Question 1

Which of the following code snippets denotes that the Pen class depends on the Ink class?

Accepted Answer

A)  public class Pen extends Ink 
B)  public class Ink extends Pen 
C)  public class Pen
{
Private Ink anInk;
} 
D)  public class Ink
{
Private Pen aPen;
} 
A)  public class Pen extends Ink 
B)  public class Ink extends Pen 
C)  public class Pen
{
Private Ink anInk;
} 
D)  public class Ink
{
Private Pen aPen;
} C

Question 2

Which of the following statements will correctly put the Auto class into a package named VehiclePkg?

Accepted Answer

A)  import VehiclePkg; 
B)  import VehiclePkg.*; 
C)  package VehiclePkg; 
D)  package VehiclePkg.*; 
A)  import VehiclePkg; 
B)  import VehiclePkg.*; 
C)  package VehiclePkg; 
D)  package VehiclePkg.*; C

Question 3

Given the following diagram showing class relationships:   What type of relationship is shown between LineItem and Product?

Accepted Answer

A)  Product inherits from LineItem. 
B)  Product aggregates LineItem. 
C)  LineItem aggregates Product. 
D)  LineItem inherits from Product. 
A)  Product inherits from LineItem. 
B)  Product aggregates LineItem. 
C)  LineItem aggregates Product. 
D)  LineItem inherits from Product. C

Question 4

Which of the following most likely indicates that you have chosen a good name for your class?

Accepted Answer

A)  The name consists of a single word. 
B)  You can tell by the name what an object of the class is supposed to represent. 
C)  You can easily determine by the name how many concepts the class represents. 
D)  The name describes what task the class will perform. 
A)  The name consists of a single word. 
B)  You can tell by the name what an object of the class is supposed to represent. 
C)  You can easily determine by the name how many concepts the class represents. 
D)  The name describes what task the class will perform.

Question 5

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 6

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 nouns apply to the requirements: Customer, Address, Pet, Visit, Visit Date, Service Charge, Total Charge, Next Appointment. Which of these should be represented as classes?

Accepted Answer

A)  All of them. 
B)  Customer, Address, Pet, Visit. 
C)  Customer, Address, Pet, Visit, Service Charge. 
D)  Customer, Address, Pet, Visit, Service Charge, Total Charge, Visit Date, Next Appointment. 
A)  All of them. 
B)  Customer, Address, Pet, Visit. 
C)  Customer, Address, Pet, Visit, Service Charge. 
D)  Customer, Address, Pet, Visit, Service Charge, Total Charge, Visit Date, Next Appointment.

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

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 9

Consider the following code snippet:
Public class Motorcycle
{
Private Tire[] tires;
) . .
}
This code is best described as an example of ____.

Accepted Answer

A)  Inheritance. 
B)  Aggregation. 
C)  Polymorphism. 
D)  Association. 
A)  Inheritance. 
B)  Aggregation. 
C)  Polymorphism. 
D)  Association.

Question 10

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 11

Which of the following statements is correct?

Accepted Answer

A)  Dependency is a stronger form of aggregation. 
B)  Aggregation indicates high cohesiveness. 
C)  Aggregation indicates low coupling. 
D)  Aggregation is a stronger form of dependency. 
A)  Dependency is a stronger form of aggregation. 
B)  Aggregation indicates high cohesiveness. 
C)  Aggregation indicates low coupling. 
D)  Aggregation is a stronger form of dependency.

Question 12

Which of the following code snippets denotes that the Purse class depends on the Wallet class?

Accepted Answer

A)  public class Purse extends Wallet 
B)  public class Wallet extends Purse 
C)  public class Wallet
{
Private Purse aPurse;
} 
D)  public class Purse
{
Private Wallet aWallet;
} 
A)  public class Purse extends Wallet 
B)  public class Wallet extends Purse 
C)  public class Wallet
{
Private Purse aPurse;
} 
D)  public class Purse
{
Private Wallet aWallet;
}

Question 13

Aggregation 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 contain references to objects of its superclass. 
D)  Objects of one class contain references to objects 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 contain references to objects of its superclass. 
D)  Objects of one class contain references to objects of another class.

Question 14

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 15

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 16

A/an ____ represents a set of objects with the same behavior.

Accepted Answer

A)  Association 
B)  Aggregation 
C)  Dependency 
D)  Class 
A)  Association 
B)  Aggregation 
C)  Dependency 
D)  Class

Question 17

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 18

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

Accepted Answer

A)  Aggregated classes will yield subclasses. 
B)  Aggregated classes will yield instance variables. 
C)  Aggregated classes will yield class packages. 
D)  Aggregated classes will yield interfaces. 
A)  Aggregated classes will yield subclasses. 
B)  Aggregated classes will yield instance variables. 
C)  Aggregated classes will yield class packages. 
D)  Aggregated classes will yield interfaces.

Question 19

After you have identified a set of classes needed for a program, you should now ____.

Accepted Answer

A)  Define the behavior of each class. 
B)  Look for nouns that describe the tasks. 
C)  Begin writing the code for the classes. 
D)  Establish the relationships between the classes. 
A)  Define the behavior of each class. 
B)  Look for nouns that describe the tasks. 
C)  Begin writing the code for the classes. 
D)  Establish the relationships between the classes.

Question 20

The textbook recommends a five-part program development process consisting of the following activities:
I Use UML diagrams to record class relationships.
II Gather requirements.
III Implement the program.
IV Use CRC cards to identify classes.
V Use javadoc to document method behavior.
Which is the correct order in which these activities should be completed?

Accepted Answer

A)  IV, II, I, III, V 
B)  IV, II, I, V, III 
C)  II, IV, I, III, V 
D)  II, IV, I, V, III 
A)  IV, II, I, III, V 
B)  IV, II, I, V, III 
C)  II, IV, I, III, V 
D)  II, IV, I, V, III

Exam 12: Object-Oriented Design

Which of the following code snippets denotes that the Pen class depends on the Ink class?

Which of the following statements will correctly put the Auto class into a package named VehiclePkg?

Given the following diagram showing class relationships: What type of relationship is shown between LineItem and Product?

Which of the following most likely indicates that you have chosen a good name for your class?

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

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 ____.

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

Consider the following code snippet: Public class Motorcycle { Private Tire[] tires; ) . . } This code is best described as an example of ____.

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

Which of the following statements is correct?

Which of the following code snippets denotes that the Purse class depends on the Wallet class?

Aggregation denotes that ____.

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

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

A/an ____ represents a set of objects with the same behavior.

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

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

After you have identified a set of classes needed for a program, you should now ____.

Introduction

Fundamental Data Types

Decisionseasy

Loops

Methods

Arrays and Arraylists

Inputoutput and Exception Handling

Objects and Classes

Inheritance and Interfaces

Graphical User Interfaces

Advanced User Interfaces

Recursion

Sorting and Searching

The Java Collections Framework

Basic Data Structures

Tree Structures

Generic Classes

Streams and Binary Inputoutput

Multithreading

Internet Networking

Relational Databases

XML

Web Applications

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