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Object-Oriented Programming Final

Exam

Course Introduction

Object-Oriented Programming (OOP) introduces students to the fundamental concepts and practices of software development using the object-oriented paradigm. The course covers key principles such as encapsulation, inheritance, polymorphism, and abstraction, emphasizing how to model real-world problems as objects and classes. Students will learn to design, implement, test, and debug programs in an object-oriented language, understanding how to create modular, reusable, and maintainable code. Through practical assignments and projects, participants will gain hands-on experience with object-oriented design patterns, interfaces, and the effective use of software development tools, laying a strong foundation for advanced programming and application development.

Recommended Textbook

Big Java Late Objects 1st Edition by Cay S. Horstmann

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24 Chapters

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Chapter 1: Introduction

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Sample Questions

Q1) In Java, the statement System.out.print("hello");;;

A) is a syntax error

B) is a legal statement

C) seems like it should print out "hello" but doesn't

D) asks the user to enter a value and stores it in the variable "hello"

Answer: B

Q2) In order to translate a Java program to a class file, the computer needs to have software called a(n):

A) assembler

B) virtual machine

C) compiler

D) debugger

Answer: C

Q3) An example of an input device that interfaces between computers and humans is

A) a microphone

B) a monitor

C) a printer

D) a speaker

Answer: A

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Chapter 2: Fundamental Data Types

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Sample Questions

Q1) What is wrong with the following code snippet? Int average;

Average = 78A;

A) The average variable is never initialized.

B) The data type for the average variable is not specified.

C) The average variable is never assigned a value.

D) The average variable is assigned a non-numeric value.

Answer: D

Q2) What output is produced by these statements?

String name = "Joanne Hunt"; System.out.println(name.length());

A) 8

B) 10

C) 9

D) 11

Answer: D

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Chapter 3: Decisionseasy

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Sample Questions

Q1) When an if statement is nested inside another if statement, it creates the possibility of

A) an infinite loop

B) the misuse of the break statement

C) type mismatch

D) The dangling else

Answer: D

Q2) Which of the following operators is used to invert a conditional statement?

A) !

B) !=

C) ||

D) \(?\)

Answer: A

Q3) Which of the following operators is used as a relational operator?

A) =<

B) <=

C) =

D) !

Answer: B

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Page 5

Chapter 4: Loops

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Sample Questions

Q1) When hand-tracing the loop in the code snippet below, which variables are important to evaluate?

Int i = 10;

Int j = 5;

Int k = -10;

Int sum = 0;

While (i > 0)

{ Sum = sum + i + j;

I--;

System.out.println("Iteration: " + i);

}

A) The variables i and j

B) The variables i and sum

C) The variables i, j, and k

D) The variables j and k

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Chapter 5: Methods

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Sample Questions

Q1) A temporary method that is used to provide a quick way to test other methods is called:

A) Stub

B) Parameter

C) Caller

D) Assessor

Q2) Given the following method, what is the result of getNumber(n)?

Public static double getNumber(double n)

{ Return Math.pow(Math.sqrt(n), 2) - n;

}

A) Always 0 for every argument n

B) Always 2 for every argument n

C) Close to 0, but not always 0

D) Compilation error

Q3) An effective technique for understanding the subtle aspects of a method is to:

A) Perform a manual walkthrough.

B) Write stub methods.

C) Use the Java compiler to catch compile-time errors.

D) Write large methods to eliminate the run-time overhead of calling methods.

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Chapter 6: Arrays and Arraylists

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Sample Questions

Q1) What is the output of the following code snippet?

ArrayList<Integer> num; Num)add(4); System.out.println(num.size());

A) 1

B) 0

C) 4

D) Error because num is not initialized

Q2) Which statements are true regarding the differences between arrays and array lists?

I. Arrays are better if the size of a collection will not change

II. Array lists are more efficient than arrays

III. Array lists are easier to use than arrays

A) I, II

B) I, III

C) II, III

D) I, II, III

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Chapter 7: Inputoutput and Exception Handling

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Sample Questions

Q1) The Scanner class's ____ method is used to specify a pattern for word boundaries when reading text.

A) useDelimiter()

B) usePattern()

C) setDelimiter()

D) setPattern()

Q2) Which of the following statements about using a PrintWriter object is NOT true?

A) A PrintWriter will be automatically closed when the program exits.

B) Data loss may occur if a program fails to close a PrintWriter object before exiting.

C) PrintWriter is an enhancement of the PrintStream class.

D) A program can write to a PrintWriter using println.

Q3) An example of a fatal error that rarely occurs and is beyond your control is the ____.

A) OutOfMemoryError

B) RuntimeException

C) FileNotFoundException

D) NumberFormatException

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Chapter 8: Objects and Classes

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Sample Questions

Q1) You have created a Coin class and a Purse class. Which of the following will correctly allow the Purse class to collect Coin objects?

A) public Purse

{

Private Coin ArrayList coins; }

B) public Purse

{

Private ArrayList coins; }

C) public Purse

{

Private ArrayList<Coin> coins; }

D) public Purse

{

Public ArrayList<Coin> coins; }

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Page 10

Chapter 9: Inheritance and Interfaces

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Sample Questions

Q1) You are creating a Motorcycle class which is supposed to be a subclass of the Vehicle class. Which of the following class declaration statements will accomplish this?

