Java ArrayList

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Question 1

What is the default initial capacity of an ArrayList when it is created using the no-arg constructor?

A
5
B
10
C
20
D
1

Question 2

What will be the output of the following code?

Java

import java.util.*;
public class Test {
    public static void main(String[] args) {
        ArrayList<Integer> list = new ArrayList<>();
        list.add(1);
        list.add(2);
        list.add(3);
        list.remove(1);
        System.out.println(list);
    }
}

A
[1, 3]
B
[2, 3]
C
[1, 2]
D
[1, 2, 3]

Question 3

Which method of ArrayList is used to add an element at a specific index?

A
addAtIndex()
B
insert()
C
add()
D
add(index, element)

Question 4

What will be the result of the following code?

Java

import java.util.*;
public class Test {
    public static void main(String[] args) {
        ArrayList<Integer> list = new ArrayList<>();
        list.add(10);
        list.add(20);
        list.add(30);
        list.add(40);
        list.set(2, 50);
        System.out.println(list);
    }
}

A
[10, 20, 50, 40]
B
[10, 20, 30, 40]
C
[10, 20, 40, 50]
D
[50, 20, 30, 40]

Question 5

Which of the following methods is used to check if an ArrayList is empty?

A
isEmptyList()
B
isNull()
C
isEmpty()
D
empty()

Question 6

Which of the following methods returns the number of elements in an ArrayList?

A
size()
B
length()
C
count()
D
getSize()

Question 7

What is the time complexity of the add() method in an ArrayList (amortized case)?

A
O(1)
B
O(n)
C
O(log n)
D
O(n^2)

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