UoPeople CS 1102-01 Programming 1 - AY2024-T4 Review Quiz Answers -

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Question 1

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Question text

Which of the following is not a valid Java identifier?

a.

myVariable

b.

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_variable

c.

123variable

d.

$variable

Question 2

Correct

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Question text

Which interface in the Collection Hierarchy maps keys to values and does not allow duplicate keys?

a.

List

b.

Set

c.

Map

d.

Iterator

Question 3

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Question text

What is the purpose of method overloading in Java?

a.

To override superclass methods with more specific implementations.

b.

To create multiple methods with the same name but different parameters.

c.

To limit the number of methods in a class.

d.

To restrict method access to subclasses only.

Question 4

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Which of the following is the correct way to declare and initialize an array in Java?

a. int[ ] numbers = new int[5] {1, 2, 3, 4, 5};

b. int[ ] numbers = {1, 2, 3, 4, 5};

c. int numbers[ ] = new int[ ]{1, 2, 3, 4, 5};

d. int numbers = [1, 2, 3, 4, 5];

a.

Option a and Option b

b.

Option b and Option c

c.

Option c

d.

Option b

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Question 5

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Question text

What is the result of the following code snippet?

int x = 10;

int y = 5;

boolean result = (x > y) && (x != y);

System.out.println(result);

a.

True

b.

False

c.

10

d.

5

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Question 6

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What is the purpose of the Iterator interface in the Collection Hierarchy?

a.

To provide a way to iterate over the elements of a collection

b.

To enforce immutability on the collection

c.

To define a generic type for the collection

d.

To enable parallel processing of the collection

Question 7

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Which of the following statements is true about static nested classes?

a.

They can access non-static methods and variables of the outer class directly.

b.

They can be instantiated without an instance of the outer class.

c.

They can only be declared within static methods.

d.

They can be inherited by the subclasses of the outer class.

Question 8

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What is the output of the following code snippet?

for (int i = 0; i <= 10; i += 2) {

System.out.print(i + ” “);

}

a.

0 2 4 6 8 10

b.

2 4 6 8 10

c.

0 2 4 6 8

d.

2 4 6 8

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Question 9

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What is the output of the following code snippet?

int[ ] numbers = new int[5];

System.out.println(numbers[3]);

a.

0

b.

null

c.

error

d.

ArrayIndexOutOfBoundsException

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Question 10

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Question text

In OOP, what is the purpose of the “this” keyword?

a.

To reference the current object within a method

b.

To declare a variable with class scope

c.

To instantiate a new object

d.

To define a constructor for the class

Question 11

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What happens when an instance variable with the same name as a static variable is declared in a class?

a.

The instance variable shadows the static variable.

b.

The static variable shadows the instance variable.

c.

Both variables are accessible without any conflict.

d.

It causes a compilation error.

Question 12

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Question text

In Java, method overloading allows developers to:

a.

Override a method inherited from a superclass.

b.

Define multiple methods with the same name but different return types.

c.

Define multiple methods with the same name but different access modifiers.

d.

Define multiple methods with the same name but different parameters.

Question 13

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Which of the following code snippets correctly demonstrates the creation of an object in Java?

a.

new Object();

b.

Object obj = Object();

c.

Object obj = new Object;

d.

Object obj = new Object();

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Question 14

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Which of the following is the correct way to declare a constant variable in Java?

a.

final int PI = 3.14;

b.

const int PI = 3.14;

c.

int PI = 3.14;

d.

static int PI = 3.14;

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Question 15

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Which of the following is an advantage of using static methods and variables?

a.

They allow for better encapsulation and information hiding.

b.

They can be overridden in the subclass for polymorphism.

c.

They can be accessed without creating an instance of a class.

d.

They allow for dynamic binding and late binding.

Question 16

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In Java, what is the benefit of using inheritance?

a.

It allows for code reuse and promotes a hierarchical structure.

b.

It eliminates the need for polymorphism.

c.

It makes code more complex and harder to maintain.

d.

It reduces the performance of the program.

Question 17

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What is the output of the following code snippet?

int i = 0;

do {

if (i == 3)

continue;

System.out.print(i + ” “);

i++;

} while (i < 5);

a.

0 1 2 3 4

b.

1 2 3 4

c.

0 1 2

d.

0 1 2 3

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Question 18

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Question text

Which JavaFX class is used to display a web page?

a.

WebView

b.

WebPane

c.

WebDisplay

d.

WebBrowser

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Question 19

Correct

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Question text

Which keyword is used to prevent a method from being overridden in the subclass?

a.

final

b.

static

c.

abstract

d.

private

Question 20

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Question text

What is the output of the following code snippet?

int i = 0;

outer:

while (i < 5) {

inner:

for (int j = 0; j < 3; j++) {

if (i == 3)

break outer;

if (j == 2)

continue inner;

System.out.print(i + j + ” “);

}

i++;

}

a.

