Object-Oriented Programming Exam Bank
Course Introduction
Object-Oriented Programming is a foundational course that introduces students to the principles and techniques of organizing software using objects, classes, inheritance, encapsulation, and polymorphism. Through a combination of lectures, hands-on projects, and coding exercises, students learn to model real-world problems by designing reusable and maintainable code structures. The course emphasizes the development of problem-solving skills and best practices in programming using an object-oriented language, preparing students for advanced topics in software development and engineering.
Recommended Textbook
Big Java Late Objects 1st Edition by Cay S. Horstmann
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Chapter 1: Introduction
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Sample Questions
Q1) These two lines of code do not produce the same output. Why?
System.out.println(7 + 3); System.out.println("7 + 3");
A) Arithmetic calculations cannot take place within the println method call.
B) In fact, the two statements do produce the same output.
C) The quotes cause the second expression to be treated as a string.
D) Because there are no escape characters.
Answer: C
Q2) Consider the following statements about folders and your integrated development environment (IDE):
I. Hierarchical folders help to organize a project.
II. Folders are a way to visualize the layout of a file system.
III. Folders make it impossible to lose or accidentally delete a file.
A) Only I is correct
B) I, II, and III are correct
C) Only I and II are correct
D) Only III is correct
Answer: C
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Chapter 2: Fundamental Data Types
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Sample Questions
Q1) Which of the following statements places input into the variable value given this line of code?
Scanner in = new Scanner(System.in);
A) int value = in();
B) int value = in.nextInt();
C) int value = in.next();
D) int value = in.nextFloat();
Answer: B
Q2) Which one of the following statements can be used to convert a string str to a double?
A) double n = str.parseDouble();
B) double n = Integer.parseDouble(str);
C) double n = Double.parseDouble(str);
D) double n = double.parseDouble(str);
Answer: C
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4
Chapter 3: Decisionseasy
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Sample Questions
Q1) What is the value of the cost variable after the following code snippet is executed?
Int cost = 82;
If (cost < 100)
Cost = cost + 10;
If (cost > 50)
Cost = cost * 2;
If (cost < 100)
Cost = cost - 20;
A) 82 B) 92
C) 184
D) 164
Answer: C
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Page 5
Chapter 4: Loops
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Sample Questions
Q1) Insert a statement that will correctly terminate this loop when the end of input is reached.
Boolean done = false; While (!done)
{ String input = in.next(); If (input.equalsIgnoreCase("Q"))
{ } Else
{ Double x = Double.parseDouble(input); Data.add(x);
}
}
A) stop; B) done = 1; C) exit;
D) done = true;
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Page 6
Chapter 5: Methods
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Sample Questions
Q1) For a program that reads three letter grades and calculates an average of those grades, which of the following would be a good design based on stepwise refinement?
A) Write one method that reads three letter grades, converts each letter grade to a number, and calculates the average of the three numbers.
B) Write one method that reads three letter grades, and a second method to convert each letter to a number and calculate the average of the three numbers.
C) Write one method that reads a letter grade and returns the number equivalent, and one method that computes the average of three numbers.
D) Stepwise refinement cannot be applied to this problem.
Q2) The term "Black Box" is used with methods because
A) Only the implementation matters; the specification is not important.
B) Only the specification matters; the implementation is not important.
C) Only the arguments matter; the return value is not important.
D) Only the return value matters; the arguments are not important.
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Chapter 6: Arrays and Arraylists
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Sample Questions
Q1) Consider the following code snippet, where the array lists contain elements that are stored in ascending order:
ArrayList<Integer> list1 = new ArrayList<Integer>(); ArrayList<Integer> list2 = new ArrayList<Integer>();
) . .
Int count = 0;
For (int i = 0; i < list1.size() && i < list2.size(); i++)
{ If (list1.get(i) == list2.get(i))
{ Count++;
Which one of the following descriptions is correct for the given code snippet?
A) The code snippet finds the highest value out of the two array lists.
B) The code snippet finds the lowest value out of the two array lists.
C) The code snippet compares the values of two array lists and stores the count of total matches found.
D) The code snippet adds the values of the two array lists.
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Chapter 7: Inputoutput and Exception Handling
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Sample Questions
Q1) Consider the following code snippet: Throw IllegalStateException("This operation is not allowed!");
Which of the following statements about this code is correct?
A) This code constructs an object of type IllegalArgumentException and throws the object.
B) This code throws an existing IllegalArgumentException object.
C) This code constructs an object of type IllegalArgumentException and reserves it for future use.
D) This code will not compile.
Q2) Consider the following code snippet: PrintWriter out = new PrintWriter("output.txt");
Which of the following statements about the PrintWriter object is correct?
A) If a file named "output.txt" already exists, an exception will occur.
B) If a file named "output.txt" already exists, data will be added at the end of the file.
C) If a file named "output.txt" already exists, existing data will be deleted before data are added to the file.
D) If a file named "output.txt" already exists, a new file named "output_1.txt" will be created and used.
