Question 1

Consider the following code snippet:
Public class Employee
{
Private String empName;
) . .
}
Which of the following statements is correct?

Accepted Answer

A)  The empName variable can be accessed by any user of an Employee object. 
B)  The empName variable can be accessed only by methods of the Employee class. 
C)  The empName variable can be accessed only by methods of another class. 
D)  The empName variable cannot be accessed at all because it is private. 
A)  The empName variable can be accessed by any user of an Employee object. 
B)  The empName variable can be accessed only by methods of the Employee class. 
C)  The empName variable can be accessed only by methods of another class. 
D)  The empName variable cannot be accessed at all because it is private.

Question 2

Consider the following code snippet:
Public class Vehicle
{
Private String type;
Private int numAxles;
Public Vehicle(String vehicleType, int VehicleAxles)
{ ) . . }
}
Which of the following statements can be used to create an object of type Vehicle?

Accepted Answer

A)  Vehicle anAuto = new Vehicle(); 
B)  Vehicle anAuto = new Vehicle(2, "SUV"); 
C)  Vehicle anAuto = new Vehicle("SUV", "2"); 
D)  Vehicle anAuto = new Vehicle("SUV", 2); 
A)  Vehicle anAuto = new Vehicle(); 
B)  Vehicle anAuto = new Vehicle(2, "SUV"); 
C)  Vehicle anAuto = new Vehicle("SUV", "2"); 
D)  Vehicle anAuto = new Vehicle("SUV", 2);

Question 3

You have created an Employee class. You wish to have a unique, sequential employee number assigned to each new Employee object that is created. Which of the following declarations, if added to the Employee class, would allow you to determine which number was last assigned when you are creating a new Employee object?

Accepted Answer

A)  private static int lastAssignedEmpNum = 500; 
B)  public int lastAssignedEmpNum = 500; 
C)  private int lastAssignedEmpNum = 500; 
D)  public static int lastAssignedEmpNum = 500; 
A)  private static int lastAssignedEmpNum = 500; 
B)  public int lastAssignedEmpNum = 500; 
C)  private int lastAssignedEmpNum = 500; 
D)  public static int lastAssignedEmpNum = 500;

Question 4

Consider the following code snippet:
Public class Vehicle
{
Private String type;
Private int numAxles;
Public Vehicle()
{
}
) . .
}
Which statement reflects the action performed when the constructor to Vehicle is called?

Accepted Answer

A)  The variable type will be initialized to "" and the variable numAxles will be initialized to 0. 
B)  The variable type will be initialized to "null" and the variable numAxles will be initialized to 0. 
C)  The variable type will not be initialized but the variable numAxles will be initialized to 0. 
D)  The variable type will be initialized to null and the variable numAxles will be initialized to 0. 
A)  The variable type will be initialized to "" and the variable numAxles will be initialized to 0. 
B)  The variable type will be initialized to "null" and the variable numAxles will be initialized to 0. 
C)  The variable type will not be initialized but the variable numAxles will be initialized to 0. 
D)  The variable type will be initialized to null and the variable numAxles will be initialized to 0.

Question 5

Consider the following code snippet:
Public class Vehicle
{
Private String type;
Private int numAxles;
Public void Vehicle(String vehicleType, int VehicleAxles)
{ ) . . }
}
What is wrong with this code?

Accepted Answer

A)  There must be a default constructor with no arguments. 
B)  The class instance variables must be initialized in the declaration statements. 
C)  The constructor declaration must have a return type of String. 
D)  The constructor declaration must not have any return type. 
A)  There must be a default constructor with no arguments. 
B)  The class instance variables must be initialized in the declaration statements. 
C)  The constructor declaration must have a return type of String. 
D)  The constructor declaration must not have any return type.

Question 6

Consider the following code snippet:
Public class Coin
{
Private String coinName;
) . .
}
Which of the following statements is correct?

Accepted Answer

A)  The coinName variable can be accessed by any user of a Coin object. 
B)  The coinName variable can be accessed only by methods of the Coin class. 
C)  The coinName variable can be accessed only by methods of another class. 
D)  The coinName variable cannot be accessed at all because it is private. 
A)  The coinName variable can be accessed by any user of a Coin object. 
B)  The coinName variable can be accessed only by methods of the Coin class. 
C)  The coinName variable can be accessed only by methods of another class. 
D)  The coinName variable cannot be accessed at all because it is private.

Question 7

What type of method does NOT operate on an object?

