JFo Java Foundations Final Exam

 

1. Looping continues as long as the boolean expression in the for loop is false.

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Correct

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2. The initialization expression initializes the loop and it is executed only once, as the loop begins.

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Incorrect. Refer to Section 6 Lesson 1.

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3. Each expression in the header section of a for loop is optional.

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Correct

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4. A for loop is also called a definite loop

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Incorrect. Refer to Section 6 Lesson 1.

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5. A continue statement is used to skip the remaining statements in the body of a loop and continue with the next iteration of the loop.

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6. The purpose of adding comments is to increase the ability to understand the logic easily.

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7. Which of the two are pre-test loops?

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forEach

while (*)

for (*)

do-while

Correct

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8. A while loop is often used with Scanner input as you don't know many times you'll need to re-prompt the user if they type bad data.

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9. A pre-test loop evaluates the condition prior to execution of the loop.

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Section 7

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10. You have created an Employee class with all required fields and methods. 10 employees join the company. Should you copy and paste the Employee class for all 10 employees?

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11. Variables created within a method can be accessed outside that method.

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12. Which two statements are true about the main method?

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The main method should be as simple as possible. (*)

The main method should be able to freely manipulate an object’s fields.

The main method should store the properties and behaviors of objects.

The main method is commonly used to instantiate objects. (*)

Correct

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13. An object must be instantiated before its non-static fields and methods can be accessed.

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14. You never need to instantiate a Math object.

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15. Which two are access modifiers?

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final

static

public (*)

private (*)

Correct

16. Which two statements are true?

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An object can access another object’s public fields. (*)

An object can access another object’s public constructor.

An object can access another object’s public methods. (*)

An object can access another object’s main method.

Correct

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17. What is encapsulation?

A technique for debugging.

A technique for limiting one class’s visibility to another. (*)

A technique for including primitives within an ArrayList.

A technique for writing more than one main method.

Correct

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18. You can write more than one constructor in a class.

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19. Which statement is true?

The default constructor can accept arguments.

You must write at least one constructor in your class.

A constructor can be written to accept arguments. (*)

The default constructor is still available when you add your own constructor.

Incorrect. Refer to Section 7 Lesson 4.

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20. Method overloading can be a useful technique for defining methods with similar functionality or calculations.

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Correct

21. In this statement, identify the type of the variable s.

Student s = new Student();

String

Class

Student (*)

null

Correct

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22. Objects are stored within the heap memory.

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23. Which type of memory is allocated for the code below?

int x = 1;

int y = 2;

x=y;

Stack memory (*)

No memory is allocated

PileDriver memory

Heap memory

Correct

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24. How could you write the Employee constructor so that its parameters are named the same as the fields they’re initializing?

public class Employee{

   private String name;

   private double salary;

   public Employee(String name, double salary){

     //initialize name

     //initialize salary

   }

}

public Employee(String name, double salary){

   name = name;

   salary = salary;

}

public Employee(String name, double salary){

   name = this.name;

   salary = this.salary;

}

public Employee(String name, double salary){

   this.name = name;

   this.salary = salary;

} (*)

public Employee(String name, double salary){

   this.name = this.name;

   this.salary = this.salary;

}

Correct

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25. Which has a default value of null?

boolean

int

String (*)

double

Correct

26. Which two statements are NOT true about constructors?

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A constructor method may return a value. (*)

A constructor method is called once for each instance of an object.

The constructor method is called during instantiation.

A constructor method has a void return type. (*)

Correct

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27. How would you instantiate the Employee class from a main method located in another class?

public class Employee{

   private String name;

   private double salary;

   public Employee(String n, double s){

     name = n;

     salary = s;

   }

}

Employee emp1 = new Employee();

Employee emp1 = new Employee(50000);

Employee emp1 = new Employee(50000, "Syam");

Employee emp1 = new Employee("Syam", 50000); (*)

Correct

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28. A constructor is a special method which is commonly used to set the initial values of an object’s fields.

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Section 8

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29. Runtime errors can be caught by Java’s exception handling mechanism.

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30. Testing and debugging are important activities in software development.

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31. Using a Java debugger, you can set breakpoints and trace through a program one line at a time.

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32. What are two disadvantages of adding print statements for debugging?

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Too many print statements lead to information overload. (*)

Print statements cannot print the values of variables.

It’s tedious to remove print statements. (*)

Print statements cannot print the values of an object’s fields.

Correct

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33. Given:

int x[];

What is the value of x?

Some random number.

0

null (*)

1

Correct

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34. Arrays are like variables which must be declared prior to use.

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35. What is the starting index of an array?

0 (*)

You can start with anything

It depends on the type of the array.

1

Correct

36. What is an array?

An array is a way to create multiple copies of a single value.

An array is an indexed container that holds a set of values of a multiple types.

An array is an indexed container that holds a set of values of a single type. (*)

An array is a Java primitive type.

Correct

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37. Which two cannot be stored in an ArrayList?

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Integer

float (*)

int (*)

String

Correct

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38. A wrapper class encapsulates, or wraps, the primitive types within an object.

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39. Which is not used to traverse an ArrayList?

for-each loop

iterator

ListIterator

do- while loop (*)

Incorrect. Refer to Section 8 Lesson 2.

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40. How could you declare an ArrayList so that it can store true or false values?

ArrayList<True, False> arrList = new ArrayList<>();

ArrayList<true, false> arrList = new ArrayList<>();

ArrayList<Boolean> arrList = new ArrayList<>(); (*)

ArrayList<boolean> arrList = new ArrayList<>();

Correct

41. Each catch block is an exception handler that handles the type of exception indicated by its argument.

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42. What happens when you don’t handle an exception?

The execution of the program is terminated abruptly. (*)

The program encounters error and simply ignores it.

A message is printed to the console to ask you how to handle the error.

All of the code after the error is skipped, but the program still runs.

Correct

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Section 9

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43. Which is not a JavaFX Node?

Object (*)

ImageView

ScrollBar

Button

Correct

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44. A layout Pane dictates how Nodes must be positioned

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45. Which type of Root Node allows Nodes to be placed anywhere?

Group (*)

StackPane

HBox

TilePane

Correct

46. The JavaFX API contains descriptions of Java FX features.

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47. Which is the correct syntax to instantiate a JavaFX Rectangle?

Rectangle rect = new Rectangle(20, 20);

Rectangle rect = new Rectangle(20, 20, 100);

Rectangle rect = Rectangle(20, 20, 100, 200, 200);

Rectangle rect = new Rectangle(20, 20, 100, 200); (*)

Correct

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48. Lambda Expressions provide much more effective and cleaner syntax for working with GUI applications and sorting lists.

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49. Audio can be played by referencing the AudioClip object directly.

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50. JavaFX doesn’t provide you with UI elements, shapes and text. So you must always create your own graphics.

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