A) public class Motorcycle extends Vehicle

B) public class Motorcycle implements Vehicle

C) public class Motorcycle interfaces Vehicle

D) public class Motorcycle inherits Vehicle

Q2) To ensure that an instance variable can only be accessed by the class that declared it, the variable should be declared as ____.

A) public

B) private

C) protected

D) final

Q3) Which statement about methods in an interface is true?

A) All methods in an interface are automatically private.

B) All methods in an interface are automatically public.

C) All methods in an interface are automatically static.

D) All methods in an interface must be explicitly declared as private or public.

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Chapter 10: Graphical User Interfaces

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Sample Questions

Q1) What happens if a text field's width is set to 10 characters and the user types more characters into it?

A) The user interface automatically widens the field's width.

B) An InputMismatchException is thrown.

C) The earlier characters are deleted and only the last ten are shown and entered.

D) The characters are entered but only those that fit into the width are shown.

Q2) Use the ____ method to specify the height and width of a graphical component when you add it to a panel.

A) setPreferredDimensions.

B) setInitialDimensions.

C) setPreferredSize.

D) setInitialSize.

Q3) Which of the following statements creates a button with "Calculate" as its label?

A) Button JButton = new Button("Calculate")

B) button = new Button(JButton, "Calculate")

C) Button = new JButton("Calculate")

D) JButton button = new JButton("Calculate")

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Chapter 11: Advanced User Interfaces

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Sample Questions

Q1) Which component can generate action events?

I JMenuBar

II JMenu

III JMenuItem

A) I

B) II

C) III

D) II and III

Q2) What is the most time-effective way to build a GUI quickly and concentrate on coding the logic of the program?

A) use the GridBagLayout manager

B) use a GUI builder, such as NetBeans

C) use nested panels

D) use menus

Q3) What type of event does the JSlider class generate?

A) ChangeEvent

B) ActionEvent

C) ItemEvent

D) SliderEvent

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Page 13

Chapter 12: Object-Oriented Design

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Sample Questions

Q1) A CashRegister class contains an array list of Coin objects. This is best described as an example of ____.

A) Association

B) Inheritance

C) Cohesiveness

D) Aggregation

Q2) To improve the quality of the public interface of a class, ____.

A) You should maximize cohesion and minimize inheritance.

B) You should minimize cohesion and maximize coupling.

C) You should maximize cohesion and minimize coupling.

D) You should minimize cohesion and maximize aggregation.

Q3) When using the CRC method, other classes that are needed to fulfill the responsibilities of a given class are called its ____.

A) Related classes.

B) Responsible classes.

C) Collaborators.

D) Concurrent classes.

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Chapter 13: Recursion

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Sample Questions

Q1) Consider the following recursive code snippet: Public int mystery(int n, int m)

{ If (n == 0)

{ Return 0; } If (n == 1)

{ Return m; } Return m + mystery(n - 1, m); }

What parameter values for n would cause an infinite recursion problem in the following method?

A) n == 0

B) n == 1

C) all n with n < 0

D) all n with n >= 0

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Page 15

Chapter 14: Sorting and Searching

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Sample Questions

Q1) Given the following code snippet for searching an array:

Int[] arr = {3, 8, 12, 14, 17};

Int newVal = 15;

Int pos = Arrays.binarySearch(arr, newVal);

What value will pos have when this code is executed?

A) 5

B) -5

C) 6

D) -6

Q2) Which of the following classes implement the Comparable interface?

I Date

II Collections

III String

A) I

B) I and II

C) I and III

D) II and III

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Page 16

Chapter 15: The Java Collections Framework

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Sample Questions

Q1) Consider the following code snippet: Map<String, Integer> scores;

If you need to visit the keys in sorted order, which of the following statements will create a structure to support this?

A) scores = new HashMap<String, Integer>;

B) scores = new TreeMap<String, Integer>;

C) scores = new Map<String, Integer>;

D) scores = new HashTable<String, Integer>;

Q2) What is included in a linked list node?

I a reference to its neighboring nodes

II an array reference

III a data element

A) I

B) II

C) II and III

D) I and III

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Chapter 16: Basic Data Structures

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Sample Questions

Q1) If we want a create a doubly-linked list data structure so that we can move from a node to the next node as well as to a previous node we need to add a previous reference to the Node class. Each such DNode (doubly-linked Node) will have a data portion and two DNode references, next and previous. How many references need to be updated when we remove a node from the beginning of a list with many nodes? Consider the first reference and neighboring node(s).

A) 1

B) 2

C) 3

D) 4

Q2) Suppose we maintain a linked list of length n in sorted order. What would be the big-Oh notation for the add operation?

A) O(1)

B) O(n)

C) O(n log2 n)

D) O(n2)

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Chapter 17: Tree Structures

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Sample Questions

Q1) The height h of a completely filled binary tree with n nodes is ____.

