Computer Science I
Exam Answer Key
Course Introduction
Computer Science I is an introductory course designed to provide students with a foundational understanding of computer science principles and programming. The course covers essential topics such as algorithm development, problem-solving techniques, data types, control structures, functions, and the basics of software development. Students will learn to write, debug, and test programs using a programming language commonly used in industry, while also gaining insight into the underlying concepts that drive computational thinking. Emphasis is placed on hands-on experience and the practical application of coding skills to solve real-world problems, preparing students for more advanced courses in computer science.
Recommended Textbook
Java Programming 7th Edition by Joyce Farrell
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Chapter 1: Creating Java Programs
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Sample Questions
Q1) Regarding code layout, what would be an equally valid and legal way to write the following Java code: public static void main(String[] args) { System.out.println("First Java application"); }
Answer: public static void main(String[] args) { System.out.println("First Java application"); }
Q2) You must use the Java interpreter to translate the bytecode into executable statements before running a Java application.
A)True
B)False Answer: True
Q3) Programs that are embedded in a Web page are called Java ____.
A) consoles
B) applets
C) applications
D) windowed applications
Answer: B
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Chapter 2: Using Data
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Q1) You can create a confirm dialog box with five arguments.
A)True
B)False
Answer: True
Q2) A floating-point data type
A)operand
B)cast operator
C)assignment
D)operator precedence
E)garbage
F)primitive
G)float
H)boolean
I)escape sequence
Answer: G
Q3) Once a variable has been declared and initialized, new values may not be assigned to the variable.
A)True
B)False
Answer: False
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Chapter 3: Using Methods, Classes, and Objects
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Q1) Data components of a class
A)return statement
B)header
C)instance variables
D)methods signature
E)formal parameters
F)static method
G)data fields
H)parameter type
I)class user
Answer: C
Q2) Public classes are accessible by all objects, which means that public classes can be ____, or used as a basis for any other class.
A) saved
B) extended
C) copied
D) used
Answer: B
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Chapter 4: More Object Concepts
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Q1) Variables associated with individual objects
A)optional classes
B)instance variables
C)comes into scope
D)class methods
E)overloading
F)Math class
G)redeclaring a variable
H)GregorianCalendar
I)constant
Q2) A variable comes into existence, or ____, when you declare it.
A) goes out of scope
B) comes into scope
C) overrides scope
D) is referenced
Q3) Describe the impact that blocks and methods have on variables with the same name.
Q4) Describe and provide an example of overloading.
Q5) A(n) ____________________ begins immediately after the method declaration and ends at the end of the method.
Page 6
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Chapter 5: Making Decisions
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Q1) You can use the ____, which is written as ||, if you want some action to occur when at least one of two conditions is true.
A) conditional OR operator
B) logical AND operator
C) range check
D) switch statement
Q2) The ____ operator is written as the exclamation point ( ! ).
A) equality
B) AND
C) assignment
D) NOT
Q3) When working with logical operators, you can always use ____ to change precedence.
A) conditional operators
B) break statements
C) parentheses
D) semicolons
Q4) Why would a programmer need to use a range check? Give an example.
Q5) ____________________ is a tool that helps programmers plan a program's logic by writing plain English statements.
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Chapter 6: Looping
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Q1) A loop that never ends is called a(n) ____ loop.
A) definite
B) infinite
C) while
D) for
Q2) The statements that make up a loop body will continue to execute as long as the expression value remains false.
A)True
B)False
Q3) How are indefinite loops used for validating data? Why is a loop structure typically the better choice for validating data than an if statement?
Q4) When nesting loops, the variable in the outer loop changes more frequently.
A)True
B)False
Q5) A ____ is a structure that allows repeated execution of a block of statements.
A) body
B) Boolean expression
C) loop
D) loop control
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Chapter 7: Characters, Strings, and the Stringbuilder
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Q1) Strings that cannot be changed are said to be immutable. What does this mean and how does it relate to values held in memory addresses?