Accepted Answer

A)  private 
B)  static 
C)  final 
D)  instance 
A)  private 
B)  static 
C)  final 
D)  instance

Question 8

A method in a class that modifies information about an object is called a/an ____ method.

Accepted Answer

A)  mutator 
B)  accessor 
C)  void 
D)  constructor 
A)  mutator 
B)  accessor 
C)  void 
D)  constructor

Question 9

Consider the following code snippet:
Public static class Triangle
{
Public static double getTriangleArea(double heightLen, double baseLen)
{ ) . . }
}
You are writing a program that needs to use this method. Which of the following statements correctly calls this method?

Accepted Answer

A)  Triangle myTriangle = new Triangle();
Double area = myTriangle.getTriangleArea(4.0,7.0); 
B)  double area = new Triangle().getTriangleArea(4.0,7.0); 
C)  double area = Triangle.getTriangleArea(4.0, 7.0); 
D)  This method cannot be used outside of the Triangle class. 
A)  Triangle myTriangle = new Triangle();
Double area = myTriangle.getTriangleArea(4.0,7.0); 
B)  double area = new Triangle().getTriangleArea(4.0,7.0); 
C)  double area = Triangle.getTriangleArea(4.0, 7.0); 
D)  This method cannot be used outside of the Triangle class.

Question 10

Consider the following code snippet:
Public class BankAccount
{
Private int transactionCount;
Private double balance;
) . .
}
Which of the following deposit methods would correctly track how many deposits occurred?

Accepted Answer

A)  public void deposit(double amount)
{
Balance = balance + amount;
} 
B)  public void deposit(double amount)
{
Balance = balance + amount;
TransactionCount ++;
} 
C)  public void deposit(double amount)
{
Balance = balance + amount;
TransactionCount = transactionCount + amount;
} 
D)  public void deposit(double amount)
{
Balance = transactionCount + amount;
} 
A)  public void deposit(double amount)
{
Balance = balance + amount;
} 
B)  public void deposit(double amount)
{
Balance = balance + amount;
TransactionCount ++;
} 
C)  public void deposit(double amount)
{
Balance = balance + amount;
TransactionCount = transactionCount + amount;
} 
D)  public void deposit(double amount)
{
Balance = transactionCount + amount;
}

Question 11

You have created a Student class. You wish to have a unique, sequential student number assigned to each new Student object that is created. Which of the following declarations, if added to the Student class, would allow you to determine which number was last assigned when you are creating a new Student object?

Accepted Answer

A)  private static int lastAssignedStudentNum = 1500; 
B)  public int lastAssignedStudentNum = 1500; 
C)  private int lastAssignedStudentNum = 1500; 
D)  public static int lastAssignedStudentNum = 1500; 
A)  private static int lastAssignedStudentNum = 1500; 
B)  public int lastAssignedStudentNum = 1500; 
C)  private int lastAssignedStudentNum = 1500; 
D)  public static int lastAssignedStudentNum = 1500;

Question 12

Consider the following class:
Public class Auto
{
Private String make;
Private String model;
Private String year;
Public Auto(String aMake, String aModel, String aYear)
{
Make = aMake;
Model = aModel;
Year = aYear;
}
Public String getInfo()
{
Return year + " " + make + " " + model;
}
}
Which of the following code snippets will correctly create an object of this class and display its information?

Accepted Answer

A)  myAuto = new Auto();
System.out.println(myAuto.getInfo()); 
B)  Auto myAuto = new Auto();
System.out.println(myAuto.getInfo()); 
C)  Auto myAuto = new Auto("Ford", "Focus", "2011");
System.out.println(myAuto.getInfo()); 
D)  Auto myAuto = new Auto("2011", "Ford", "Focus");
System.out.println(myAuto.getInfo()); 
A)  myAuto = new Auto();
System.out.println(myAuto.getInfo()); 
B)  Auto myAuto = new Auto();
System.out.println(myAuto.getInfo()); 
C)  Auto myAuto = new Auto("Ford", "Focus", "2011");
System.out.println(myAuto.getInfo()); 
D)  Auto myAuto = new Auto("2011", "Ford", "Focus");
System.out.println(myAuto.getInfo());

Question 13

You have created a Rocket class which has a constructor with no parameters. Which of the following statements will construct an object of this class?

