Computer Science I Exam Solutions
Course Introduction
Computer Science I is an introductory course that covers the fundamental concepts of computer science, including problem-solving, algorithm development, and basic programming principles. Students will learn the syntax and semantics of a high-level programming language, design and implement simple programs, and develop critical thinking skills necessary for debugging and optimizing code. Through hands-on assignments and projects, the course provides a solid foundation for further study in computer science and related fields, emphasizing logical reasoning, structured programming techniques, and effective use of computational tools.
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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Page 2
Chapter 1: Introduction
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Sample Questions
Q1) There are a number of reserved words in Java that have no current meaning (denoted with an * in figure 1.18). Why?
Answer: Java language designers anticipate introducing these statements in future versions, but have not yet implemented them because they are lower priority, or it has not been decided how they will be implemented or precisely what they will mean.
Q2) Volatility is a property of
A) RAM
B) ROM
C) disk
D) software
E) computer networks
Answer: A
Q3) Which memory capacity is the largest?
A) 1,500,000,000,000 bytes
B) 100 gigabytes
C) 3,500,000 kilobytes
D) 10 terabyte
E) 12,000,000 megabytes
Answer: E
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Page 3
Chapter 2: Data and Expressions
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Sample Questions
Q1) The String "A nice box" is drawn
A) above the box
B) to the left of the box
C) to the right of the box
D) below the box
E) inside the box
Answer: D
Q2) Which library package would you import to use the class Random?
A) java.beans
B) java.io
C) java.lang
D) java.text
E) java.util
Answer: E
Q3) In Java, 'a' and 'A' are considered to be different values.
A)True
B)False
Answer: True
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Chapter 3: Using Classes and Objects
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58 Flashcards
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Sample Questions
Q1) The Random class' setSeed( ) method allows you to restart the pseudo-random number sequence.
A)True
B)False
Answer: True
Q2) When comparing any primitive type of variable, == should always be used to test to see if two values are equal.
A)True
B)False
Answer: False
Q3) The String class' compareTo method
A) compares two string in a case-independent manner
B) yields True or false
C) yields 0 if the two strings are identical
D) returns 1 if the first string comes lexically before the second string
E) none of the above
Answer: C
Q4) Write a statement using a method to guarantee that the initial will be a capital letter. Answer: firstInitial = firstInitial.toUpperCase( );
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Chapter 4: Writing Classes
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Sample Questions
Q1) When reasoning about a car, we use such information as its make and model, year, color, cost (or worth), number of miles, gas mileage, insurance cost, and so forth. Consider a program that will attempt to determine how practical a car might be on a road trip. Which of these types of information might you use in your program as instance data?
Provide a justification for your selection.
Q2) A constructor may contain a return statement so long as no value (or expression) is returned.
A)True
B)False
Q3) Add a constructor to class Box for a cube, which has only 1 parameter, side.
Q4) All Java classes must contain a main method which is the first method executed when the Java class is called upon. A)True
B)False
Q5) An Employee will have a name, social security number, position, and hourly wages. Define the instance data for this class.
Q6) Write the constructor, which is passed the player's name and position.
Q7) Write the constructor for this class.
Page 6
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Chapter 5: Conditionals and Loops
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37 Flashcards
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Sample Questions
Q1) The expression (s.concat(t).length( ) < y) is True.
A)True
B)False
Q2) A truth table shows, for the various True or false values of boolean variables, what the result of a boolean condition is. Fill in the following truth table. Assume that a, b and c are boolean variables.
a b c a && (!b | | c)
false false false
false false True
false True false
false True True
True false false
True false True
True True false
True True True
Q3) Regarding the Software Failure: The operators were warned that, although the Therac-25 had many safety precautions, it might be possible to accidentally overdose a patient.
A)True
B)False
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Chapter 6: More Conditionals and Loops
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Sample Questions
Q1) The size of each rectangle (bar)
A) increases in height while staying the same width
B) increases in width while staying the same height
C) increases in both width and height
D) stays the same size
E) decreases in height while staying the same width
Q2) Describe a situation where you should use a do loop and a situation where you should use a while loop.
Q3) A continue statement
A) may be used within a while or a do-while loop, but not a for loop
B) is identical to a break statement within Java loops
C) may be used within any Java loop statement
D) may be used within a for loop, but not within a while or a do-while loop
E) none of the above
Q4) 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.
Q5) 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) Static methods cannot
A) reference instance data
B) reference non-static instance data
C) reference other objects
D) invoke other static methods
E) invoke non-static methods
Q2) Explain the difference between implementing an interface and a derived class.