Q2) The StringBuilder class is more efficient than the StringBuffer class because it can execute multiple threads during program execution. A)True B)False
Q3) String aName = "Michael"
Using the above statement, write the length() method that will return the length of the aName String. What value will the length() method return when executed?
Q4) String firstCompare = "Oak Maple Pine"
String secondCompare = "spruce maple elm" firstCompare.regionMatches(false, 4, secondCompare, 7, 5)
Using the above code, what will be the Boolean value after execution of the regionMatches statement? Explain how the Strings are compared using the regionMatches() method.
Q5) How is the String class equalsIgnoreCase() method like the equals() method and how would you use it? Give an example.
Q6) Describe how a reference is used in Java.
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Chapter 8: Arrays
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Q1) An enhanced for loop
A)array variable
B)reference type
C)elements
D)int
E)Java object names
F)length
G)foreach loop
H)reference types
I)return
Q2) When you create an array of objects, each reference is assigned the value ____.
A) null
B) '\u0000'
C) true
D) false
Q3) When you create an array variable, memory space is automatically reserved.
A)True
B)False
Q4) Why would you use spacing when initializing parallel arrays?
Q5) What does an array's name represent and what value does it hold when declared?
Page 10
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Chapter 9: Advanced Array Concepts
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Q1) Write the statement to declare an ArrayList named myVals with a capacity of 15 items. Explain the importance of capacity when working with an ArrayList.
Q2) How can you sort arrays of objects?
Q3) import java.util.*; import javax.swing.*; public class binary_search
{ public static void main(String[] args)
{ int myNums[]={2, 44, 5, 66, 78, 90, 23, 66}; int point, find = 78; point = Arrays.binarySearch(myNums, find); System.out.println("Element found at index " + point); } }
Using the above code, what output will be displayed when the program is executed? Describe how the binarySearch() method functions.
Q4) The Arrays class ____________________ method assigns the specified value to each element of the specified array.
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Chapter 10: Introduction to Inheritance
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Q1) Superclasses can be distinguished from their subclasses because a subclass is generally smaller than a superclass; it usually has fewer fields and methods.
A)True
B)False
Q2) Create a class named Account that contains an integer field for an account number and a double field for an account balance. The class contains a constructor that requires an account number and sets the balance to 0.0. Include a set() method for the balance, a get() method for the account number, and a get() method for the account balance. Create two subclasses named Checking and Savings. Within the Checking class, the get() method should display the String "Checking Account Information", the account number, and the balance. Within the Savings class, add a field to hold the interest rate, and require the Savings constructor to accept an argument for the value of the interest rate. The Savings get() method displays the String "Savings Account Information", the account number, the balance, and the interest.
Q3) Using a class named Student, write the statement to create a yearOne object of the Student class.
Q4) What is information hiding and how is it used?
Q5) What is the process of inlining and how is it accomplished in Java?
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Chapter 11: Advanced Inheritance Concepts
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Q1) If you attempt to instantiate an object from an abstract class, you receive an error message from the compiler that you have committed a(n) ____.
A) LogicError
B) InstantiationError
C) SyntaxError
D) ObjectError
Q2) When you define a class, if you do not explicitly extend another class, your class is an extension of the ____ class.
A) Object
B) super
C) public
D) abstract
Q3) Compare and contrast abstract classes and interfaces.
Q4) How is the Object class equals() method implemented?
Q5) While a class can inherit from any abstract superclass, it can only implement one interface.
A)True
B)False
Q6) What is an abstract class? Give an example and explain how it works.
Page 13
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Chapter 12: Exception Handling
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Q1) How is an Error class different from an Exception class?
Q2) Many developers believe that it is poor style for a method to throw more than ____ type(s) of exceptions.
A) one
B) two
C) three or four
D) eight or ten
Q3) When an exception is a checked exception, client programmers are forced to deal with the possibility that an exception will be thrown.
