Tina Comston Comp-111 Final Exam Franklin University

Final Exam

Exam - to be taken during Week 15 (no later than Wednesday) Proctor I am assuming you will be using the same proctor as for Exam 2.  If this is an incorrect assumption, please let me know ASAP. Preparing for the exam Review the readings for the entire course with particular focus Weeks 11 - 14. Review the Key Points for entire course with particular focus on Modules 11 - 14. Exam Format multiple choice questions (3pts each) True/False (2pts each) Definitions (2pts each) Short answer/coding questions (various point assignments)

Exam Practice Questions

• Chapter 1 

•  Describe the various operations performed by the CPU.

•  Describe the different between primary and secondary storage.  Be able to provide an example of each.

•  What is an algorithm?

•  What is psuedo code?

• Describe both syntax and logic errors.

• What are the operations performed by the central processing unit (CPU)?

• What are the two most important benefits of the Java language?

• What is the file extension for a java source file?  What is the file extension for a compiled java file? How do you compile/call a java executable from the command line?

• What will be the output of the following statements:
• String firstWord = "Hello!";
• String secondWord = "Study";
• String thirdWord = "hard.";
• String newSentence = firstWord + secondWord + thirdWord;
• System.out.println(newSentence);

• Evaluate the following code:
• String firstWord = "Hello!"
• secondWord = "Study";
• String thirdWord = "hard.";
• String newSentence = firstWord & secondWord + thirdWord;
• System.out.println(newSentence);

• Identify the syntax errors.  (There are 3.)
• Identify the logic errors. (There are 2.)

• What is the difference between the System.out.println() and System.out.print() methods?

• What is the purpose of a compiler?  a processor?

• Chapter 2
• What are the primitive data types in Java?

• Which of the following are object data types and which are primitive data types?
• int
• String
• double
• Rectangle
• boolean
• char
• Location

• What is an object?
• What is an object reference?
• What is an object variable?
• What is a class?
• What is a method?
• What is a variable?

• What is an instance variable?  Should an object be manipulated by directly accessing its instance variables? What is the lifetime of an instance variable?

• Evaluate the following statement:
• myAccount.deposit(payCheck);
• Identify the object(s), method(s), parameter(s)
• How many total parameters (implicit and explicit) are there?
• Is there an implicit parameter? If yes, what is it?
• Is there an explicit parameter(s)?  If yes, what is it?

• How many parameters, both implicit and explicit are in the following statements, assuming String tmpString = "Hello Class!; ?
• String newString = tmpString.substr(1, 3);
• String upperString = tmpString.upperCase();
• boolean isEqual = tmpString.equals("Hello Class!");

• Evaluate the following statement:
• public void deposit( double inAmount)
• Is this an accessor or mutator method?  How can you tell?
• Does this method return a value?  If yes, what type is the return value?
• Does this method accept explicit input parameters?  If yes, what type(s) is the parameter(s)?

• Describe the purpose of a constructor.  What is the difference between a default constructor and an explicit constructor?  What return type is specified for a constructor?

• Given the following definition statements for constructors - create a new object instance.
• public Dog()
• public Car(String inMake, String inColor, int inMPG)
• public House(double inLatititude, double inLongitude, String inColor)

• Consider the following java code:
• Car newCar1 = new Car("Chevy", "Blue", 32);
• Car newCar2 = new Car(newCar1);
• How many objects are created?
• Are the instance variables referred to by newCar1 the same as the instance variables referred to by newCar2?

• Consider the following java code:
• Car newCar1 = New Car("Chevy", "Blue", 32);
• Car newCar2 = newCar1;
• How many objects are created?
• Are the instance variables referred to by newCar1 the same as the instance variables referred to by newCar2?

• What makes a valid Java identifier?

• Reviewing each of the following variable names - do any of them violate Java syntax?  violate Java convention?
• tmpStation
• return 
• noMore?
• TmpStation 

• Which variable type would be used for the following data?
• GPA
• name
• age (in years)
• batting average
• football score
• customer address

• What will be the output of the following:
• System.out.print("COMP");
• System.out.println("111");
• System.out.print(" is a ");
• System.out.println("great class.");

• Chapter 3
• Describe abstraction, encapsulation, and black box.

• Describe the purpose of a constructor.  What is the difference between a default constructor and an explicit constructor?  What return type is specified for a constructor?

• What is an instance variable?  Should an object be manipulated by directly accessing its instance variables? What is the lifetime of an instance variable?

• How is an implicit parameter denoted within a class?

• What are the basic steps for testing a method?   How do you write an assert statement to test a method that returns an integer value?  a double value?  a string value?

• What is a local variable?  What is the lifetime of a local variable?

• What is a unit test?

• What is regression testing?

• What are javadocs?  How is a javadoc created?  What parameters can be specified for a javadoc? 

• How many parameters, both implicit and explicit are in the following statements, assuming String tmpString = "Hello Class!; ?
• String newString = tmpString.substr(1, 3);
• String upperString = tmpString.upperCase();
• boolean isEqual = tmpString.equals("Hello Class!");

• What are the basic steps for testing a method?   How do you write an assert statement to test a method that returns an integer value?  a double value?  a string value?

