Programming in Java Exam Solutions
Course Introduction
Programming in Java is an introductory course that explores the foundational concepts of computer programming using the Java language. Students will learn core programming principles such as variables, data types, control structures, object-oriented programming, and exception handling. The course emphasizes problem-solving techniques and practical application through coding assignments and projects. By the end of the course, students will have the skills to design, implement, and debug Java programs, preparing them for more advanced topics in software development.
Recommended Textbook
Java Software Solutions Foundations of Program Design 7th Edition by John Lewis
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13 Chapters
820 Verified Questions
820 Flashcards
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Chapter 1: Introduction
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Sample Questions
Q1) Volatility is a property of
A) RAM
B) ROM
C) disk
D) software
E) computer networks
Answer: A
Q2) Which of the following is not syntactically legal in Java?
A) public class Foo
B) System.out.println("Hi");
C) { }
D) s t a t i c main(String[ ] args)
E) only B is legally valid, all of the rest are illegal
Answer: D
Q3) Objects are defined by a class that describes the characteristics common to all instances of the class.
A)True
B)False
Answer: True
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Page 3
Chapter 2: Data and Expressions
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77 Flashcards
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Sample Questions
Q1) Write the paint method for an applet so that it contains 4 concentric circles (each circle is inside the previous circle), where the largest circle is bounded by a 400x400 box and the smallest is bounded by a 100x100 box. Each circle is centered on an applet that is 400x400. Make each circle a different color of your choice. Answer: public void paint(Graphics page) { page.setColor(Color.white); page.fillOval(0, 0, 400, 400); page.setColor(Color.yellow); page.fillOval(50, 50, 300, 300); page.setColor(Color.orange); page.fillOval(100, 100, 200, 200); page.setColor(Color.red); page.fillOval(150, 150, 100, 100); }
Q2) Java is able to represent 255 * 255 * 255 = 16,581,375 distinct colors. A)True B)False
Answer: False
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Page 4
Chapter 3: Using Classes and Objects
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Sample Questions
Q1) You may use the String replace( ) method to remove characters from a String.
A)True
B)False
Answer: False
Q2) Say you write a program that makes use of the Random class, but you fail to include an import statement for java.util.Random (or java.util.*). What will happen when you attempt to compile and run your program.
A) The program won't run, but it will compile with a warning about the missing class.
B) The program won't compile-you'll receive a syntax error about the missing class.
C) The program will compile, but you'll receive a warning about the missing class.
D) The program will encounter a runtime error when it attempts to access any member of the Random class
E) none of the above
Answer: B
Q3) Write a statement using a Scanner method to get the first name interactively. Answer: firstName = scan.nextLine( );
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Page 5
Chapter 4: Writing Classes
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Sample Questions
Q1) The relationship between a class and an object is best described as A) classes are instances of objects
B) objects are instances of classes
C) objects and classes are the same thing
D) classes are programs while objects are variables
E) objects are the instance data of classes
Q2) A method defined in a class can access the class' instance data without needing to pass them as parameters or declare them as local variables.
A)True
B)False
Q3) Regarding the software failure described at the Denver International Airport, it is critical to factor in errors and inefficiencies that always occur in a complex system.
A)True
B)False
Q4) The interface of a class is based on those data instances and methods that are declared public.
A)True
B)False
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Chapter 5: Conditionals and Loops
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Sample Questions
Q1) The expression (!done && x <= y) is True.
A)True
B)False
Q2) Assume that x and y are int variables with x = 5, y = 3, and a and d are char variables with a = 'a' and d = 'A', and examine the following conditions: Condition 1: (x < y && x > 0)
Condition 2: (a != d || x != 5)
Condition 3: !(True && false)
Condition 4: (x > y || a == 'A' || d != 'A')
A) All 4 Conditions are True
B) Only Condition 2 is True
C) Condition 2 and Condition 4 are True only
D) Conditions 2, 3 and 4 are all True, Condition 1 is not
E) All 4 Conditions are false
Q3) Rewrite the following set of if statements using a nested if-else structure. if (score >= 90) grade = 'A'; if (score >= 80 && score < 90) grade = 'B'; if (score >= 70 && score < 80) grade = 'C'; if (score >= 60 && score < 70) grade = 'D'; if (score < 60) grade = 'F';
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Page 7
Chapter 6: More Conditionals and Loops
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Sample Questions
Q1) Write a "query-controlled" loop that will continue to input int values from the user, adding each to the int value sum, and then ask if the user has another value to input, until the user says that there are no more values. Assume that cs1.Keyboard has been imported.
Q2) Write some code that inputs a set of int values and computes its average. Ask the user first how many int values will be input. Make sure that your code cannot produce a division by zero error. Assume that cs1.Keyboard has been imported.
Q3) The following code has a syntax error immediately before the word else. What is the error and why does it arise?
Fix the code so that this statement is a legal if-else statement. if (x < 0) ; x++; else x--;
Q4) The statement if (x < 0) y = x; else y = 0; can be rewritten using a conditional operator as
A) y = (x < 0) ? x : 0;
B) x = (x < 0) ? y : 0;
C) (x < 0) ? y = x : y = 0;
D) y = (x < 0);
E) y = if (x < 0) x : 0;
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Chapter 7: Object-Oriented Design
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Sample Questions
Q1) What is wrong with the following message to create a BoxLayout for the JPanel jp?
