Object-Oriented Programming
Exam Answer Key
Course Introduction
Object-Oriented Programming is a foundational course that introduces students to the principles and techniques of developing software using the object-oriented paradigm. Emphasizing concepts such as classes, objects, inheritance, polymorphism, encapsulation, and abstraction, this course equips students with the skills to design and implement robust, modular, and reusable code. Through hands-on practice with an object-oriented programming language, students learn to structure complex programs, solve real-world problems, and develop applications that are easier to maintain and extend. This course provides a crucial understanding of modern software development and prepares students for advanced programming topics.
Recommended Textbook
Starting Out with Java From Control Structures through Data Structures 2nd Edition by Tony Gaddis
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Chapter 1: Introduction to Computers and Java
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Sample Questions
Q1) Syntax is:
A) Words that have a special meaning in the programming language
B) Rules that must be followed when writing a program
C) Punctuation
D) Symbols or words that perform operations
Answer: B
Q2) Colons are used to indicate the end of a Java statement.
A)True
B)False
Answer: False
Q3) This is a special language used to write computer programs.
A) Programming language
B) Operating system
C) Application
D) Pseudocode
Answer: A
Q4) Java source files end with the .class extension.
A)True
B)False
Answer: False
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Chapter 2: Java Fundamentals
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Q1) What will be displayed as a result of executing the following code? int x = 5,y = 20;
X += 32;
Y /= 4;
System.out.println("x = " + x + ",y = " + y);
A) x = 32,y = 4
B) x = 9,y = 52
C) x = 37,y = 5
D) x = 160,y = 80
Answer: C
Q2) Which of the following statements correctly creates a Scanner object for keyboard input?
A) Scanner kbd = new Scanner(System.keyboard);
B) Scanner keyboard(System.in);
C) Scanner keyboard = new Scanner(System.in);
D) Keyboard scanner = new Keyboard(System.in);
Answer: C
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Chapter 3: Decision Structures
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Sample Questions
Q1) What is the value of x after the following code has been executed? int x = 75; Int y = 90; If ( x != y)
X += y;
A) 75
B) 90
C) 15
D) 165 Answer: D
Q2) Because the && operator performs short-circuit evaluation,your boolean expression will usually execute faster if the subexpression that is most likely false is on the left of the && operator.
A)True
B)False Answer: True
Q3) A local variable's scope always ends at the closing brace of the block of code in which it is declared.
A)True
B)False Answer: True
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Chapter 4: Loops and Files
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Sample Questions
Q1) This is an item that separates other items.
A) Controller
B) Partition
C) Doorway
D) Delimiter
Q2) What will be printed after the following code is executed? for (int number = 5;number < = 15;number +=3)
System.out.print(number + ",");
A) 5,6,7,8,9,10,11,12,13,14,15,
B) 5,8,11,14,17,
C) 5,8,11,14,
D) This is an invalid for statement
Q3) In a for statement,the control variable can only be incremented.
A)True
B)False
Q4) This type of loop will always be executed at least once.
A) pre-test loop
B) post-test loop
C) sentinel loop
D) for loop
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Chapter 5: Methods
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Sample Questions
Q1) Only constants and variables may be passed as arguments to methods.
A)True
B)False
Q2) Local variables
A) are hidden from other methods
B) may have the same name as local variables in other methods
C) lose the values stored in them between calls to the method in which the variable is declared
D) All of the above
Q3) All @param tags in a method's documentation comment must
A) end with a */
B) appear after the general description of the method
C) appear before the method header
D) span several lines
Q4) The process of breaking a problem down into smaller pieces is called
A) functional decomposition
B) scientific method
C) top-down programming
D) whole-into-part
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Chapter 6: A First Look at Classes
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Sample Questions
Q1) The public access specifier for a field indicates that the attribute may not be accessed by statements outside the class.
A)True
B)False
Q2) Which of the following statements will create a reference,str,to the String,"Hello,World"?
A) String str = "Hello,World";
B) string str = "Hello,World";
C) String str = new "Hello,World";
D) str = "Hello,World";
Q3) Look at the following statement. import java.util.Scanner; This is an example of
A) a wildcard import
B) an explicit import
C) unconditional import
D) conditional import
Q4) A constructor is a method that is automatically called when an object is created.
A)True
B)False
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Chapter 7: A First Look at Gui Applications
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Sample Questions
Q1) Programs that operate in a GUI environment must be
A) event driven
B) in color
C) dialog boxes
D) layout managers
Q2) A GUI program automatically stops executing when the end of the main method is reached.
A)True
B)False
Q3) These types of components are coupled with their underlying peers.
A) Lightweight
B) Featherweight
C) Middleweight
D) Heavyweight
Q4) If button1 is a JButton object,which of the following statements will make its background blue?
