Question 1

Which of the following statements about associations between classes is true?

Accepted Answer

A)  A class is associated with another class if both classes are in the same package. 
B)  A class is associated with another class if the class inherits from the other class. 
C)  A class is associated with another class if the other class inherits from this class. 
D)  A class is associated with another class if you can navigate from objects of one class to objects of the other class. 
A)  A class is associated with another class if both classes are in the same package. 
B)  A class is associated with another class if the class inherits from the other class. 
C)  A class is associated with another class if the other class inherits from this class. 
D)  A class is associated with another class if you can navigate from objects of one class to objects of the other class. D

Question 2

____ relationships come from the collaboration columns on the CRC cards.

Accepted Answer

A)  Association 
B)  Inheritance 
C)  Dependency 
D)  Attribute 
A)  Association 
B)  Inheritance 
C)  Dependency 
D)  Attribute C

Question 3

Consider the following code snippet: public class PowerBoat extends Vessel
{
Private Engine[] engines;
) . .
}
This code is best described as an example of ____.

Accepted Answer

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

Question 4

Classes often correspond to ____ in a requirements description.

Accepted Answer

A)  Verbs 
B)  Nouns 
C)  Dependencies 
D)  Relationships 
A)  Verbs 
B)  Nouns 
C)  Dependencies 
D)  Relationships

Question 5

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 6

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 7

Which of the following code snippets denotes that the Fleet class aggregates the Taxi class?

Accepted Answer

A) public class Fleet extends Taxi B) public class Taxi extends Fleet C) public class Fleet { Private ArrayList taxicabs; } D) public class Taxi { Private Fleet myFleet; } A) public class Fleet extends Taxi B) public class Taxi extends Fleet C) public class Fleet { Private ArrayList taxicabs; } D) public class Taxi { Private Fleet myFleet; }

Question 8

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 instance variables?

Accepted Answer

A)  Mileage 
B)  Mileage, Daily Rate. 
C)  Mileage, Rental Date, Daily Rate. 
D)  Mileage, Rental Date, Daily Rate, Total. 
A)  Mileage 
B)  Mileage, Daily Rate. 
C)  Mileage, Rental Date, Daily Rate. 
D)  Mileage, Rental Date, Daily Rate, Total.

Question 9

You are designing an application to support an automobile rental agency. Which of the following probably should NOT be represented as an object?

Accepted Answer

A)  Auto 
B)  Customer 
C)  Payment amount 
D)  Rental contract 
A)  Auto 
B)  Customer 
C)  Payment amount 
D)  Rental contract

Question 10

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

Accepted Answer

A)  Product inherits from Invoice. 
B)  Product aggregates Invoice. 
C)  Invoice inherits from Product. 
D)  Invoice is dependent on Product. 
A)  Product inherits from Invoice. 
B)  Product aggregates Invoice. 
C)  Invoice inherits from Product. 
D)  Invoice is dependent on Product.

Question 11

____ is often described as the is-a relationship.

Accepted Answer

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

Question 12

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 13

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. public class Payroll ___________________________

Accepted Answer

A) extends Employee { … } B) { Public static void main(String[] args) { Employee anEmployee; … } C) { Public static void main(String[] args) { Int hoursWorked; Double hourlyRate; … } } D) { Public static void main(String[] args) { ArrayList employees; … } } A) extends Employee { … } B) { Public static void main(String[] args) { Employee anEmployee; … } C) { Public static void main(String[] args) { Int hoursWorked; Double hourlyRate; … } } D) { Public static void main(String[] args) { ArrayList employees; … } }

Question 14

Suppose that the invoice-printing application from section 12.3 needs to be enhanced by making it possible for class InvoicePrinter to store several invoices to be printed. Select the code segment that best illustrates reuse of the existing Invoice class for this purpose. public class InvoicePrinter ___________________________

Accepted Answer

A) extends Invoice { … } B) { Public static void main(String[] args) { Invoice invoice1; Invoice invoice2; … } C) implements Invoice { … } D) { Public static void main(String[] args) { ArrayList invoices; … } } A) extends Invoice { … } B) { Public static void main(String[] args) { Invoice invoice1; Invoice invoice2; … } C) implements Invoice { … } D) { Public static void main(String[] args) { ArrayList invoices; … } }

Question 15

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 16

Which of the following would be an appropriate name for a class used in an inventory application?

Accepted Answer

A)  Product 
B)  InitializeInventoryLevel 
C)  ResetCurrentInventoryLevel 
D)  ReceiveNewProducts 
A)  Product 
B)  InitializeInventoryLevel 
C)  ResetCurrentInventoryLevel 
D)  ReceiveNewProducts

Question 17

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 18

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

Accepted Answer

A)  Customer aggregates BankAccount, indicating that a customer may have 2 bank accounts. 
B)  BankAccount aggregates Customer, indicating that 2 customers may share a bank account. 
C)  BankAccount depends on Customer, indicating that many customers may have 2 bank accounts. 
D)  Customer depends on BankAccount, indicating that a customer may have 2 bank accounts. 
A)  Customer aggregates BankAccount, indicating that a customer may have 2 bank accounts. 
B)  BankAccount aggregates Customer, indicating that 2 customers may share a bank account. 
C)  BankAccount depends on Customer, indicating that many customers may have 2 bank accounts. 
D)  Customer depends on BankAccount, indicating that a customer may have 2 bank accounts.

Question 19

Consider the following code snippet: public class Motorcycle extends Vehicle
{
Private Tire[] tires;
Private Engine anEngine;
) . .
}
Which of the following statements describing relationships between the Motorcycle, Tire, Engine and Vehicle classes is NOT correct?

Accepted Answer

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

Question 20

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

Accepted Answer

A)  Method parameter variables are available from the CRC cards. 
B)  Method parameter variables are available from the javadocs created during the design phase. 
C)  You must determine the method parameter variables during implementation phase. 
D)  Method parameter variables are available from the UML diagrams. 
A)  Method parameter variables are available from the CRC cards. 
B)  Method parameter variables are available from the javadocs created during the design phase. 
C)  You must determine the method parameter variables during implementation phase. 
D)  Method parameter variables are available from the UML diagrams.

Exam 12: Object-Oriented Design

Which of the following statements about associations between classes is true?

____ relationships come from the collaboration columns on the CRC cards.

Consider the following code snippet: public class PowerBoat extends Vessel { Private Engine[] engines; ) . . } This code is best described as an example of ____.

Classes often correspond to ____ in a requirements description.

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

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

Which of the following code snippets denotes that the Fleet class aggregates the Taxi class?

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 instance variables?

You are designing an application to support an automobile rental agency. Which of the following probably should NOT be represented as an object?

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

____ is often described as the is-a relationship.

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

Dependency between classes denotes that ____.

Which of the following would be an appropriate name for a class used in an inventory application?

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

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

Consider the following code snippet: public class Motorcycle extends Vehicle { Private Tire[] tires; Private Engine anEngine; ) . . } Which of the following statements describing relationships between the Motorcycle, Tire, Engine and Vehicle classes is NOT correct?

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

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

Web Applications

Filters