Question 1

The private implementation of a class consists of ___.

Accepted Answer

A) instance variables and the method headers 
B) local variables and the method headers 
C) parameter variables and the method bodies 
D) instance variables and the implementation of the constructors and methods 
A) instance variables and the method headers 
B) local variables and the method headers 
C) parameter variables and the method bodies 
D) instance variables and the implementation of the constructors and methods

Question 2

Descriptive text used to communicate design and implementation issues about the classes and public methods of programs is called _______?

Accepted Answer

A) components 
B) comments 
C) constants 
D) commands 
A) components 
B) comments 
C) constants 
D) commands

Question 3

When drawing complex shapes, what is used to initialize the position of the shape?

Accepted Answer

A) constructor 
B) viewer 
C) component 
D) frame 
A) constructor 
B) viewer 
C) component 
D) frame

Question 4

We want to create a class that represents a date.A date has a day, month, and year.For example, the date March 16, 2014 has the day 16, month 3, and year 2014.The basic framework of a date class is below: public class Date
{
private int day;
private int month;
private int year;
}
The default date will be set to January 1, 1990. What should the body of the constructor with zero parameters be?

Accepted Answer

A)  day = 1;
month =1 ;
year = 1990; 
B)  Int day =1;
Int month =1;
int year =1990 ; 
C)  int day =0;
Int month =1;
Int year = 1990; 
D)  Int day =1;
int month =1;
Int year =0; 
A)  day = 1;
month =1 ;
year = 1990; 
B)  Int day =1;
Int month =1;
int year =1990 ; 
C)  int day =0;
Int month =1;
Int year = 1990; 
D)  Int day =1;
int month =1;
Int year =0;

Question 5

When using index cards to help with the tracing of the execution of an object by hand, what is written on the front of the card?

Accepted Answer

A) The names of all known tester classes for the object. 
B) The key equations implemented by the constructor. 
C) A table with the values of all of the instance variables. 
D) The methods that the object can execute. 
A) The names of all known tester classes for the object. 
B) The key equations implemented by the constructor. 
C) A table with the values of all of the instance variables. 
D) The methods that the object can execute.

Question 6

Given this method comment, fill in the blank in the method implementation.

Accepted Answer

A) balance 
B) @return 
C) double 
D) return 
A) balance 
B) @return 
C) double 
D) return

Question 7

The class constructor always has the same name as __.

Accepted Answer

A) access specifier 
B) class 
C) instance variable 
D) parameter variable 
A) access specifier 
B) class 
C) instance variable 
D) parameter variable

Question 8

What will be output from the following statements that use BankAccount class?

Accepted Answer

A) 150.0 200.0 250.0 
B) 150.0 150.0 150.0 
C) 250.0 250.0 250.0 
D) 200.0 150.0 200.0 
A) 150.0 200.0 250.0 
B) 150.0 150.0 150.0 
C) 250.0 250.0 250.0 
D) 200.0 150.0 200.0

Question 9

What is the name of the instance variable for a Counter object?

Accepted Answer

A) getValue 
B) click 
C) concertCounter 
D) value 
A) getValue 
B) click 
C) concertCounter 
D) value

Question 10

What statement is used to specify the value that a method gives back to its caller?

Accepted Answer

A) new 
B) public 
C) private 
D) return 
A) new 
B) public 
C) private 
D) return

Question 11

The public constructors and methods of a class form the public _____ of the class.

Accepted Answer

A) interface 
B) initialization 
C) implementation 
D) encapsulation 
A) interface 
B) initialization 
C) implementation 
D) encapsulation

Question 12

We want to change the BankAccount class so that all accounts will have a monthly fee.The instance variable monthlyFee will hold the monthly fee.Which of the following constructors properly sets the monthly fee to a default value of 20?

Accepted Answer

A)  public BankAccount (double initialBalance)
{
balance = initialBalance;
monthlyFee = 20;
} 
B)  public Bankaccount (double initialBalance)
{
balance = initialBalance;
double monthlyFee = 20;
} 
C)  public BankAccount (double initialBalance)
{ 
balance = initialBalance;
monthlyFee = initialBalance-20;
} 
D)  public BankAccount (double initialBalance)
{ 
balance = initialBalance-20;
} 
A)  public BankAccount (double initialBalance)
{
balance = initialBalance;
monthlyFee = 20;
} 
B)  public Bankaccount (double initialBalance)
{
balance = initialBalance;
double monthlyFee = 20;
} 
C)  public BankAccount (double initialBalance)
{ 
balance = initialBalance;
monthlyFee = initialBalance-20;
} 
D)  public BankAccount (double initialBalance)
{ 
balance = initialBalance-20;
}

Question 13

What mechanism does an object use to store its data?

Accepted Answer

A) files 
B) methods 
C) instance variables 
D) access specifiers 
A) files 
B) methods 
C) instance variables 
D) access specifiers

Question 14

We want to change the BankAccount class so that all accounts will have a monthly fee.The instance variable monthlyFee will hold the monthly fee.Which of the following is the correct public interface for a constructor that sets both the initial balance and monthly fee?