A) button1.makeBackground(BLUE);
B) button1.setBackground(Color.BLUE);
C) button1.makeBackground(Color.BLUE);
D) button1.set.Background(BLUE);
Page 9
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Chapter 8: Arrays and the Arraylist Class
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Sample Questions
Q1) What will be the value of x[1] after the following code is executed? int[] x = {22,33,44}; ArrayProcess(x);
Public static void arrayProcess(int[] a) { For(int k = 0;k < 3;k++) { A[k] = a[k] + 5; }
A) 27
B) 33
C) 38
D) 49
Q2) An ArrayList object automatically expands in size to accommodate the items stored in it.
A)True
B)False
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Chapter 9: A Second Look at Classes and Objects
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Sample Questions
Q1) Which of the following is not true about static methods?
A) It is not necessary for an instance of the class to be created to execute the method.
B) They are created by placing the key word static after the access specifier in the method header.
C) They are called from an instance of the class.
D) They are often used to create utility classes that perform operations on data,but have no need to collect and store data.
Q2) The this key word is the name of a reference variable that is available to all static methods.
A)True
B)False
Q3) If object1 and object2 are objects of the same class,to make object2 a copy of object1
A) assign object1 to object2,such as object2 = object1;
B) write a copy method that will make a field by field copy of object1 data members into object2 data members
C) use the Java copy method that is a part of the Java language
D) use the default constructor to create object2 with object1 data members
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11
Chapter 10: Text Processing and More About Wrapper
Classes
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Sample Questions
Q1) What will be printed after the following code is executed? String str = "abc456"; Int m = 0; While ( m < 6 )
{ If (!Character.isLetter(str.charAt(m))) System.out.print( Character.toUpperCase(str.charAt(m))); M++;
}
A) 456
B) ABC456
C) ABC
D) abc456
Q2) You cannot assign a value to a wrapper class object.
A)True
B)False
Q3) StringBuilder objects are immutable.
A)True
B)False
Page 12
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Chapter 11: Inheritance
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Sample Questions
Q1) In UML diagrams,inheritance is shown
A) With a line that has an open arrowhead at one end that points to the superclass
B) With a line that has an open arrowhead at one end that points to the subclass
C) With a line that has a closed arrowhead at one end that points to the superclass
D) With a line that has a closed arrowhead at one end that points to the subclass
Q2) Protected members are
A) not quite private
B) not quite public
C) Both A and B
D) Neither A or B
Q3) In the following statement,which is the interface? public class ClassA extends ClassB implements ClassC
A) ClassA
B) ClassB
C) ClassC
D) Cannot tell
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Chapter 12: Exceptions and Advanced File Io
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Sample Questions
Q1) This is a section of code that gracefully responds to exceptions when they are thrown.
A) Thrown class
B) Default exception handler
C) Exception
D) Exception handler
Q2) If,within one try statement you want to have catch clauses that catch exceptions of the following types,in which order should they appear in your program? (1)Throwable (2)Exception
(3)RuntimeException
(4)NumberFormatException
A) 4,3,2,1
B) 2,3,1,4
C) 4,1,3,2
D) 3,1,2,4
Q3) A class must implement the Serializable interface in order for objects of the class to be serialized.
A)True
B)False
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Chapter 13: Advanced Gui Applications
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Sample Questions
Q1) The ImageIcon class constructor accepts
A) an integer that references the image.
B) a String argument which is the name of the image file.
C) a String argument which is the name of the image.
D) it does not accept any arguments.
Q2) If addressList exists and has values stored in it and addrList is an array with values stored in it,what will be the results when the following code is executed? addressList.setListData(addrList);
A) The values of addrList will be attached at the end of the current addressList.
B) The values in addressList will be replaced by the values in addrList.
C) The values of addrList will be inserted at the beginning of the current addressList.
D) addressList will be unchanged.
Q3) In the following code the setPreferredSize method sets the size of the text,"Have a good day".
label = new Jlabel("Have a good day",SwingConstants.CENTER);
label.setPreferredSize(new Dimension(400,200));
A)True
B)False
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Chapter 14: Applets and More
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Sample Questions
Q1) In the link produced by the following HTML,what word would you click to go to the linked location? Click here to learn more about < a href="http://www.applications.com" >applications.< /a >
A) Click
B) here
C) Click here to learn more about
D) applications
Q2) These are Java programs that are usually part of a Web site.
A) Applications
B) Applets
C) Classes
D) Web services
Q3) For all Swing components except JApplet and JFrame,you should override the paintComponent method instead of the paint method.
A)True
B)False
Q4) Whenever you need a component of any type to be painted,call the paint method.
A)True
B)False
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Chapter 15: Recursion
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Sample Questions
Q1) A problem can be solved recursively if it can be broken down into successive smaller problems that are identical to the overall problem.
A)True
B)False
Q2) This type of method is a method that calls itself.
A) Looping
B) Circular
C) Recursive
D) Reoccurring
Q3) Like _________,a recursive method must have some way to control the number of times it repeats.