Accepted Answer

A)  Rocket myRocket; 
B)  Rocket myRocket = new Rocket(); 
C)  myRocket.new(Rocket); 
D)  Rocket.new(myRocket); 
A)  Rocket myRocket; 
B)  Rocket myRocket = new Rocket(); 
C)  myRocket.new(Rocket); 
D)  Rocket.new(myRocket);

Question 14

Consider the following code snippet:
Public class Coin
{
Private String coinName;
Private int coinValue;
Public Coin()
{
}
) . .
}
Which statement reflects the action performed when the constructor to Coin is called?

Accepted Answer

A)  The variable coinName will be initialized to "" and the variable coinValue will be initialized to 0. 
B)  The variable coinName will be initialized to "null" and the variable coinValue will be initialized to 0. 
C)  The variable coinName will not be initialized but the variable coinValue will be initialized to 0. 
D)  The variable coinName will be initialized to null and the variable coinValue will be initialized to 0. 
A)  The variable coinName will be initialized to "" and the variable coinValue will be initialized to 0. 
B)  The variable coinName will be initialized to "null" and the variable coinValue will be initialized to 0. 
C)  The variable coinName will not be initialized but the variable coinValue will be initialized to 0. 
D)  The variable coinName will be initialized to null and the variable coinValue will be initialized to 0.

Question 15

Consider the following code snippet:
Public class Coin
{
) . .
Public void setCoinName(String name)
{) . . }
Public String getCoinName()
{) . . }
Public String getCoinValue()
{) . . }
}
Assuming that the names of the methods reflect their action, which of the following statements about this class is correct?

Accepted Answer

A)  setCoinName is an accessor method. 
B)  setCoinName is a mutator method. 
C)  getCoinName is a mutator method. 
D)  getCoinValue is a mutator method. 
A)  setCoinName is an accessor method. 
B)  setCoinName is a mutator method. 
C)  getCoinName is a mutator method. 
D)  getCoinValue is a mutator method.

Question 16

Insert the missing code in the following code fragment. This fragment is intended to implement a method to increase the speed of the motor by one step if possible.
Public class Motor
{
Public static final STOPPED = 0;
Public static final SLOW = 1;
Public static final MEDIUM = 2;
Public static final FAST = 3;
Private int motorSpeed;
) . .
Public void increaseMotorSpeed()
{
If(motorSpeed < FAST)
{
________
}
}
}

Accepted Answer

A)  motorSpeed ++; 
B)  motorSpeed = SLOW; 
C)  motorSpeed = MEDIUM; 
D)  motorSpeed = FAST; 
A)  motorSpeed ++; 
B)  motorSpeed = SLOW; 
C)  motorSpeed = MEDIUM; 
D)  motorSpeed = FAST;

Question 17

Which of the following statements about objects is correct?

Accepted Answer

A)  An object defines only the methods for a class. 
B)  Every object has its own set of data and a set of methods to manipulate the data. 
C)  An object is a sequence of instructions that performs a task. 
D)  All entities, even numbers, are objects. 
A)  An object defines only the methods for a class. 
B)  Every object has its own set of data and a set of methods to manipulate the data. 
C)  An object is a sequence of instructions that performs a task. 
D)  All entities, even numbers, are objects.

Question 18

You are creating a class named Employee. Which statement correctly declares a constructor for this class?

Accepted Answer

A)  public Employee() 
B)  public void Employee() 
C)  void Employee() 
D)  new Employee() 
A)  public Employee() 
B)  public void Employee() 
C)  void Employee() 
D)  new Employee()

Question 19

Consider the following code snippet:
Public class Coin
{
Private String coinName;
Public String getCoinValue()
{ ) . . }
}
Which of the following statements is correct?

Accepted Answer

A)  The getCoinValue method can be accessed by any user of a Coin object. 
B)  The getCoinValue method can be accessed only by methods of the Coin class. 
C)  The getCoinValue method can be accessed only by methods of another class. 
D)  The getCoinValue method cannot be accessed at all. 
A)  The getCoinValue method can be accessed by any user of a Coin object. 
B)  The getCoinValue method can be accessed only by methods of the Coin class. 
C)  The getCoinValue method can be accessed only by methods of another class. 
D)  The getCoinValue method cannot be accessed at all.

Question 20

Insert the missing code in the following code fragment. This fragment is intended to implement a method to set the state of the object.
Public class Motor
{
Public static final STOPPED = 0;
Public static final PAUSED = 1;
Public static final RUNNING = 2;
Private int motorState;
) . .
Public void stopMotor()
{
________
}
}

Accepted Answer

A)  motorState++; 
B)  motorState = STOPPED; 
C)  motorState = PAUSED; 
D)  motorState = RUNNING; 
A)  motorState++; 
B)  motorState = STOPPED; 
C)  motorState = PAUSED; 
D)  motorState = RUNNING;

Consider the following code snippet: Public class Employee { Private String empName; ) . . } Which of the following statements is correct?

