Introduction to Programming Review Questions
Course Introduction
Introduction to Programming is a foundational course designed to equip students with essential problem-solving skills and a solid understanding of fundamental programming concepts. Through hands-on exercises and projects, students will learn to write, test, and debug simple computer programs using a high-level programming language. The course covers key topics such as variables, data types, control structures, functions, and basic algorithms. By the end of the course, students will be able to develop clear, efficient, and well-structured code, laying the groundwork for further studies in computer science and related fields.
Recommended Textbook
Java Software Solutions 8th Edition by John Lewis
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13 Chapters
820 Verified Questions
820 Flashcards
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Page 2
Chapter 1: Introduction
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Sample Questions
Q1) A color image is broken down into individual pixels (points), each of which is represented by
A) a 1 for white and a 0 for black
B) 3 values denoting the intensity of red, green, and blue in the image
C) a single number indicating the intensity of color between white and black
D) two numbers, a value that denotes where between white and black the color is, and a brightness
E) none of the above, it is not possible to represent a color image
Answer: B
Q2) Which of the following characters does not need to have an associated "closing" character in a Java program?
A) {
B) (
C) [
D) <
E) all of these require closing characters
Answer: D
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Chapter 2: Data and Expressions
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Sample Questions
Q1) Which of the following is True regarding the mod operator, %?
A) It can only be performed on int values and its result is a double
B) It can only be performed on int values and its result is an int
C) It can only be performed on float or double values and its result is an int
D) It can only be performed on float or double values and its result is a double E) It can be performed on any numeric values, and the result always is numeric
Answer: E
Q2) Given two points in an applet represented by the four int variables x1, y1, x2 and y2, write a paint method to draw a line between the two points and write the location of the two points next to the two points. Answer: public void paint(Graphics page)
{ page.setColor(Color.blue); page.drawLine(x1, y1, x2, y2); page.drawString("" + x1 + ", " + y1, x1, y1); page.drawString("" + x2 + ", " + y2, x2, y2); }
Q3) Write an output statement which will output the following characters exactly as shown: / ' \" / ' \
Answer: System.out.println("/ \ ' \ \ \" / \ ' \ \ ");
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Chapter 3: Using Classes and Objects
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Sample Questions
Q1) What is the advantage of putting an image in a JLabel instance?
A) It becomes part of the component and is laid out automatically
B) It becomes part of the container and is automatically scaled
C) Although it becomes part of the instance, it still must be drawn separately
D) The runtime efficiency is greatly improved
E) None of the above
Answer: A
Q2) What is the purpose of the ImageIcon class?
Answer: The ImageIcon class is used to represent an image that is included in a label. The ImageIcon constructor takes the name of an image file (which may contain a JPEG, GIF, or PNG image) and loads it into the object.
Q3) These two ways of setting up a String yield identical results:
a) String string = new String("123.45");
b) String string = "" + 123.45;
A)True
B)False
Answer: True
Q4) Write a statement using a Scanner method to get the first name interactively. Answer: firstName = scan.nextLine( );
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Chapter 4: Writing Classes
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Sample Questions
Q1) A constructor may contain a return statement so long as no value (or expression) is returned.
A)True B)False
Q2) While multiple objects of the same class can exist, in a given program there can be only one version of each class.
A)True B)False
Q3) Assume that another method has been defined that will compute and return the student's class rank (Freshman, Sophomore, etc). It is defined as: public String getClassRank( )
Given that s1 is a student, which of the following would properly be used to get s1's class rank?
A) s1 = getClassRank( );
B) s1.toString( );
C) s1.getHours( );
D) s1.getClassRank( );
E) getClassRank(s1);
Q4) Write a statement to output the volume of the blue box.
Q5) Add a constructor to class Box for a cube, which has only 1 parameter, side.
Page 6
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Chapter 5: Conditionals and Loops
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Sample Questions
Q1) What is wrong, logically, with the following code? If (x > 10) System.out.println("Large");
Else if (x > 6 && x <= 10) System.out.println("Medium");
Else if (x > 3 && x <= 6) System.out.println("Small"); Else System.out.println("Very small");
A) There is no logical error, but there is no need to have (x <= 10) in the second conditional or (x <= 6) in the third conditional
B) There is no logical error, but there is no need to have (x > 6) in the second conditional or (x > 3) in the third conditional
C) The logical error is that no matter what value x is, "Very small" is always printed out D) The logical error is that no matter what value x is, "Large" is always printed out E) There is nothing wrong with the logic at all
Q2) String s1 is said to overlap String s2 if all of the characters in s1 also appear in s2. Write a set of code that will set the boolean variable overlap to True if s1 overlaps s2 and false otherwise. Assume both s1 and s2 have already been input.
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Chapter 6: More Conditionals and Loops
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Sample Questions
Q1) The do loop differs from the while loop in that A) the while loop will always execute the body of the loop at least once B) the do loop will always execute the body of the loop at least once C) the do loop will continue to loop while condition in the while statement is false and the while loop will continue to loop while the condition in the while statement is True D) the while loop will continue to loop while condition in the while statement is false and the do loop will continue to loop while the condition in the while statement is True E) none of the above, there is absolutely no difference between the two types of loops
Q2) This paint method will draw several bars (sort of like a bar graph). How many bars will be displayed?
A) 4
B) 5
C) 6
D) 10
E) 20
Q3) Rewrite the following if-else statement using a conditional operator. if (x > y) z = x; else z = y;
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Chapter 7: Object-Oriented Design
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Sample Questions
Q1) If classes C1 and C2 both implement an interface Cint, which has a method whichIsIt, and if C1 c = new C1( ); is performed at one point of the program, then a later instruction c.whichIsIt( ); will invoke the whichIsIt method defined in C1.
