Java Final Exam

Test: Java Fundamentals Final Exam Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer. Section 4 (Answer all questions in this section) 1. Which of the following declarations are correct?

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(Choose all correct answers) double duty; (*) float loan; (*) boolean value = 12; int start = 34, 3nd = 99; Correct 2. Which line of Java code will assign the value of the square root of 11 to a variable named a?


double a=11^(1/2); double a=sqrt(11); int a=Math.sqrt(11); double a=Math.sqrt*11; double a=Math.sqrt(11); (*) Correct 3. The ______________ is the location into which you will store and save your files.


Perspective Workspace (*) Editor None of the above Correct 4. A workspace is:

The physical location onto which you will store and save your files. The location where all projects are developed and modified. The location where you can have one or more stored perspectives. All of the above. (*) Correct


5. A workspace can not have more than one stored projects. True or false?


True False (*) Correct Page 1 of 10

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Test: Java Fundamentals Final Exam Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer. Section 4 (Answer all questions in this section) 6. You can return to the Eclipse Welcome Page by choosing Welcome from what menu?


File Edit Help (*) Close Correct 7. A perspective is described as:


A combination of views and editors (*) A combination of views and windows A combination of editor tabs None of the above Incorrect. Refer to Section 4 Lesson 1. 8. Which of the following defines a driver class?


Contains a main method and other static methods. (*) Contains classes that define objects. Contains a main method, a package, static methods, and classes that define objects.

None of the above. Incorrect. Refer to Section 4 Lesson 2. 9. Which of the following defines an object class?


Contains a main method and other static methods. Contains classes that define objects. (*) Contains a main method, a package, static methods, and classes that define objects. None of the above. Correct 10.Consider the following code snippet.


What is printed? 88888 (*) 88888888 1010778 101077810109 ArrayIndexOutofBoundsException is thrown Incorrect. Refer to Section 4 Lesson 4.

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Test: Java Fundamentals Final Exam Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer. Section 4 (Answer all questions in this section) 11.Consider the following code snippet.


What is printed? Cayrbniz CayrbnizCayrbniz yr (*) ay ArrayIndexOutofBoundsException is thrown Incorrect. Refer to Section 4 Lesson 4. 12.Given the code: String s = new String("abc"); Which of the following statements will change the length of s to the largest length?


s.trim() s.replace("a", "aa") s.substring(2) s.toUpperCase() None of the above will change the length of s. (*) Correct 13.What is printed by the following code segment?


\\\\ \\\\\\\ (*) \\\\\\\\\\\\\\ \\ Correct

14.The following code is an example of creating a String reference:

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String s;

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True or false? True (*) False Correct Section 5 (Answer all questions in this section) 15.How many times will the following loop be executed? What is the value of x after the loop has finished? What is the value of count after the loop has finished?


int count = 17; int x = 1; while(count > x){ x*=3; count-=3; } 4; 8; 27 3; 27; 8 (*) 5; 27; 8 5; 30; 5 3; 9; 11 Correct

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Test: Java Fundamentals Final Exam Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer. Section 5 (Answer all questions in this section) 16. One advantage to using a while loop over a for loop is that a while loop always has a counter. True or false?


True False (*) Incorrect. Refer to Section 5 Lesson 2. 17. Updating the input of a loop allows you to implement the code with the next element rather than repeating the code always with the same element. True or false? True (*)


False Correct 18. Which of the following could be a reason to use a switch statement in a Java program?


Because it allows the code to be run through until a certain conditional statement is true. Because it allows the program to run certain segments of code and neglect to run others based on the input given. (*) Because it terminates the current loop. Because it allows the user to enter an input in the console screen and prints out a message that the user input was successfully read in. Correct 19. Determine whether this boolean expression evaluates to true or false: !(3<4&&6>6||6<=6&&7-2==6)


True (*) False Incorrect. Refer to Section 5 Lesson 1. 20. How would you use the ternary operator to rewrite this if statement? if (balance < 500)< fee = 10; else fee = 0;


fee = ( balance < 500) ? 0 : 10; fee= ( balance < 500) ? 10 : 0; (*) fee = ( balance >= 5) ? 0 : 10; fee = ( balance >= 500) ? 10 : 0; fee = ( balance > 5) ? 10 : 0; Incorrect. Refer to Section 5 Lesson 1.