Jp)setLayout(new BoxLayout(BoxLayout.X_AXIS));
A) X_AXIS is not a valid constant for BoxLayout, it should instead be HORIZONTAL
B) Aside from X_AXIS, the constructor also requires a Dimension to determine the size of the Box
C) Aside from X_AXIS, the constructor also needs a command regarding horizontal glue as in createHorizontalGlue( )
D) The BoxLayout constructor is lacking a reference to the container that the BoxLayout manager will govern
E) There is nothing wrong with it at all
Q2) The idea of having programmers and developers meet in order to critique a software design or implementation is known as A) an interview
B) a walkthrough
C) prototyping
D) aggregation
E) evolutionary development
Q3) Provide a reason why a method would be declared static.
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Chapter 8: Arrays
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Sample Questions
Q1) In a two-dimensional array, both dimensions must have the same number of elements, as in[10][10].
A)True
B)False
Q2) Which of the following lists of numbers would accurately show the array after the second pass of the Selection Sort algorithm?
A) 9, 4, 12, 2, 6, 8, 18
B) 2, 4, 9, 6, 12, 8, 18
C) 2, 4, 12, 9, 6, 8, 18
D) 2, 4, 6, 8, 9, 12, 18
E) 2, 4, 12, 6, 8, 9, 18
Q3) The statement System.out.println(values[7]); will
A) output 7
B) output 18
C) output nothing
D) cause an ArrayOutOfBoundsException to be thrown
E) cause a syntax error
Q4) Explain how to alter the Selection Sort algorithm so that it sorts in descending order instead of ascending order.
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Chapter 9: Inheritance
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Sample Questions
Q1) The assignment statement d = p; is legal even though d is not a Poodle.
A)True
B)False
Q2) Using the reserved word, super, one can
A) access a parent class'constructor(s)
B) access a parent class'methods and instance data
C) access a child class'constructor(s)
D) access a child class'methods and instance data
E) none of the above
Q3) What is the advantage of extending an adapter class rather than implementing a listener interface?
Q4) What methods inherited from Car should SportsCar override?
Q5) A motorcycle inherits properties from both a bicycle and a car. Java does not permit multiple inheritance. Assume that Bicycle and Car have both been declared. Explain how you might go about implementing a Motorcycle as a derived class.
Q6) You may use the super reserved word to access a parent class'private members.
A)True
B)False
Q7) Explain the difference between implementing an interface and a derived class.
Page 11
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Chapter 10: Polymorphism
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Sample Questions
Q1) Which of the following GUI components would you use to display a list of options so that the user could select between the entries in the list?
A) JComboBox
B) JList
C) JSlider
D) JScrollPane
E) JOptionPane
Q2) Binary search can be used on unsorted data it will just perform more slowly.
A)True
B)False
Q3) The GUI should react whenever the JButton is clicked, so the JFrame will need an ActionListener. Write the actionPerformed method to implement the ActionListener so that the GUI will compute the cost of the movie when the JButton is clicked. This method will have to obtain the values specified in the JComboBox and the JSlider and output the computed cost in the JLabel. Assume that a Matinee costs $5.00 per ticket, a Rush Hour show $3.50 per ticket and Normal show costs $7.50 per ticket.
Q4) Explain how to alter the Selection Sort algorithm so that it sorts in descending order instead of ascending order.
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Page 12
Chapter 11: Exceptions
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Sample Questions
Q1) Write a save method that will save a given student to the String filename passed as a parameter.
Q2) The following defines a new Exception called AnewException. public Exception ANewException { public ANewException(String message) { super(message); }
A)True
B)False
Q3) Assume infile is a BufferedReader for a textfile and that the textfile is empty. What is returned from the message infile.readLine( ); ?
A) 0
B) null
C) a special character known as the End-of-file marker (EOF)
D) none of the above, the message causes a NullPointerException to be thrown
E) none of the above, the message causes a EndOfFileException to be thrown
Q4) Explain how you would use a Timer to create animation in a JLabel.
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Chapter 12: Recursion
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Sample Questions
Q1) If there are 6 disks to move from one Tower to another, how many disk movements would it take to solve the problem using the recursive solution?
A) 6
B) 13
C) 31
D) 63
E) 127
Q2) What is returned if factorial(3) is called?
A) 0
B) 1
C) 3
D) 6
E) 9
Q3) It always is possible to replace a recursion by an iteration and vice versa.
A)True
B)False
Q4) Describe how to solve the Towers of Hanoi problem using 4 disks (that is, write down move for move how to solve the problem).
Q5) Explain what a "base case" is in a recursive method.
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Chapter 13: Collections
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Sample Questions
Q1) An array is a List Abstract Data Type.
A)True
B)False
Q2) The Abstract Data Type (ADT) is thought of as abstract because the operations that are to be implemented are separated from the actual implementation, that is, an ADT can be implemented in more than one way and that implementation is separate from how we might use the ADT.
A)True
B)False
Q3) A linked list that contains 6 Nodes will have 6 reference pointers.
A)True
B)False
Q4) A linear data structure
A) always has more than one link per node
B) is sometimes represented as a tree or a graph
C) can have but a single link per node
D) almost always is kept in sorted order either ascending or descending
E) none of the above
Q5) What common Exception(s) might arise when using an array? What common Exception(s) might arise when using a linked list?
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