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Java 8 Objective Questions and Answers

Test your skills with Java 8 and beyond multiple-choice questions. Covers lambdas, streams, functional interfaces, Optional, Date-Time API, concurrency, JVM enhancements, and modern Java features with explanations.

This Java 8 quiz is designed to test your skills with modern Java features. It focuses on practical understanding, output-based questions, and advanced concepts commonly asked in interviews and real-world development.

Practice Java 8 MCQs with Detailed Explanations

Answer at least 12 questions to submit.

1

Which statement best describes a functional interface in Java 8?

Medium
2

What will be the output of the following code? List<Integer> list = Arrays.asList(1, 2, 3); list.stream().map(x -> x * 2).forEach(System.out::print);

Medium
3

Which Stream operation is considered terminal?

Medium
4

What is the main purpose of Optional in Java?

Medium
5

Which default method is added to the Iterable interface in Java 8?

Medium
6

What will be the output? Stream.of("a", "bb", "ccc") .filter(s -> s.length() > 1) .count();

Medium
7

Which functional interface represents a function that takes an argument and returns no result?

Medium
8

Which method is used to create a Stream from a collection?

Easy
9

Which Date-Time class in Java 8 is immutable and thread-safe?

Medium
10

What happens if a stream has no terminal operation?

Medium
11

Which method was added to Map in Java 8?

Medium
12

What is the purpose of the @FunctionalInterface annotation?

Medium
13

Which method short-circuits a stream?

Medium
14

What is the return type of Stream.reduce() without an identity value?

Medium
15

Which Java version introduced the module system?

Medium
Answered: 0 / 15

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