Question 1

Which of the following code snippets denotes that the Kitchen class depends on the Stove class?

Accepted Answer

A)  public class Kitchen extends Stove 
B)  public class Stove
{
Private Kitchen[] kitchens;
} 
C)  public class Kitchen
{
Private Stove aStove;
} 
D)  public class Kitchen implements Stove 
A)  public class Kitchen extends Stove 
B)  public class Stove
{
Private Kitchen[] kitchens;
} 
C)  public class Kitchen
{
Private Stove aStove;
} 
D)  public class Kitchen implements Stove

Question 2

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 3

Select a code segment to complete the Name class, so that it reflects a dependency relationship between Name and String. public class Name ___________________________

Accepted Answer

A) extends String { … } B) { Private String first; Private String second; … } C) implements String { … } D) { Private ArrayList names; … } A) extends String { … } B) { Private String first; Private String second; … } C) implements String { … } D) { Private ArrayList names; … }

Question 4

Which of the following code snippets denotes that the Kitchen class aggregates the Dish class?

Accepted Answer

A)  public class Kitchen extends Dish 
B)  public class Dish extends Kitchen 
C)  public class Kitchen
{
Private Dish[] dishes;
} 
D)  public class Dish
{
Private Kitchen myKitchen;
} 
A)  public class Kitchen extends Dish 
B)  public class Dish extends Kitchen 
C)  public class Kitchen
{
Private Dish[] dishes;
} 
D)  public class Dish
{
Private Kitchen myKitchen;
}

Question 5

Which of the following would be an appropriate name for a game-related class?

Accepted Answer

A)  FinalizeLevelOne 
B)  InitialLevel 
C)  ResetTheCurrentLevel 
D)  AscendToFinalLevel 
A)  FinalizeLevelOne 
B)  InitialLevel 
C)  ResetTheCurrentLevel 
D)  AscendToFinalLevel

Question 6

Consider the following code snippet: public class Motorcycle extends Vehicle
{
Private Tire[] tires;
) . .
}
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 association. 
A)  Inheritance and multiplicities. 
B)  Aggregation and dependency. 
C)  Inheritance and aggregation. 
D)  Inheritance and association.

Question 7

____ is often described as the has-a relationship.

Accepted Answer

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

Question 8

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 9

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 10

A class (ClassOne) is considered to have a dependency on another class (ClassTwo) under which of the following conditions?

Accepted Answer

A)  Each class uses objects of the other. 
B)  The public interfaces of both classes are cohesive. 
C)  ClassTwo uses objects of ClassOne. 
D)  ClassOne uses objects of ClassTwo. 
A)  Each class uses objects of the other. 
B)  The public interfaces of both classes are cohesive. 
C)  ClassTwo uses objects of ClassOne. 
D)  ClassOne uses objects of ClassTwo.

Question 11

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 12

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

Accepted Answer

A)  Address inherits from Invoice. 
B)  Invoice aggregates Address. 
C)  Address aggregates Invoice. 
D)  Invoice inherits from Address. 
A)  Address inherits from Invoice. 
B)  Invoice aggregates Address. 
C)  Address aggregates Invoice. 
D)  Invoice inherits from Address.

Question 13

Consider the following code snippet: public class SailBoat extends Vessel
{
Private Engine[] engines;
Private Sail mainsail;
) . .
}
Which of the following statements is NOT correct?

Accepted Answer

A)  SailBoat inherits from Vessel. 
B)  Sail depends on Sailboat. 
C)  Sailboat aggregates Engine. 
D)  SailBoat aggregates Sail. 
A)  SailBoat inherits from Vessel. 
B)  Sail depends on Sailboat. 
C)  Sailboat aggregates Engine. 
D)  SailBoat aggregates Sail.

Question 14

How does a UML diagram denote classes and their attributes and methods?

