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Java List Interface

Here are 10 essential multiple-choice questions on Java List Interface, covering key concepts.

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Question 1

Which of the following classes does NOT implement the List interface?

ArrayList
LinkedList
HashSet
Vector

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Question 2

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

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Question 3

What will be the output of the following code?

Java

import java.util.*; public class Test {     public static void main(String[] args) {         List<Integer> list = new ArrayList<>();         list.add(1); list.add(2); list.add(3);         list.add(1, 10);         System.out.println(list);     } }

[1, 2, 3, 10]
[1, 10, 2, 3]
Compilation Error
Runtime Error

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Question 4

Which List implementation provides the best performance for random access operations?

LinkedList
ArrayList
Vector
Stack

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Question 5

Which of the following statements is true about LinkedList?

It uses an array internally for storage
It allows fast random access using indexing
It has efficient insertions and deletions at both ends
It does not support null values

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Question 6

What will be the output of the following code?

Java

import java.util.*; public class Test {     public static void main(String[] args) {         List<Integer> list = new LinkedList<>();         list.add(10);         list.add(20);         list.remove(0);         System.out.println(list);     } }

[10]
[20]
Compilation Error
Runtime Error

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Question 7

What is the time complexity of ArrayList.add(index, element) operation in the worst case?

O(1)
O(log n)
O(n)
O(n log n)

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Question 8

Which of the following List implementations is synchronized?

ArrayList
Vector
LinkedList
CopyOnWriteArrayList

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Question 9

Which method is used to obtain a sublist from an existing List?

list.getSubset(start, end)
list.extract(start, end)
list.subList(start, end)
list.split(start, end)

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Question 10

What will be the output of the following code?

Java

import java.util.*; public class Test {     public static void main(String[] args) {         List<String> list = Arrays.asList("A", "B", "C");         list.add("D");         System.out.println(list);     } }

[A, B, C, D]
[A, B, C]
Compilation Error
Runtime Error

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