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Chapter 8: Objects and Classes
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Sample Questions
Q1) Which of the following statements about constructors is NOT correct?
A) A constructor must have the same name as the class name.
B) A call to a constructor must always have construction parameters.
C) A constructor initializes the instance variables of an object.
D) A class can have more than one constructor.
Q2) If you do not provide a constructor in a class, which of the following is correct?
A) The compiler will generate a constructor with arguments for each class instance variable and will initialize all of the class instance variables.
B) The compiler will generate a constructor with no arguments.
C) The compiler will generate a constructor with arguments for each class instance variable.
D) The class code will not compile.
Q3) Which of the following declares a rpmRating instance variable for a Motor class that stores an integer value?
A) private integer rpmRating;
B) private int rpmRating;
C) public integer rpmRating;
D) public int rpmRating;
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Chapter 9: Inheritance and Interfaces
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Sample Questions
Q1) Consider the following code snippet: Int vacationDays = 10;
String output = "Number of earned vacation days is " + vacationDays; Which of the following statements is correct?
A) The toString method of the Object class is being used to set the value of output.
B) The toString method of the Integer class is being used to set the value of output.
C) No toString method is being used to set the value of output.
D) This code will not compile.
Q2) Which of the following is true regarding inheritance?
A) When creating a subclass, all methods of the superclass must be overridden.
B) When creating a subclass, no methods of a superclass can be overridden.
C) A superclass can force a programmer to override a method in any subclass created from it.
D) A superclass cannot prevent a programmer from overriding a method in any subclass created from it.
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Chapter 10: Graphical User Interfaces
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Sample Questions
Q1) Which of the following statements about listener classes is true?
A) A listener class can be declared as an anonymous inner class.
B) A listener class cannot be declared as an inner class.
C) A listener class must be declared as an inner class.
D) A listener class must be declared as an anonymous inner class.
Q2) User-interface components are arranged by placing them inside ____________________.
A) Swing components
B) borders
C) JPanels
D) containers
Q3) The methods of a/an ____ describe the actions to be taken when an event occurs.
A) event source
B) event listener
C) event interface
D) action source
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Chapter 11: Advanced User Interfaces
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Sample Questions
Q1) What is the container for top-level menu items?
A) menu bar
B) menu item
C) menu GUI
D) top level menus don't use containers
Q2) What is the default layout manager of the content pane of a JFrame?
A) FlowLayout
B) GridLayout
C) BoxLayout
D) BorderLayout
Q3) What features do GUI builders have to speed the development of the graphical user interface of the program?
I setting properties of dialog boxes
II automated event-handling code generation
III drag and drop of visual components
A) I
B) II
C) II and III
D) I, II and III
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Page 13
Chapter 12: Object-Oriented Design
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Sample Questions
Q1) Which of the following statements is correct?
A) Dependency is a stronger form of aggregation.
B) Aggregation indicates high cohesiveness.
C) Aggregation indicates low coupling.
D) Aggregation is a stronger form of dependency.
Q2) Which of the following code snippets denotes that the Fleet class aggregates the Taxi class?
A) public class Fleet extends Taxi
B) public class Taxi extends Fleet
C) public class Fleet
{ Private ArrayList<Taxi> taxicabs; }
D) public class Taxi
{ Private Fleet myFleet;
}
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Chapter 13: Recursion
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Sample Questions
Q1) ____ is a problem-solving technique that examines partial solutions, abandons unsuitable ones, and returns to consider other candidate solutions.
A) Debugging
B) Traceback
C) Backtracking
D) Recursion
Q2) Which statement(s) about recursion are true?
I Recursion is faster than iteration
II Recursion is often easier to understand than iteration
III Recursive design has an economy of thought
A) I
B) II
C) II and III
D) I and III
Q3) In recursion, the non-recursive case is analogous to a loop ____.
A) call
B) iteration
C) termination
D) condition
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Page 15
Chapter 14: Sorting and Searching
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Sample Questions
Q1) Which of the following statements about running times of algorithms is correct?
A) An algorithm that is O(1) means that only one comparison takes place.
B) When determining the running time, constants are not taken into consideration.
C) When determining the running time, lower-order terms must be taken into consideration.
D) An algorithm that is O(n) means that the number of comparisons does not grow as the size of the array increases.
Q2) If you implement a recursive linear search, its performance will be ____.
A) O(n)
B) O(n<sup>2</sup>)
C) O(log (n))
D) O(n log (n))
Q3) After one iteration of selection sort working on an array of 10 elements, what must hold true?
A) The array cannot be sorted.
B) One element must be correctly placed.
C) At least two elements are correctly placed.
D) The largest element is correctly placed.
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Chapter 15: The Java Collections Framework
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Sample Questions
Q1) A linear search only requires ____ access.
A) sequential
B) random
C) sorted
D) arbitrary
Q2) Which method is NOT part of the ListIterator interface?
A) delete
B) add
C) next
D) previous
Q3) Assume you have created a linked list named myList that currently holds some number of String objects. Which of the following statements correctly adds a new element to the beginning of myList?
