Question 1

Instance variables that are numbers are initialized to what default value?

Accepted Answer

A)  Instance variables are not initialized to a default value. 
B)  nil 
C)  0 
D)  null 
A)  Instance variables are not initialized to a default value. 
B)  nil 
C)  0 
D)  null C

Question 2

We want to change the BankAccount class so that all accounts will have a monthly fee. When a BankAccount is created, its monthly fee is set and cannot be changed. 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;
} A

Question 3

A class declaration consists of which of the following parts?

Accepted Answer

A)  an access specifier, the keyword class, the name of the class, declarations for instance variables, constructors, and methods 
B)  an access specifier, a return type, a method name, a list of the parameters (if any), and the body of the method 
C)  the keyword class, the name of the class, declarations for instance variables, constructors, and methods 
D)  an access specifier, the name of the class, a list of the parameters (if any), and the body of the constructor 
A)  an access specifier, the keyword class, the name of the class, declarations for instance variables, constructors, and methods 
B)  an access specifier, a return type, a method name, a list of the parameters (if any), and the body of the method 
C)  the keyword class, the name of the class, declarations for instance variables, constructors, and methods 
D)  an access specifier, the name of the class, a list of the parameters (if any), and the body of the constructor A

Question 4

What is the name of the constructor for the BankAccount class?

Accepted Answer

A)  BankAccount 
B)  deposit 
C)  balance 
D)  withdraw 
A)  BankAccount 
B)  deposit 
C)  balance 
D)  withdraw

Question 5

Assuming the following code is the body of the deposit method, what output is generated by the valid call myAccount.deposit(1000) for an account with an initial balance of 500? public void deposit(double amount)
{
System.out.println(amount);
Double newBalance = balance + amount;
Balance = newBalance;
}

Accepted Answer

A)  1500.0 
B)  The code fragment has a syntax error and does not compile. 
C)  The code fragment does not compile because the parameter variable is not initialized. 
D)  1000.0 
A)  1500.0 
B)  The code fragment has a syntax error and does not compile. 
C)  The code fragment does not compile because the parameter variable is not initialized. 
D)  1000.0

Question 6

What is the return type of the println method of the PrintStream class?

Accepted Answer

A)  void 
B)  public 
C)  String 
D)  double 
A)  void 
B)  public 
C)  String 
D)  double

Question 7

You should provide documentation comments for ___.

Accepted Answer

A)  only classes 
B)  only methods with parameters 
C)  every class, every method, every parameter, and every return value 
D)  only methods with return values 
A)  only classes 
B)  only methods with parameters 
C)  every class, every method, every parameter, and every return value 
D)  only methods with return values

Question 8

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 9

Consider the following code to declare a constructor for the Player class: public void Player(String playerName)
{
Name = playerName;
}
Which statement is true?

Accepted Answer

A)  The code compiles successfully and results in the instantiation of a Player object when called. 
B)  The code compiles successfully but results in a compiler error in the code that calls the constructor. 
C)  The code does not compile. 
D)  The code compiles successfully but results in a run-time error in the code that calls the constructor. 
A)  The code compiles successfully and results in the instantiation of a Player object when called. 
B)  The code compiles successfully but results in a compiler error in the code that calls the constructor. 
C)  The code does not compile. 
D)  The code compiles successfully but results in a run-time error in the code that calls the constructor.

Question 10

Which statement is true about the following constructor of the BankAccount class? public BankAccount(double balance)
{
This.balance = balance;
}

Accepted Answer

A)  The code has a syntax error. 
B)  The code has a logic error. 
C)  You can't have an instance variable and a parameter variable with the same name. 
D)  The code sets the instance variable balance to the parameter variable balance. 
A)  The code has a syntax error. 
B)  The code has a logic error. 
C)  You can't have an instance variable and a parameter variable with the same name. 
D)  The code sets the instance variable balance to the parameter variable balance.

Question 11

When drawing complex shapes, provide a(n) ____ to set the position of the shape.