• Chapter 4
• What will be the result of the following equation?

• Evaluate the following statement, assuming that initially a = 10 and b = 11.
• c = a + b++;
• What will a be equal to after this statement is executed?
• What will b be equal to after this statement is executed?
• What will c be equal to after this statement is executed?

• How is input received from the console?  What object needs to be declared?  How is integer data accepted? double data accepted? string data accepted?

• Describe final and static with regards to defining variables.

• Define a constant variable with a name of MINS_PER_HR set equal to the value 60.

• Assuming that you need to generate a class and objects to represent the following - what class would be needed and how many objects should be created of each.
• orange - 15 oranges
• banana - 10 bananas
• papaya - 5 papayas

• Evaluate each of the following statements and determine the number type.  Will the statement successfully compile?
• int tmpNum = 40;
• double tmpNum = 40.0;
• int tmpNum = 40.0;
• double tmpNum = 40;

• Consider the following equation:
• double battingAverage = 2.81;
• int avgRounded = battingAverage;
• What value will avgRounded contain?  Or will an error result?

• What is the first index position of a string?

• In the .substring(int, int) method:
  • What does the first explicit parameter represent?  
  • What does the second explicit parameter represent?  
  • What element position is the first element position in a string?  
  
  
• Using the .substring() method, write the code to do the following for the String variable testString.
• return just the first character  
• return just the last character 
• remove the first character from the string  
• remove the last character from the string  

• Evaluate the following statements:
• String quote = “study very hard”;
• System.out.println(quote.substring(4, 9));
• Identify the object(s), method(s), parameter(s)
• Is there an implicit parameter? If yes, what is it?
• Is there an explicit parameter(s)?  If yes, what is it?
• What will be the output of these statements?

• Evaluate the following statement:
• String output = "Value" + 7/3";
• What will be the output of this statement?
  

• How is input received from the console?  What object needs to be declared?  How is integer data accepted? double data accepted? string data accepted?

• Write a loop that prompts for and reads the names of everyone in your family and inserts them into an array list.  The loop should continue to prompt until the sentinel value of Q is entered.  Write a second loop that prints out the members of your family in the opposite order from which they were entered.

• Chapter 5

• What comparison operator is used to compare 2 integer values?  

• Can you use the == comparison operator to compare 2 floating point or double values?

• What is the purpose of an IF statement?

• Evaluate the following statement:
• if ( x == 12 || 8 )
• Is this a valid statement?  Will it successfully compile?
• Why or why not?

• Evaluate the following statement:
• if (!input.equals("R") || !input.equals("T"))
• System.out.println("Input is: " + input);
• What will be printed if input is equal to "R"?
• What will be printed if input is equal to "T"?
• What will be printed if input is equal to "Q"?

• Evaluate the following statement, assuming that quote1 and quote2 are both data type String.
• quote1.compareTo(quote2)
• What will be returned if the two String objects are equal?
• What will be returned if quote1 is alphabetically before quote2?
• What will be returned if quote2 is alphabetically before quote1?

• Assuming P is true, Q is false and R is true, what will be the result of:
• P && Q  
• P || Q 
• !(P && R) 
• !(P || R) 

• What is code coverage?
• What is black box testing?
• What is white box testing?

• Describe final and static with regards to defining variables.

• Write the code to test gender of an employee printing "Male" if the employee has a gender of M and "Female" if the employee has a gender of F.  Print "Unknown" if neither M or F.  The employee gender can be retrieved through the get method getGender().  The gender value returned is data type char.

• Write the code to test the age of an employee.  Use the getAge() method to retrieve the age which returns an integer value.  Print the following:
• If the age is less than 25 print "youngster"
• If the age is greater than or equal to 25 and less than 35 print "Generation X".
• If the age is greater than or equal to 35 and less than 45 print "Generation Y".
• If the age is greater than or equal to 45 print "Baby Boomer".

• How are unit tests in Test Driven Development generally developed?
• When should they be developed?

• Chapter 6

• What is a sentinel value?

• Evaluate the following statements:
• boolean stopLoop = false;
• int ctr = 0;
• while (stopLoop)
• {
•    if (ctr++ > 12)
•    {
•       System.out.println(ctr);
  
•       stopLoop = true;
•    }
• }
  
• How many times will this loop execute?
• What will be the output from this loop?

• Describe the four types of loops.  When would each be used?

• Can a for loop be rewritten as a while loop?  As a do/while loop?

• What are the four parts of a loop?

• Write the loop statement to print the value for each element in an array of type String named dogs.
• Write the statement using the for loop.
• Write the statement using the enhanced for loop.

• Write the code segment to prompt a user for entry of a double value until a sentinel value of -99.99 is entered.  After the sentinel value, compute the average of the numbers entered.