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Test: Java Fundamentals Final Exam Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer. Section 6 (Answer all questions in this section) 21. Which of the following declares a one dimensional array name scores of type int that can hold 14 values?


int scores; int[] scores=new int[14]; (*) int[] scores=new scores int[14]; int score= new int[14]; Incorrect. Refer to Section 6 Lesson 1. 22. What is the output of the following segment of code? int array[][] = {{1,2,3},{3,2,1}}; for(int i=0;i<2;i++) for(int j=0;j<3;j++) System.out.print(2*array[1][1]);


444444 (*) 123321 246642 222222 This code doesn't compile. Incorrect. Refer to Section 6 Lesson 1. 23. Which of the following declares and initializes a one dimensional array that can hold 5 Object reference types?


String[] array=new String[5]; Object array=new Object[5]; (*) Object[] array=new Object[4]; String[] array=String[4]; Incorrect. Refer to Section 6 Lesson 1. 24. Which of the following statements is not a valid array declaration?


int number[]; float []averages; double marks[5]; counter int[]; (*) Correct 25. Which of the following is a sorting algorithm that involves repeatedly incrementing through the array and swapping 2 adjacent values if they are in the wrong order until all elements are in the correct order? Selection Sort Merge Sort


Bubble Sort (*) Sequential Search Binary Search Incorrect. Refer to Section 6 Lesson 2.

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Test: Java Fundamentals Final Exam Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer. Section 6 (Answer all questions in this section) 26. Which of the following is the correct lexicographical order for the conents of the int array?


{17, 1, 1, 83, 50, 28, 29, 3, 71, 22} {71, 1, 3, 28,29, 50, 22, 83, 1, 17} {83, 71, 50, 29, 28, 22, 17, 3, 1, 1} {1, 1, 17, 22, 28, 29, 3, 50, 71, 83} {1, 2, 7, 0, 9, 5, 6, 4, 8, 3} {1, 1, 3, 17, 22, 28, 29, 50, 71, 83} (*) Correct 27. Which searching algorithm involves using a low, middle, and high index value to find the location of a value in a sorted set of data (if it exists)?


Sequential Search Merge Sort Selection Sort Binary Search (*) All of the above Incorrect. Refer to Section 6 Lesson 2. 28. Big-O Notation is used in Computer Science to describe the performance of Sorts and Searches on arrays. True or false?


True (*) False Incorrect. Refer to Section 6 Lesson 2. 29. A logic error occurs if an unintentional semicolon is placed at the end of a loop initiation because the interpreter reads this as the only line inside the loop, a line that does nothing. Everything that follows the semicolon is interpreted as code outside of the loop. True or false?


True False (*) Correct Section 7 (Answer all questions in this section) 30. If a variable in a superclass is private, could it be directly accessed or modified by a subclass? Why or why not?


Yes. A subclass inherits full access to all contents of its super class. Yes. Any variable passed through inheritance can be changed, but private methods cannot. No. A private variable can only be modified by the same class with which it is declared regardless of its inheritance. (*) No. Nothing inherited by the super class can be changed in the subclass. Correct

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Test: Java Fundamentals Final Exam Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer. Section 7 (Answer all questions in this section) 31. Which of the following is the correct way to call an overriden method needOil() of a super class Robot in a subclass SqueakyRobot?


Robot.needOil(SqueakyRobot); SqueakyRobot.needOil(); super.needOil(); (*) needOil(Robot); Incorrect. Refer to Section 7 Lesson 4. 32. An access modifier is a keyword that allows subclasses to access methods, data, and constructors from their parent class. True or false?


True (*) False Correct 33. What is encapsulation?

A keyword that allows or restricts access to data and methods. A programming philosophy that promotes simpler, more efficient coding by using


exiting code for new applications. A structure that categorizes and organizes relationships among ideas, concepts of things with the most general at the top and the most specific at the bottom. A programming philosophy that promotes protecting data and hiding implementation in order to preserve the integrity of data and methods. (*) Correct 34. Any instance of the same class can assign a new value to a static variable. True or false?