A)True
B)False
Q4) Unplanned exceptions that occur during a program's execution are also called execution exceptions.
A)True
B)False
Q5) What are the elements that make up a try block?
Q6) When a program contains multiple catch blocks, how are they handled?
Q7) What things might a programmer do to cause a potential exception in a program?
Q8) What advantages does object-oriented exception handling provide?
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Chapter 13: File Input and Output
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Q1) When you perform input and output operations in an application, what is actually occurring with the bytes of information?
Q2) The main directory of your storage device
A)batch processing
B)root
C)buffer
D)flushing
E)stream
F)System.getProperty("line.separator")
G)data file
H)close the files
I)BufferedWriter
Q3) When a String is written, placing each record on a new line makes the output file easier to read and interpret. Since not all platforms use '\n' to separate lines, the BufferedWriter class has two alternatives: the newLine() method and the System.getProperty() method. Describe these two methods and how they operate.
Q4) Briefly describe the Path class in Java.
Q5) Describe and provide an example of the differences between real-time applications and interactive programs.
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Chapter 14: Introduction to Swing Components
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Q1) When creating a Font object, the typeface name must be enclosed in double quotation marks because it is a String.
A)True
B)False
Q2) Write the statement to create a layout manager named myLayout that centers components in each row.
Q3) The ____ responds to keyboard focus events.
A) KeyListener
B) ActionListener
C) ChangeListener
D) FocusListener
Q4) What are some of the decisions you must make when extending a JFrame?
Q5) You define the text to be displayed in a tool tip by using the setToolTipText() method and passing an appropriate ____ to it.
A) Integer
B) Date
C) String
D) Boolean
Q6) How have user interface components changed since the early versions of Java?
Page 16
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Chapter 15: Advanced Gui Topics
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Q1) With ____, a redrawn JPanel is displayed only when it is complete; this provides the viewer with updated screens that do not flicker while being redrawn.
A) single buffering
B) double buffering
C) auto filtering
D) double framing
Q2) The parent class for all event objects is named ____, which descends from the Object class.
A) EventObject
B) Event
C) ParentEvent
D) AWTEvent
Q3) The JMenus are added to the JMenuBar using the ____ method.
A) addMenu()
B) add()
C) addNewMenu()
D) setMenu()
Q4) Describe the two CardLayout constructors.
Q5) How do you find the red, green, and blue components of a color?
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Chapter 16: Graphics
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Q1) Write the statement to create a Rectangle2D.Float object named myRect at 20, 20 with a width of 80 and height of 50.
Q2) If you call getGraphics() in a frame that is not visible, you receive a(n) ____.
A) ForceQuit
B) ExecuteException
C) NonExecute
D) NullPointerException
Q3) The ____ method requires four arguments and draws the outline of a rectangle using the current drawing color.
A) clearRect()
B) drawRect()
C) fillRect()
D) paintRect()
Q4) BasicStroke myLine = new BasicStroke(12.0f, BasicStroke.CAP_SQUARE, BasicStroke.JOIN_ROUND);
The above statement creates a BasicStroke object and makes it the current stroke.
Describe the three arguments that are used in this statement, and then describe the purpose of each.
Q5) What activities does the process of drawing with Java 2D objects include?
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Chapter 17: Applets, Images, and Sound
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Q1) Retrieves and plays the sound as soon as possible after it is called
A)current version of HTML
B)init()
C)start()
D)HTML
E)Applet Viewer
F)tags
G)multimedia
H)applet
I)play()
Q2) What are the two forms of the play() method?
Q3) The ____ command is part of the Java Development Kit (JDK), which provides a convenient environment in which to test your applets.
A) appletview
B) appletviewer
C) viewapplet
D) av
Q4) To run an applet from an HTML document, you add an <object> and ___________________ tag pair.
Q5) A(n) ___________________ is a likeness of a person or thing.
Page 19
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