0 1 2 3 4 5 6 7

b.

0 1 1 2 2 3

c.

0 1 2 3 4 5

d.

0 1 2 4 5 6 7 8

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Question 21

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Question text

How are constructors used in object-oriented programming?

a.

To define attributes and methods of an object

b.

To allocate memory for object variables

c.

To initialize object attributes with predefined values

d.

To establish communication between classes

Question 22

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Question text

What is the output of the following code snippet?

ArrayList<String> fruits = new ArrayList<>();

fruits.add(“Apple”);

fruits.add(“Orange”);

fruits.add(“Banana”);

System.out.println(fruits.size());

a.

1

b.

2

c.

3

d.

0

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Question 23

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Question text

Which of the following statements about inheritance and polymorphism is true in Java?

a.

Inheritance and polymorphism are independent concepts and do not impact each other.

b.

Inheritance is a prerequisite for polymorphism.

c.

Polymorphism can only be achieved through method overloading.

d.

Inheritance and polymorphism cannot be used together in the same program.

Question 24

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What is the output of the following code snippet?

int x = 5;

int y = 2;

int result = x % y;

System.out.println(result);

a.

3

b.

2

c.

1

d.

0

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Question 25

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Question text

To differentiate between a static method and a non-static (instance) method, you would primarily:

a.

Test their execution time

b.

Verify their return type

c.

Determine their association with class or instances

d.

Relate them to their superclass

Question 26

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Question text

How can you create a tool tip in Java Swing?

a.

By calling the setToolTipText() method on the component and passing the tool tip text.

b.

By creating an instance of the ToolTip class and setting its text property.

c.

By calling the addToolTip() method on the component and passing a ToolTip object.

d.

By using the ToolTipManager class to manage tool tips for the component.

Question 27

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Question text

What is the purpose of a JavaFX scene graph?

a.

It defines the structure and layout of a user interface.

b.

It represents the hierarchical structure of all the visual elements in a JavaFX application.

c.

It manages the rendering and animation of visual elements in a JavaFX application.

d.

It handles all the user events and actions in a JavaFX application.

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Question 28

Correct

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Question text

Which layout manager in Java Swing allows components to be arranged in a stack-like manner?

a.

FlowLayout

b.

BorderLayout

c.

CardLayout

d.

BoxLayout

Question 29

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Question text

The process of defining a new class based on an existing class is known as:

a.

Inheritance

b.

Polymorphism

c.

Encapsulation

d.

Abstraction

Question 30

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Question text

Which method is used to replace the element at a specific index in an ArrayList in Java?

a.

set()

b.

replace()

c.

modify()

d.

assign()

Question 31

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Question text

Which access modifier allows a class member to be accessed only within the same class?

a.

public

b.

private

c.

protected

d.

default (no modifier)

Question 32

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Question text

What is the output of the following code snippet?

int[] numbers = {5, 2, 7, 1, 8};

Arrays.sort(numbers);

System.out.println(numbers[2]);

a.

5

b.

7

c.

2

d.

1

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Question 33

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What is the output of the following code snippet?

int[ ] numbers = {5, 2, 8, 1, 3};

Arrays.sort(numbers);

System.out.println(numbers[0]);

a.

1

b.

2

c.

3

d.

5

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Question 34

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Question text

Which method of the Thread class is used to check if a thread is still active and running?

a.

isAlive()

b.

isActive()

c.

isRunning()

d.

isExecuting()

Question 35

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Question text

Which Stream API operation is used to apply a function to each element and transform it into another element?

a.

map()

b.

filter()

c.

reduce()

d.

collect()

Question 36

Correct

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Question text

Which interface in the Collection Hierarchy allows duplicate elements and maintains insertion order?

a.

List

b.

Set

c.

Map

d.

Iterator

Question 37

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Question text

When using a do-while loop, the code block is executed:

a.

zero or more times

b.

at least once

c.

based on a specific condition

d.

until the loop variable reaches a certain value

Question 38

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Question text

What is the significance of inheritance in object-oriented programming?

a.

It allows objects to communicate with each other.

b.

It ensures that attributes and methods are defined within a class.

c.

It enables the creation of subclasses that inherit characteristics from a parent class.

d.

It facilitates the encapsulation of data and behavior within objects.

Question 39

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Question text

Which JavaFX class is used to display text and images?

a.

Text

b.

Label

c.

Button

d.

Image

Question 40

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Question text

Which keyword is used to skip the remaining code in the loop and continue with the next iteration?

a.

exit

b.

skip

c.

break

d.

continue