Accepted Answer

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

Question 12

Which of the following statements is true about constructors?

Accepted Answer

A)  Providing a constructor for a class is optional. 
B)  You can only provide one constructor for a class. 
C)  The body of the constructor must initialize all instance variables or the constructor will not successfully compile. 
D)  A constructor has a void return type. 
A)  Providing a constructor for a class is optional. 
B)  You can only provide one constructor for a class. 
C)  The body of the constructor must initialize all instance variables or the constructor will not successfully compile. 
D)  A constructor has a void return type.

Question 13

Which of the following corresponds to the getArea method body for a Square class where the instance variable is named sideLength?

Accepted Answer

A)  return sideLength; 
B)  return area; 
C)  return width * height; 
D)  return sideLength * sideLength; 
A)  return sideLength; 
B)  return area; 
C)  return width * height; 
D)  return sideLength * sideLength;

Question 14

Which of the following corresponds to a valid constructor header for the Player class?

Accepted Answer

A)  public Player() 
B)  private Player 
C)  public void Player() 
D)  private void Player() 
A)  public Player() 
B)  private Player 
C)  public void Player() 
D)  private void Player()

Question 15

What is the name of the local variable of the giveChange method of the CashRegister class?

Accepted Answer

A)  amount 
B)  change 
C)  payment 
D)  purchase 
A)  amount 
B)  change 
C)  payment 
D)  purchase

Question 16

Each object of a class has its own set of ___.

Accepted Answer

A)  methods 
B)  instance variables 
C)  constructors 
D)  classes 
A)  methods 
B)  instance variables 
C)  constructors 
D)  classes

Question 17

What will be output from the following statements that use BankAccount class? BankAccount first = new BankAccount (100);
First.deposit (50.0);
BankAccount second = new BankAccount (first.getBalance());
First.deposit (50.0);
BankAccount third = new BankAccount (first.getBalance());
First.deposit (50.0);
System.out.println (first.getBalance() + " "
+ second.getBalance() + third.getBalance());

Accepted Answer

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

Question 18

What contains the instructions to initialize the instance variables of an object?

Accepted Answer

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

Question 19

What do instance variables belong to?

Accepted Answer

A)  an object 
B)  a class 
C)  a method 
D)  a package 
A)  an object 
B)  a class 
C)  a method 
D)  a package

Question 20

Consider the following method comment and method header: /**
Converts from a source measurement to a target measurement.
@param _______________ the measurement
@return the input value converted to the target unit
*/
Public double convertTo(double fromMeasurement) { . . . }
Fill in the blank.

Accepted Answer

A)  return 
B)  fromMeasurement 
C)  double 
D)  convertTo 
A)  return 
B)  fromMeasurement 
C)  double 
D)  convertTo

Exam 3: Implementing Classes

Instance variables that are numbers are initialized to what default value?

A class declaration consists of which of the following parts?

What is the name of the constructor for the BankAccount class?

What is the return type of the println method of the PrintStream class?

You should provide documentation comments for ___.

When are instance variables initialized?

Consider the following code to declare a constructor for the Player class: public void Player(String playerName) { Name = playerName; } Which statement is true?

Which statement is true about the following constructor of the BankAccount class? public BankAccount(double balance) { This.balance = balance; }

When drawing complex shapes, provide a(n) ____ to set the position of the shape.

Which of the following statements is true about constructors?

Which of the following corresponds to the getArea method body for a Square class where the instance variable is named sideLength?

Which of the following corresponds to a valid constructor header for the Player class?

What is the name of the local variable of the giveChange method of the CashRegister class?

Each object of a class has its own set of ___.

What contains the instructions to initialize the instance variables of an object?

What do instance variables belong to?

Consider the following method comment and method header: /** Converts from a source measurement to a target measurement. @param _______________ the measurement @return the input value converted to the target unit */ Public double convertTo(double fromMeasurement) { . . . } Fill in the blank.

Introduction

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Object-Oriented Design

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