A)True
B)False
Q2) To implement Comparable for the ChessPiece class, the current ChessPiece's type is compared to a ChessPiece passed as a parameter. The method should return 0 if the types are equal, -1 if this piece's type is a lesser piece than the parameter's type, and 1 if this piece's type is a greater piece than the parameter's type. Pieces are ordered as follows: "Pawn" is a lesser piece to a "Knight" and a "Bishop", "Knight" and "Bishop" are equivalent for this example, both are lesser pieces to a "Rook" which is a lesser piece to a "Queen" which is a lesser piece to a "King." Write the proper method to implement Comparable for this class.
Q3) Assume a class Foo implements Comparable. Without knowing anything else about the Foo class, write an equal method that returns True if the Foo parameter passed to this Foo is equal to this Foo as determined by using the implementation of Comparable.
Q4) Provide a reason why a method would be declared static.
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Chapter 8: Arrays
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Sample Questions
Q1) Write a method to compute and return the value of max - min where max is the largest element of an int array and min is the smallest element of an int array. The method is passed the int array and an int value that denotes the number of elements in the array. You may assume that the int array has at least 1 element in it.
Q2) Which of the following lists of numbers would accurately show the array after the first pass through the Selection Sort algorithm?
A) 9, 4, 12, 2, 6, 8, 18
B) 4, 9, 12, 2, 6, 8, 18
C) 2, 4, 12, 9, 6, 8, 18
D) 2, 4, 6, 8, 9, 12, 18
E) 2, 4, 9, 12, 6, 8, 18
Q3) The Key Events include
A) keyPressed, keyReleased
B) keyPressed, keyReleased, keyTyped
C) keyPressed, keyReleased, keyTyped, keyDown, keyUp
D) keyDown, keyUp, keyTyped
E) none of the above
Q4) Write code fragment to swap the two Strings stored by variables a and b.
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Page 10
Chapter 9: Inheritance
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Sample Questions
Q1) Although classes can be inherited from one-another, even Abstract classes, interfaces cannot be inherited.
A)True
B)False
Q2) Assume a class Triangle has been defined. It has three instance data, Point p1, p2, p3. The class also has a constructor that receives the 3 Points and initializes p1, p2, and p3, a toString method that outputs the 3 Points, and a computeSurfaceArea method that calculates the surface area of the Triangle (as an int value). We want to extend this class to represent a 3-dimensional Pyramid, which consists of 4 Points. Since the Pyramid will consist of in essence, 4 triangles, computeSurfaceArea for the Pyramid will compute 4 * the surface area of the Triangle made up of 3 of those 4 Points. Write the Pyramid class to handle the difference(s) between a Pyramid and the previously defined Triangle. Assume the instance data of Triangle are protected and all methods are public. Also assume that the class Point has a toString method.
Q3) The protected visibility modifier provides the best possible encapsulation that permits inheritance.
A)True
B)False
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11
Chapter 10: Polymorphism
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Sample Questions
Q1) Which of the following is a listener class for a JSlider?
A) ListListener
B) ActionListener
C) ButtonListener
D) ChangeListener
E) SlideListener
Q2) Write a set of code that will create 4 JButtons and add each of these to a JPanel so that they appear in a 2x2 grid. The JButtons will not have any text appear in them (i.e. no commands or names) but instead, will each appear as a color set by the user by using JColorChooser.
Q3) What does the following code do? Assume list is an array of int values, temp is some previously initialized int value, and c is an int initialized to 0.
For (j=0; j < list.length; j++)
If (list[j] < temp) c++;
A) It finds the smallest value and stores it in temp
B) It finds the largest value and stores it in temp
C) It counts the number of elements equal to the smallest value in list
D) It counts the number of elements in list that are less than temp
E) It sorts the values in list to be in ascending order
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Page 12
Chapter 11: Exceptions
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Sample Questions
Q1) A finally clause will execute
A) only if the try statement that precedes it does not throw an exception
B) only if the try statement that precedes it throws an exception that is caught C) only if the try statement that precedes it throws an exception that is not caught D) only if the try statement that precedes it throws an exception, whether it is caught or not
E) in any circumstance
Q2) The following defines a new Exception called AnewException. public Exception ANewException { public ANewException(String message) { super(message); } } A)True B)False
Q3) Write a save method that will save a given student to the String filename passed as a parameter.
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Page 13
Chapter 12: Recursion
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Sample Questions
Q1) Consider the following recursive sum method: public int sum(int x)
{ if (x = = 0) return 0; else return sum(x - 1) + 1;
}
If the base case is replaced with "if (x = = 1) return 1;" the method will still compute the same thing.
A)True
B)False
Q2) Aside from writing recursive methods, another way that recursion is often used is to define
A) words in English
B) mathematical functions
C) rules and laws
D) child classes of a parent class in object-oriented programming
E) recursion is used in all of the above
Q3) It always is possible to replace a recursion by an iteration and vice versa.
A)True
B)False
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Chapter 13: Collections
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Sample Questions
Q1) A variation of a linked list is a circular linked list where the last Node in the list has next = head rather than next = null. One problem with this type of list is that
A) it wastes memory space since head already points at the first Node, so the last one does not need to
B) there is no ability to add a new Node at the end of the list since the last Node points at the first Node
C) it is more difficult to traverse the list since the old terminating condition, (next = = null), is no longer True for the last node
D) a header Node for this type of list is more complex
E) all of the above
Q2) This type of linked list is referred to as a
A) singly linked list
B) doubly linked list
C) singly linked list with a header node
D) doubly linked list with a header node
E) singly linked list with a head and rear references
Q3) A Stack s stores int values. Show what s will look like after each of the following instructions is executed.
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