. You have decided that the following nouns apply to the requirements: Auto, Customer, Address, Rental Contract, Mileage, Rental Date, Daily Rate, Total. Which of these should be represented as classes?

Which of the following questions should you ask yourself in order to determine if you have named your class properly?

In a UML diagram, the relationship symbol shown below denotes ____.

Select a code segment to complete the Team class, so that it reflects an aggregation relationship between Team and Player. public class Team ___________________________

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

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

Select a code segment to complete the SmartPhone class, so that it reflects an interface implementation relationship between SmartPhone and MP3Player. public class SmartPhone ___________________________

How does a UML diagram denote a multiplicity of one or more in an aggregation relationship?

In a UML diagram, the relationship symbol shown below denotes ____.

Introduction

Using Objects

Implementing Classes

Fundamental Data Types

Decisions

Loops

Arrays and Array Lists

Designing Classes

Inheritance

Interfaces

Inputoutput and Exception Handling

Recursion

Sorting and Searching

The Java Collections Framework

Basic Data Structures

Tree Structures

Generic Classes

Graphical User Interfaces

Streams and Binary Inputoutput

Multithreading

Internet Networking

Relational Databases

XML

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