• How many interations doe the following loops carry out?
• for (int i = 0; i <= 20; i++)
• for (int i = 50; i > 0; i--)
• for (int i = -20; i <= 10; i++)
• for (int i = 75; i >= 50; i++)
• for (int i = 60; i <= 100; i = i + 2)

• Evaluate the following code:
• Random generator = new Random();
• int newNumber = 5 + generator.nextInt(10);
• What possible values will the random number generater return based upon the above explicit paramter of 10?
• What possible values will the integer variable newNumber contain after these statements execute?

• Write the statements to generate a random number that represents a roll of a die.  Where each side of the die is represented by the numbers 1 through 6, the 1 is number 1, the 2 is number 2, etc.

• What is a debugger?

• What happens when a breakpoint is set for a particular line of a program when that program is executed?

• What is single step?

• Chapter 7

• Describe wrapper and autoboxing.  What are the wrapper classes for int, double, boolean, and char.
• How do you convert a String variable to an integer using the wrapper class?  
• How do you convert a String variable to a double using the wrapper class?

• Evaluate the following statement, assuming that testArray is defined with a length of 10 and a data type of double.
• testArray[10] = 104.89;
• What are the boundaries of the array?
• Is the double value being inserted within the boundaries?
• Will this statement compile?  If no, why not?
• Will an error be produced at run time? if yes, what error?

• Describe an array verses and ArrayList.  What are the advantages and disadvantages of both?  How is a copy made of an array or ArrayList?  What type of class is an ArrayList?  What methods are available with an ArrayList?

• Write the following declaration statements:
• Declare an array of 100 Coin objects with a name of tmpCoin.
• Declare an array of 50 int values with a name of dogs.
• Declare an array of 75 Rat objects with a name of compRats.
• Declare a 4 element integer array with a name of scores, and assign the whole numbers 1 through 4 to the array elements.
• Declare an ArrayList of data type String and a name of employees.
• Declare an ArrayList of Paycheck objects with a name of annualPay.

• How do you return the length of a 
• String?
• array?
• ArrayList?

• • How do you know how many elements within an array have been populated?
  
  
  • Write the code to populate an ArrayList with the numbers 0 through 85, where each element is the array list is assigned 1 number.  The first element is assigned 0, the second assigned 1, and so on.
    • Write the code using a for loop.
    • Write the code using a while loop.
    • Write the code using a do/while loop.
    
    What is the purpose of the enhanced for loop?
  
  
  • Assuming you have an array list of data type string named dogs, write an enhanced for loop to read the entire array list and print out the content of each array element.
  
  
• Declare a two-dimensional array that has 3 rows and 4 columns of integer values with a name of testScores.
• Write a loop to populate each element within the array with a value of 0.

• Chapter 8

• What is an actor class?
• What does an actor class model, a noun or a verb?

• What is a library class?

• What is a utility class?

• What is cohesion?
• When designing a class is high or low cohesion desirable?

• What is coupling?
• When designing a package (group of classes) is high or low coupling desirable?

• Viewing the following UML diagram, what classes are dependent upon other classes?
• 

• What is an immutable class?
• What is a mutator class?

• What is a side effect?

• What is a precondition?
• What is a postcondition?

• Would a JUnit assert method be best to test a precondition or postcondition?

• What is a static method?
• Can static methods accept an implicit parameter?

• What is a static variable?
• Does a static variable belong to a class or to an object?

• Where is a local variable defined?
• When does a local variable cease to exist?
• Can a local variable have the same name as an instance variable?
• If it can, which variable will be used?

• Identify the local variables in the following code:
• public void calcSomething(double inNum1, int inNum2)
• {
• double newNum1 = 0.0;
• int newNum2 = 0;
• for (int i = 0; i < 100; i++)
• {
• if (i %2 = 0)
• {
• double tmpNum1 = inNum1 + inNum2)
• }
• }
• }

• What is a package?

• Review the following code:
• // instance variable
• private String zipCode;
• public void setZipCode(zipCode)
• {
• zipCode = "43215";
• }
• Will the instance variable zipCode or the explicit parameter zipCode be set equal to the value "43215"?
  

• Review the following code.  While definitions of tmp are legal, meaning they will compile? And which are illegal, meaning they will not compile?
• public class X
• {
• private String tmp;
• public String method1()
• {
• String tmp = "hello";      is this legal?
• return tmp;
• }
• public void method2(String next)
• {
• int ctr = 0;
• boolean tmp = true;      is this legal?
• while (tmp)
• {
• ctr++;
• if (ctr > 10) tmp = false;
• }
• }
• public void method3(String tmp)    is this legal?
• {
• int ctr = 0;
• boolean tmp = true;      is this legal?
• while (tmp)
• {
• ctr++;
• if (ctr > 10) tmp = false;
• }
• }
• public String method4(String tmp)
• {
• if (tmp.equals("hello")
• {
• String tmp = "new value";    is this legal?
• return tmp;
• }
• }

• Chapter 12
• When viewing a task description, what do the nouns represent?  What do the verbs represent?

• Chapter 14

• What is a sorting algorithm?
• How does the insertion sort work?
• How does the bubble sort work?
• How does the merge sort work?
• How does the selection sort work?

• What are the 2 ways in which complexity is usually measured in computer science?

Solution to above