A) h = log2(n) - 1

B) h = log2(n) + 1

C) h = log2(n - 1)

D) h = log2(n + 1)

Q2) In a binary search tree, where the root node data value = 45, what do we know about the values of all the descendants in the right subtree of the root?

A) the root's right child value > 45, but the left child of the root's right child key is < 45

B) some values will be > 45, but there may be a few values < 45

C) approximately half the values are < 45, the other half are > 45

D) all will be > 45

Q3) If the child references of a binary tree node are both null, the node is ____.

A) a root node

B) a leaf node

C) a parent node

D) an interior node

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Chapter 18: Generic Classes

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Sample Questions

Q1) Consider the following code snippet:

Public static <T> void fun(T[] t) { . . . }

Erasure by the compiler of method fun will generate which result?

A) public static <T> void fun(Object[] t) { . . . }

B) public static <Object> void fun(Object t) { . . . }

C) public static void fun(Object[] t) { . . . }

D) public static void fun(Object t) { . . . }

Q2) Which of the following statements about the Java virtual machine is correct?

A) The Java virtual machine always replaces type parameters with their upper bounds.

B) The Java virtual machine always replaces type parameters with their lower bounds.

C) The Java virtual machine always replaces type parameters with type Object.

D) The Java virtual machine replaces type parameters with their bounds or with type Object.

Q3) What does it mean when the syntax ? extends D is used?

A) Any superclass of D may be used.

B) Any subclass of D may be used.

C) Any subclass or superclass of D may be used.

D) This indicates a wildcard with an upper bound

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Chapter 19: Streams and Binary Inputoutput

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Sample Questions

Q1) The two IO classes used for serialization are _______ and ________.

A) Reader, Writer

B) ObjectInputStream, ObjectOutputStream

C) Scanner, PrintWriter

D) FileReader, FileWriter

Q2) The ____ class is used when writing text files.

A) PrintWriter

B) InputStream

C) JFileChooser

D) Serializable

Q3) Which is an advantage of storing numbers in binary format?

I fast access

II less storage needed

III easy to read in a text editor

A) I

B) III

C) I and II

D) I and III

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Chapter 20: Multithreading

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Sample Questions

Q1) The ________ method stops the current thread for a given number of milliseconds.

A) run

B) await

C) sleep

D) delay

Q2) Which phrase best describes the purpose of a lock used in an object in one or more of its methods?

A) increased sharing

B) mutual exclusion

C) speed increase

D) privacy protection

Q3) In which method are the tasks that are performed by a thread coded?

A) start

B) main

C) run

D) init

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Page 22

Chapter 21: Internet Networking

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Sample Questions

Q1) The HTTP command POST ____________.

A) returns the requested item.

B) supplies input to a server-side command and returns the result.

C) requests input from the server-side command.

D) supplies input to a client-side command.

Q2) What are among the most important pieces of information that must be included in an IP packet?

I. The Internet address of the recipient

II. The URL of the recipient

III. The Internet address of the sender

IV. The port number of the sender

A) I, III, and IV

B) I, II, and III

C) II, III, and IV

D) I, II, III, and IV

Q3) A(n) ____ is a pointer to an information resource on the World Wide Web.

A) URL

B) socket

C) IP address

D) domain name

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Chapter 22: Relational Databases

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Sample Questions

Q1) The following command will compile a Java program called TestDB:

A) java TestDB.class

B) java TestDB.java

C) javac TestDB.java

D) javac TestDB.class

Q2) What is wrong with the following statement?

Boolean result = statement.execute("SELECT * from emp WHERE empNum = '?'");

A) boolean should be ResultSet

B) execute should be executeQuery

C) execute should be prepareStatement

D) \(?\) should be an integer

Q3) Oracle is an example of a:

A) Heavyweight Java database.

B) Lightweight Java database.

C) Desktop database.

D) Production-quality database.

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Chapter 23: XML

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Sample Questions

Q1) What kind of object do you need to create a new, empty XML document?

A) DocumentBuilder

B) newBuilder

C) newInstance

D) newDocumentBuilder

Q2) Using the grammar notation in your textbook, the expression <article> ::= a | the means:

A) "article must be equal to a and the"

B) "article can be replaced with a or the"

C) "article can be replaced with a and the"

D) "article cannot be equal a or the"

Q3) Which of the following statements is correct?

A) Elements cannot have attributes.

B) An XML document starts out with an HTML declaration and contains elements and text.

C) An element must contain text or elements, not both.

D) An attribute is appropriate only if it tells something about the data but is not part of the data itself.

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Chapter 24: Web Applications

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Sample Questions

Q1) Which of the following statements is correct?

A) A server with a JSF container such as GlassFish manages a pool of database connections.

B) JSF tags use XML syntax but the / before the closing angle bracket is not required.

C) JSF tags are case insensitive.

D) A JSF page cannot contain XML tags.

Q2) In JSF, button groups and ____ require that you specify two properties: the collection of possible choices and the actual choice.

A) menus

B) cookies

C) images

D) text areas

Q3) What does the second period in the following command denote?

Jar cvf time.war .

A) The root directory.

B) The parent directory

C) The current directory

D) The jar command directory

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