A) a loop
B) any method
C) a GUI method
D) a rumor
Q4) If Method A calls Method B which in turn calls Method A,it is called indirect recursion.
A)True
B)False
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Page 17
Chapter 16: Sorting, Searching, and Algorithm Analysis
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Sample Questions
Q1) A search for an item X in a portion of a sorted array works by repeatedly selecting the middle item and comparing it to X.If X is not found there,the search method selects either the portion of the array to the left of the middle item,or the portion of the array to the right of the middle item,and continues the search.This method is called
A) sequential search
B) binary search
C) selection search
D) None of the above
Q2) The binary search algorithm
A) cannot be used to search an array that is not sorted
B) does twice as much work as sequential search on the average case
C) must be written using recursion
D) is slower than sequential search when the item being searched for is not in the array
Q3) For a computational problem,the input size
A) is the number of times the program requests input from the user
B) is the number of loop iterations required to read the input
C) is the amount of memory needed to store the input
D) None of the above
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Chapter 17: Generics
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Sample Questions
Q1) Consider a method of the form
Void printPoint(Point< Number > p){
//Code not shown
}
Where Point< T > is a generic type.When the method is called,the only objects that may be passed for the parameter p are
A) Point< Number > objects only
B) Point< T > objects,where T is the Number class,or is any subclass of Number
C) Point< T > objects,where T is the Number class,or is any superclass of Number
D) All of the above
Q2) The automatic conversion of a primitive type to the corresponding wrapper type when being passed as parameter to a generic class is called
A) type promotion
B) type wrapping
C) autoconversion
D) autoboxing
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Chapter 18: Collections
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Sample Questions
Q1) The code
List< String > myLs = new ArrayList< String >( );
Uses a List < String > interface variable to reference the concrete ArrayList< String > object.
The advantage of doing this is
A) the class of the collection object can later be changed to LinkedList,or even Vector,without needing to change anything else in the program
B) the class of the collection object can later be changed to LinkedList,Vector,TreeSet,or even HashSet,without needing to change anything else in the program
C) the program compiles faster
D) None of the above: the statement is a type error.
Q2) A TreeSet
A) is like a Set,only it is faster
B) is a Set that allows elements to be retrieved in the order added
C) is a Set that organizes its elements in a tree according to the inheritance hierarchy of the elements
D) is like a Set that allows elements to be retrieved according to their natural order,or according to an order specified by a Comparator
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Chapter 19: Array-Based Lists
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Q1) The size of an array-based list such as ArrayList
A) is the number of bytes of memory that the list can hold
B) is the number of elements that are currently stored in the list
C) is the length of its internal array
D) None of the above
Q2) A new element is added to an ArrayList object at index k.Assuming the list has size s and does not have to be resized,
A) the elements at current positions 0..k must be moved toward the beginning of the list
B) the elements at current positions k..s-1 must be moved toward the end of the array
C) the elements at current positions k..s must be moved toward the end of the array
D) the element at position k is overwritten
Q3) The position of an item within a list is called its
A) index
B) rank
C) level
D) number
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Chapter 20: Linked Lists
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Q1) The tail of a list
A) is an instance of a class that implements the ListTail interface
B) is what you get when take a list and remove its head
C) is a synchronized subclass of the LinkedList class
D) None of the above
Q2) A linked list class uses a Node class to represent nodes.A private recursive method Node add(int index,E element,Node list)takes a reference list (referring to the first in a chain of Node objects),adds a node containing the given element at the given index,and returns a reference to the first node of the resulting chain.Assume that index is nonnegative and is less than or equal to the size of list.Under these circumstances,the add method should handle its base case (index is 0)by
A) returning list
B) adding a node containing element to the front of list and returning a reference to the newly created node
C) adding a node containing element to the front of list and returning list
D) adding a node containing element to the end of list
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Chapter 21: Stacks and Queues
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Sample Questions
Q1) A queue based on a linked list uses the following code Class Node{ String element; Node next;
Node (String el,Node n){
Element = el;
Next = n; } }
Node front,rear;
What is the right code for a constructor for such a linked list class?
A) element = el;next = n;
B) front = rear;
C) front = null;rear = null;
D) front = element;rear = front;
Q2) The operation for adding an item to a queue is called
A) requeue
B) enqueue
C) dequeue
D) proqueue
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Chapter 22: Binary Trees, Avl Trees, and Priority Queues
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Q1) The predecessor of a node in a binary tree is called its A) progenitor
B) ancestor
C) parent
D) precursor
Q2) The heap sort method has a worst case complexity function that is in
A) O(log n)
B) O(n.
C) O(n2.
D) O(n log n.
Q3) Consider the operation of deleting the root of a binary search tree.If the root is a leaf,then
A) the method doing the deletion should throw an exception
B) the root should be replaced with a dummy place-holder node
C) the reference to the root of the tree should be set to null
D) the element stored in the root node should be replaced with null,or with 0.
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