Accepted Answer

A)  A class rectangle contains the class name in the top, methods in the middle, and attributes in the bottom. 
B)  A class rectangle contains the class name in the top, attributes in the middle, and methods in the bottom. 
C)  A class rectangle contains the methods in the top, class name in the middle, and attributes in the bottom. 
D)  A class rectangle contains the attributes in the top, methods in the middle, and class name in the bottom. 
A)  A class rectangle contains the class name in the top, methods in the middle, and attributes in the bottom. 
B)  A class rectangle contains the class name in the top, attributes in the middle, and methods in the bottom. 
C)  A class rectangle contains the methods in the top, class name in the middle, and attributes in the bottom. 
D)  A class rectangle contains the attributes in the top, methods in the middle, and class name in the bottom.

Question 15

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 16

Which of the followings statements about class relationships is correct?

Accepted Answer

A)  Inheritance represents the is-a relationship, while aggregation represents the has-a relationship. 
B)  Inheritance represents the has-a relationship, while dependency represents the uses relationship. 
C)  Aggregation represents the is-a relationship, while inheritance represents the uses relationship. 
D)  Aggregation represents the has-a relationship, while dependence represents the is-a relationship. 
A)  Inheritance represents the is-a relationship, while aggregation represents the has-a relationship. 
B)  Inheritance represents the has-a relationship, while dependency represents the uses relationship. 
C)  Aggregation represents the is-a relationship, while inheritance represents the uses relationship. 
D)  Aggregation represents the has-a relationship, while dependence represents the is-a relationship.

Question 17

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

Question 18

Which of the following statements about class attributes is true?

Accepted Answer

A)  An attribute always corresponds to an instance variable of the class. 
B)  An attribute is an externally observable property that objects of the class have. 
C)  An attribute is used to represent aggregation with another class. 
D)  Attributes cannot be represented in UML diagrams. 
A)  An attribute always corresponds to an instance variable of the class. 
B)  An attribute is an externally observable property that objects of the class have. 
C)  An attribute is used to represent aggregation with another class. 
D)  Attributes cannot be represented in UML diagrams.

Question 19

In general, you need ____ when an object needs to remember another object between method calls.

Accepted Answer

A)  inheritance 
B)  aggregation 
C)  association 
D)  an interface implementation 
A)  inheritance 
B)  aggregation 
C)  association 
D)  an interface implementation

Question 20

If you have parallel arrays or array lists of the same length which each store a part of what could be considered an object, ____.

Accepted Answer

A)  You should rewrite the program to use a two-dimensional array. 
B)  You should rewrite the program to use a two-dimensional array list. 
C)  You should create a class to hold the related data in the ith slice of each array, and then create an arraylist of objects. 
D)  There are no alternatives to this type of program design. 
A)  You should rewrite the program to use a two-dimensional array. 
B)  You should rewrite the program to use a two-dimensional array list. 
C)  You should create a class to hold the related data in the ith slice of each array, and then create an arraylist of objects. 
D)  There are no alternatives to this type of program design.

Exam 12: Object-Oriented Design

Which of the following code snippets denotes that the Kitchen class depends on the Stove class?

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

Select a code segment to complete the Name class, so that it reflects a dependency relationship between Name and String. public class Name ___________________________

Which of the following code snippets denotes that the Kitchen class aggregates the Dish class?

Which of the following would be an appropriate name for a game-related class?

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

____ is often described as the has-a relationship.

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

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

A class (ClassOne) is considered to have a dependency on another class (ClassTwo) under which of the following conditions?

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

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

Consider the following code snippet: public class SailBoat extends Vessel { Private Engine[] engines; Private Sail mainsail; ) . . } Which of the following statements is NOT correct?

How does a UML diagram denote classes and their attributes and methods?

Which of the followings statements about class relationships is correct?

Which of the following statements about class attributes is true?

In general, you need ____ when an object needs to remember another object between method calls.

If you have parallel arrays or array lists of the same length which each store a part of what could be considered an object, ____.

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