A) myList.addFirst("Harry");
B) myList.add("Harry");
C) myList.insert("Harry");
D) myList.put("Harry");
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17
Chapter 16: Basic Data Structures
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Sample Questions
Q1) Consider the following code snippet: LinkedList<String> words = new LinkedList<String>(); Words.addFirst("123"); Words.addLast("456"); Words.addFirst("789"); System.out.print(words.removeLast()); System.out.print(words.removeFirst()); System.out.print(words.removeLast());
What does this code print?
A) 123456789
B) 789123456
C) 123789456
D) 456789123
Q2) Which Java package contains the LinkedList class?
A) java.lang
B) java.util
C) java.collections
D) java.io
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18
Chapter 17: Tree Structures
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Sample Questions
Q1) Which of the following may occur as a result of an add operation, on a non-empty binary search tree?
I a new root is created
II the new node becomes the left child of the root
III the new node has a right child upon insertion
A) I
B) II
C) III
D) II and III
Q2) If the postorder traversal of an expression tree is 8, 2, +, 5, /, what is the preorder traversal?
A) +, /, 8, 2, 5
B) /, +, 8, 2, 5
C) 8, +, 2, /, 5
D) /, +, 2, 8, 5
Q3) Removing an element from a balanced binary search tree takes ____ time.
A) O(n)
B) O(log (n))
C) O(1)
D) O(n<sup>2</sup>)
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Chapter 18: Generic Classes
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Sample Questions
Q1) Determine the correctness of the MyLinkedList generic class code below.
Public class MyLinkedList<E>
{
Private MyNode first;
Public E getFirst() { return first.data; }
Private class MyNode
{
Private E data;
Private MyNode next; } }
A) MyNode cannot refer to type variable E
B) first.data will cause a compiler error
C) the inner class MyNode cannot be private
D) the code is correct
Q2) Which of the following satisfies the wildcard ? super Object?
A) String
B) JComponent
C) Scanner
D) none satisfy this wildcard
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Page 20
Chapter 19: Streams and Binary Inputoutput
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Sample Questions
Q1) You use _________ and FileOutputStream objects to write data to a disk file in text or binary form respectively.
A) FileReader
B) PrintWriter
C) OutputStreamWriter
D) ObjectOutputStream
Q2) What is the highest value for a signed (negative and positive) byte?
A) 127
B) 128
C) 255
D) 256
Q3) If you want to process text data from a file, which keyword do you look for in classes that specialize in doing that?
A) text
B) serializable
C) binary
D) reader
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21
Chapter 20: Multithreading
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Sample Questions
Q1) A(n) ____ object is used to control the threads that want to manipulate a shared resource.
A) condition
B) lock
C) interrupt
D) runnable
Q2) A waiting thread is blocked until another thread calls ____ on the condition object for which the thread is waiting.
A) await
B) signalAll
C) interrupt
D) lock
Q3) The ________ method is called by a thread that has just changed the state of some shared data in a way that may benefit waiting threads.
A) run
B) lock
C) unlock
D) signalAll
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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) A(n) ____ describes how data for a particular application is transmitted.
A) URL
B) application protocol
C) socket
D) IP address
Q3) For the server to execute the run method in a separate thread for each client, the application program needs to implement the _____ interface.
A) Running
B) Runtime
C) Server
D) Runnable
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Chapter 22: Relational Databases
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Sample Questions
Q1) If you encounter an error during updating a transaction, then call the ______ method:
A) undo
B) takeback
C) rollaround
D) rollback
Q2) What does the execute method return?
A) ResultSet
B) Query
C) RecordSet
D) boolean
Q3) Apache Derby is an example of a:
A) Heavyweight Java database.
B) Lightweight Java database.
C) Desktop database.
D) Production-quality database.
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Page 24
Chapter 23: XML
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Sample Questions
Q1) What method do you use to insert a node into an XML document?
A) insertNode method.
B) createNode method.
C) createElement method.
D) insertElement method.
Q2) What package will you use to import DocumentBuilder?
A) javax.swing.DocumentBuilder
B) javax.xml.DocumentBuilder
C) javax.parsers.DocumentBuilder
D) javax.xml.parsers.DocumentBuilder
Q3) The ____ standard defines interfaces and methods to analyze and modify the tree structure that represents an XML document.
A) JAXP
B) SAX
C) DOM
D) API
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Chapter 24: Web Applications
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Sample Questions
Q1) The JSF technology enables the separation of :
A) HTML and Swing.
B) presentation and application.
C) business logic and presentation.
D) JSF and HTML.
Q2) JSF pages define the ___________ of a web application.
A) swings
B) presentation logic
C) business logic
D) value expressions
Q3) What does the value expression timeZoneBean.city do when it is part of the JSF tag <h:inputText value="#{timeZoneBean.city}"/>?
A) Sets the timeBean.city instance variable.
B) Calls the timeBean.setTime method
C) Calls the timeBean.setTime method method
D) Calls either the timeBean.setTime or timeBean.setTime method
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