Accepted Answer

A)  public BankAccount (double initialBalance, monthlyFee) 
B)  public BankAccount (double initialBalance, double monthlyFee) 
C)  public Bankaccount (double initialBalance) has monthlyFee 
D)  public BankAccount (double initialBalance) 
{
double monthlyFee;
/ / The rest of the constructor code follows
} 
A)  public BankAccount (double initialBalance, monthlyFee) 
B)  public BankAccount (double initialBalance, double monthlyFee) 
C)  public Bankaccount (double initialBalance) has monthlyFee 
D)  public BankAccount (double initialBalance) 
{
double monthlyFee;
/ / The rest of the constructor code follows
}

Question 15

Which of the following corresponds to the constructor body for a Square class that accepts an initial side length value called initialLength where the instance variable is named sideLength?

Accepted Answer

A) sideLength = initialLength; 
B) initialLength = sideLength; 
C) initialLength = 0; 
D) sideLength = 0; 
A) sideLength = initialLength; 
B) initialLength = sideLength; 
C) initialLength = 0; 
D) sideLength = 0;

Question 16

We want to change the BankAccount class so that all accounts will have a monthly fee.The instance variable monthlyFee will hold the monthly fee.Which of the following methods deducts the value of the monthly fee from the account?

Accepted Answer

A)  public void chargefee()
{
balance = balance - monthlyFee;
} 
B)  public void chargefee()
{
initialBalance = initialBalance - monthlyFee;
} 
C)  public void chargeFee()
{
balance = monthlyFee;
} 
D)  public void chargefee()
{
balance - monthlyFee;
} 
A)  public void chargefee()
{
balance = balance - monthlyFee;
} 
B)  public void chargefee()
{
initialBalance = initialBalance - monthlyFee;
} 
C)  public void chargeFee()
{
balance = monthlyFee;
} 
D)  public void chargefee()
{
balance - monthlyFee;
}

Question 17

When are instance variables initialized?

Accepted Answer

A) Instance variables are initialized when the method is called. 
B) Instance variables are initialized with a default value before a constructor is invoked. 
C) You must initialize instance variables in the constructor. 
D) You must initialize instance variables in a method body. 
A) Instance variables are initialized when the method is called. 
B) Instance variables are initialized with a default value before a constructor is invoked. 
C) You must initialize instance variables in the constructor. 
D) You must initialize instance variables in a method body.

Question 18

Which part of a class implementation contains the instructions to initialize an object's instance variables?

Accepted Answer

A) constructor 
B) access specifier 
C) initializer 
D) type name 
A) constructor 
B) access specifier 
C) initializer 
D) type name

Question 19

Which term means the process of hiding object data and providing methods for data access?

Accepted Answer

A) documentation 
B) encapsulation 
C) instantiation 
D) abstraction 
A) documentation 
B) encapsulation 
C) instantiation 
D) abstraction

Question 20

Instance variables that are object references are initialized to what default value?

Accepted Answer

A) empty 
B) Instance variables are not initialized to a default value. 
C) null 
D) nil 
A) empty 
B) Instance variables are not initialized to a default value. 
C) null 
D) nil

Exam 3: Implementing Classes

The private implementation of a class consists of ___.

Descriptive text used to communicate design and implementation issues about the classes and public methods of programs is called _______?

When drawing complex shapes, what is used to initialize the position of the shape?

When using index cards to help with the tracing of the execution of an object by hand, what is written on the front of the card?

Given this method comment, fill in the blank in the method implementation.

The class constructor always has the same name as __.

What will be output from the following statements that use BankAccount class?

What is the name of the instance variable for a Counter object?

What statement is used to specify the value that a method gives back to its caller?

The public constructors and methods of a class form the public _____ of the class.

We want to change the BankAccount class so that all accounts will have a monthly fee.The instance variable monthlyFee will hold the monthly fee.Which of the following constructors properly sets the monthly fee to a default value of 20?

What mechanism does an object use to store its data?

We want to change the BankAccount class so that all accounts will have a monthly fee.The instance variable monthlyFee will hold the monthly fee.Which of the following is the correct public interface for a constructor that sets both the initial balance and monthly fee?

Which of the following corresponds to the constructor body for a Square class that accepts an initial side length value called initialLength where the instance variable is named sideLength?

We want to change the BankAccount class so that all accounts will have a monthly fee.The instance variable monthlyFee will hold the monthly fee.Which of the following methods deducts the value of the monthly fee from the account?

When are instance variables initialized?

Which part of a class implementation contains the instructions to initialize an object's instance variables?

Which term means the process of hiding object data and providing methods for data access?

Instance variables that are object references are initialized to what default value?

Introduction

Using Objects

Fundamental Data Types

Decisions

Loops

Arrays and Array Lists

Designing Classes

Inheritance

Interfaces

Input/Output and Exception Handling

Object-Oriented Design

Recursion

Sorting and Searching

The Java Collections Framework

Basic Data Structures

Tree Structures

Generic Classes

Stream Processing

Graphical User Interfaces

Advanced Input/Output

Multithreading

Internet Networking

Relational Databases

XML

Filters