True (*) False Correct 35. Static methods can change instance variables at run-time. True or false?


True False (*) Incorrect. Refer to Section 7 Lesson 3.

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Test: Java Fundamentals Final Exam Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer. Section 7 (Answer all questions in this section) 36.A base case can handle nested conditions. True or false?


True (*) False Correct 37.If we override the toString() method with the code below, what would be the result of printing?


It would print the array one element at a time. The console screen would display: 0 18 215 64 11 42 It would print the string returned from the method. The console screen would display: [0,18,215,64,11,42,] (*) It would print the array backwards. The console screen would display: 42 11 64 215 18 0 It would print the string returned from the method. The console screen would display: {0, 18, 215, 64, 11, 42} Correct 38.Identify the correct way to declare an abstract class.


abstract public class ClassName{...} public abstract ClassName(...) public class abstract ClassName(...) public abstract class ClassName{...} (*) Incorrect. Refer to Section 7 Lesson 5. 39.If a class is immutable then it must be abstract. True or false?


True False (*) Incorrect. Refer to Section 7 Lesson 5. 40.A class can only have one constructor. True or false?


True False (*) Incorrect. Refer to Section 7 Lesson 1.

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Test: Java Fundamentals Final Exam Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer. Section 7 (Answer all questions in this section) 41.What value will return for j when the setValue method is called?


31 32 10 11 (*) Incorrect. Refer to Section 7 Lesson 1. 42.What is the output of the following code segment: int n = 13; System.out.print(doNothing(n)); System.out.print(" ", n);


where the code from the method doNothing is: public double doNothing(int n) { n = n + 8; return (double) 12/n; } 1.75, 13 0.571, 21 1.75, 21 0.571, 13 (*) Incorrect. Refer to Section 7 Lesson 1. 43.What is true about the code below: Car car1=new Car(); Car car2=new Car(); car2=car1; (Choose all correct answers) The references car1 and car2 are pointing to two Car Objects in memory. The reference car2 points to an exact copy of the Car Object that car1 references. (*)


There are no more Car objects in memory. There is a Car object that car1 referenced that is now slated for removal by the garbage collector. There is a Car object that car2 referenced that is now slated for removal by the garbage collector. (*) Incorrect. Refer to Section 7 Lesson 1. 44.Which of the following calls the method calculate correctly?


ThisClass t=new ThisClass(); int x=t.calculate(3,4); (*) int x=calculate(3,4); ThisClass t=new ThisClass(); int x=t.calculate(3); ThisClass t=new ThisClass(); int x=t.calculate(); Correct 45.What is wrong with the following class declaration? class Account{ ; private int number; private String name;; public Account; } Classes cannot include strings. Classes cannot include mixed data types. The constructor method has no definition. (*) There is nothing wrong. Correct

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Test: Java Fundamentals Final Exam Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer. Section 7 (Answer all questions in this section)


46. Which of the following specifies accessibility to variables, methods, and classes?


Methods Parameters Overload constructors Access modifiers (*) Correct 47. Which of the following correctly defines overloading?


Having more than one constructor with the same name but different arguments. (*) Having more than one constructor with different names and the same arguments. A variable argument method that returns an array. A type of access specifier that only allows access from inside the same class. Incorrect. Refer to Section 7 Lesson 2. 48. Which of the following is the correct definition of a parameter?


A keyword that specifies accessibility of code. A way to call a method with a variable number of arguments using an elipse. A variable in a method declaration that gets passed into the method. (*) A type of access specifier. It is used to assign initial values to instance variables of a class; the structure is very similar to that of a method. Correct 49. Which segment of code represents a correct way to call a variable argument method counter that takes in integers as its variable argument parameter?


counter(String a, int b); counter(int[] numbers); counter(1, 5, 8, 17, 11000005); (*) counter("one","two",String[] nums); Incorrect. Refer to Section 7 Lesson 2. 50. Which of the following is the definition of a constructor?

A keyword that specifies accessibility of code. A special method that is used to assign initial values to instance variables in a class. (*)


A way to call a method with a variable number of arguments using an elipse. A variable in a method declaration that gets passed into the method. Incorrect. Refer to Section 7 Lesson 2.

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Java Final Exam

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