Question 1

What is the purpose of the 'size()' method in Java ArrayList?

Accepted Answer

To return the number of elements in the ArrayList

Answer

To add an element at a specific index in the ArrayList

Answer

To check if the ArrayList is empty

Answer

To remove all elements from the ArrayList

Question 2

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

Accepted Answer

set()

Answer

get()

Answer

clear()

Answer

add()

Question 3

What is the purpose of the 'remove()' method in Java ArrayList?

Accepted Answer

To remove the element at a specific index in the ArrayList

Answer

To clear all elements from the ArrayList

Answer

To add an element at a specific index in the ArrayList

Answer

To check if an element exists in the ArrayList

Question 4

Which class in Java is used to create objects and define their properties and behaviors?

Accepted Answer

Class

Answer

Method

Answer

Object

Answer

Instance

Question 5

What is the difference between a one-dimensional array and an ArrayList in Java?

Accepted Answer

An ArrayList can dynamically resize, while a one-dimensional array has a fixed size

Answer

An ArrayList can only store primitive data types, whereas a one-dimensional array can store objects

Answer

An ArrayList is a primitive data type, while a one-dimensional array is an object

Answer

A one-dimensional array can only be accessed using a loop, while an ArrayList can be accessed with direct methods

Question 6

In Java, what is the purpose of the 'Math.sqrt()' method?

Accepted Answer

To calculate the square root of a number

Answer

To calculate the power of a number

Answer

To generate a random number

Answer

To round a number to the nearest integer

Question 7

What is the purpose of the 'clear()' method in Java ArrayList?

Accepted Answer

To remove all elements from the ArrayList

Answer

To add an element at a specific index

Answer

To check if the ArrayList is empty

Answer

To retrieve an element at a specific index

Question 8

Which method in Java is used to check if an ArrayList is empty?

Accepted Answer

isEmpty()

Answer

get()

Answer

contains()

Answer

size()

Question 9

In Java, which method is used to add an element at a specific index in an ArrayList?

Accepted Answer

add()

Answer

set()

Answer

remove()

Answer

clear()

Question 10

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

Accepted Answer

get()

Answer

remove()

Answer

set()

Answer

clear()

Question 11

Which method in Java Array is used to get the value at a specific index?

Accepted Answer

arrayName[index]

Answer

arrayName.length()

Answer

arrayName.remove(index)

Answer

arrayName.add(value)

Question 12

In Java, which method is used to add an element to the end of an ArrayList?

Accepted Answer

add(element)

Answer

get(index)

Answer

remove(element)

Answer

set(index, element)

Question 13

Which method in Java is used to clear all elements from an ArrayList?

Accepted Answer

clear()

Answer

remove(element)

Answer

add(element)

Answer

isEmpty()

Question 14

In Java, what method is used to check if an ArrayList is empty?

Accepted Answer

isEmpty()

Answer

remove(element)

Answer

clear()

Answer

add(element)

Question 15

Which method in Java Math class is used to find the square root of a number?

Accepted Answer

sqrt()

Answer

power()

Answer

abs()

Answer

random()

Question 16

In Java, what method is used to set a new value at a specific index in an Array?

Accepted Answer

arrayName[index] = value

Answer

arrayName.add(value)

Answer

arrayName.remove(index)

Answer

arrayName.size()

Question 17

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

Accepted Answer

remove(index)

Answer

get(index)

Answer

set(index, element)

Answer

add(element)

Question 18

What is the purpose of the 'set()' method in Java ArrayList?

Accepted Answer

To replace an element at a specific index with a new element

Answer

To check if the ArrayList is empty

Answer

To remove all elements from the ArrayList

Answer

To add a new element to the end of the ArrayList

Question 19

In Java, which method is used to create a new instance of a class?

Accepted Answer

new

Answer

create

Answer

instantiate

Answer

initialize

Question 20

What does the 'get()' method in Java ArrayList return?

Accepted Answer

The element at the specified index

Answer

A random element from the ArrayList

Answer

The size of the ArrayList

Answer

The index of the specified element

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