Q3) Abstract methods are used when defining
A) interface classes
B) derived classes
C) classes that have no constructor
D) arrays
E) classes that have no methods
Q4) Which of the following would not be considered an algorithm?
A) a recipe
B) a computer program
C) pseudocode
D) a shopping list
E) travel directions
Q5) Provide a reason why a method would be declared static.
Page 9
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Chapter 8: Arrays
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Sample Questions
Q1) 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
Q2) A Polygon object in Java is
A) a shape defined as a collection of x, y points
B) a shape defined as a collection of lines
C) a shape defined as a collection of polylines
D) an array of shapes
E) 2 lines connected by 1 common point
Q3) Which of the following loops would adequately add 1 to each element stored in values?
A) for (j=1; j<values.length; j++) values[j]++;
B) for (j=0; j<values.length; j++) values[j]++;
C) for (j=0; j<=values.length; j++) values[j]++;
D) for (j=0; j<values.length-1; j++) values[j]++;
E) for (j=1; j<values.length-1; j++) values[j]++;
Q4) Write code fragment to swap the two Strings stored by variables a and b.
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Chapter 9: Inheritance
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Sample Questions
Q1) Which of the following lists of instance data are accessible in class A2?
A) x, y, z, a, b
B) x, y, z, a
C) x, z, a, b
D) z, a, b
E) a, b
Q2) Assume the class Student implements the Speaker interface from the textbook. Recall that this interface includes two abstract methods, speak( ) and announce(String str). A Student contains one instance data, String classRank. Write the Student class so that it implements Speaker as follows. The speak method will output "I am a newbie here" if the Student is a "Freshman", "I hate school" if the Student is either a "Sophomore" or a "Junior", or "I can not wait to graduate" if the student is a "Senior". The announce method will output "I am a Student, here is what I have to say" followed by the String parameter on a separate line. Finally, the classRank is initialized in the constructor. Only implement the constructor and the methods to implement the Speaker interface.
Q3) The protected visibility modifier provides the best possible encapsulation that permits inheritance.
A)True
B)False
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Page 11
Chapter 10: Polymorphism
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Sample Questions
Q1) Java allows one to create polymorphic references using inheritance and using interfaces.
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) What are the main programming mechanisms that constitute object-oriented programming?
A) encapsulation, inheritance, polymorphism
B) encapsulation, abstraction, inheritance
C) inheritance, polymorphism, recursion
D) polymorphism, recursion, abstraction
E) none of the above
Q4) Is it possible to use both overloading and overriding in the same method?
Q5) Why would you not need to implement a ChangeListener for the JSlider?
Page 12
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Chapter 11: Exceptions
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Sample Questions
Q1) The difference between a checked and an unchecked exception is
A) checked exceptions need not be listed in a throws clause
B) unchecked exceptions must be listed in a throws clause
C) neither kind of exception follows the rules of exception propagation
D) an unchecked exception requires no throws clause
E) a checked exception always must be caught by a try block; an unchecked exception does not
Q2) If an ArithmeticException arises in the try statement in m3
A) it is caught in main
B) it is caught in m1
C) it is caught in m2
D) it is caught in m3
E) it is not caught leading to the program terminating
Q3) Write code to display the contents of the String array stuff to a JTextArea where each element of the array is placed on individual lines. Assume that no String is more than 25 characters long.
Q4) Write a set of code that will allow a user to select a file through a JFileChooser, read each item of the file, outputting each item to the screen, and close the file at the end.
Q5) 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) Recursion is a popular programming tool but beginning programmers tend to shy away from it. Why do you suppose this is True?
Q2) 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
Q3) 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
Q4) Provide a definition for the terms as they relate to programming: recursion, indirect recursion and infinite recursion.
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) One operation that we might want to implement on a Stack and a Queue is full, which determines if the data structure has room for another item to be added. This operation would be useful
A) only if the Queue or Stack is implemented using an array
B) only if the Queue or Stack is implemented using a linked list
C) only for a Queue
D) only for a Stack
E) none of the above, a full operation is not useful at all
Q2) It is possible to restrict the type of object which is stored within a Java collection by using a generic type when the collection is declared.
A)True
B)False
Q3) Assume that DoubleNode temp references the node with the value 3. Provide code to delete this DoubleNode without disconnecting the rest of the list.
Q4) Assume that head references a linked list that stores the values 3, 6 and 2. Show the instructions needed to delete the Node with 3 from the list so that head would reference the list of 6 and 2.
Q5) Draw this structure.
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