Consider the following code snippet: Public class Vehicle { Private String type; Private int numAxles; Public Vehicle(String vehicleType, int VehicleAxles) { ) . . } } Which of the following statements can be used to create an object of type Vehicle?

Consider the following code snippet: Public class Vehicle { Private String type; Private int numAxles; Public Vehicle() { } ) . . } Which statement reflects the action performed when the constructor to Vehicle is called?

Consider the following code snippet: Public class Vehicle { Private String type; Private int numAxles; Public void Vehicle(String vehicleType, int VehicleAxles) { ) . . } } What is wrong with this code?

Consider the following code snippet: Public class Coin { Private String coinName; ) . . } Which of the following statements is correct?

What type of method does NOT operate on an object?

A method in a class that modifies information about an object is called a/an ____ method.

Consider the following code snippet: Public static class Triangle { Public static double getTriangleArea(double heightLen, double baseLen) { ) . . } } You are writing a program that needs to use this method. Which of the following statements correctly calls this method?

Consider the following code snippet: Public class BankAccount { Private int transactionCount; Private double balance; ) . . } Which of the following deposit methods would correctly track how many deposits occurred?

You have created a Rocket class which has a constructor with no parameters. Which of the following statements will construct an object of this class?

Consider the following code snippet: Public class Coin { Private String coinName; Private int coinValue; Public Coin() { } ) . . } Which statement reflects the action performed when the constructor to Coin is called?

Which of the following statements about objects is correct?

You are creating a class named Employee. Which statement correctly declares a constructor for this class?

Consider the following code snippet: Public class Coin { Private String coinName; Public String getCoinValue() { ) . . } } Which of the following statements is correct?

Introduction

Fundamental Data Types

Decisionseasy

Loops

Methods

Arrays and Arraylists

Inputoutput and Exception Handling

Inheritance and Interfaces

Graphical User Interfaces

Advanced User Interfaces

Object-Oriented Design

Recursion

Sorting and Searching

The Java Collections Framework

Basic Data Structures

Tree Structures

Generic Classes

Streams and Binary Inputoutput

Multithreading

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Relational Databases

XML

Web Applications

Filters

Exam 8: Objects and Classes

Consider the following code snippet: Public class Employee { Private String empName; ) . . } Which of the following statements is correct?

Consider the following code snippet: Public class Vehicle { Private String type; Private int numAxles; Public Vehicle(String vehicleType, int VehicleAxles) { ) . . } } Which of the following statements can be used to create an object of type Vehicle?

Consider the following code snippet: Public class Vehicle { Private String type; Private int numAxles; Public Vehicle() { } ) . . } Which statement reflects the action performed when the constructor to Vehicle is called?

Consider the following code snippet: Public class Vehicle { Private String type; Private int numAxles; Public void Vehicle(String vehicleType, int VehicleAxles) { ) . . } } What is wrong with this code?

Consider the following code snippet: Public class Coin { Private String coinName; ) . . } Which of the following statements is correct?

What type of method does NOT operate on an object?

A method in a class that modifies information about an object is called a/an ____ method.

Consider the following code snippet: Public static class Triangle { Public static double getTriangleArea(double heightLen, double baseLen) { ) . . } } You are writing a program that needs to use this method. Which of the following statements correctly calls this method?

Consider the following code snippet: Public class BankAccount { Private int transactionCount; Private double balance; ) . . } Which of the following deposit methods would correctly track how many deposits occurred?

You have created a Rocket class which has a constructor with no parameters. Which of the following statements will construct an object of this class?

Consider the following code snippet: Public class Coin { Private String coinName; Private int coinValue; Public Coin() { } ) . . } Which statement reflects the action performed when the constructor to Coin is called?

Which of the following statements about objects is correct?

You are creating a class named Employee. Which statement correctly declares a constructor for this class?

Consider the following code snippet: Public class Coin { Private String coinName; Public String getCoinValue() { ) . . } } Which of the following statements is correct?

Introduction

Fundamental Data Types

Decisionseasy

Loops

Methods

Arrays and Arraylists

Inputoutput and Exception Handling

Inheritance and Interfaces

Graphical User Interfaces

Advanced User Interfaces

Object-Oriented Design

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

Filters