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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.

16

What is the main benefit of parallel streams?

Medium
17

Which method converts a Stream back to a List?

Medium
18

What does the peek() method do in a stream?

Medium
19

Which interface is the base for all lambda expressions?

Medium
20

What will be the output? Optional<String> opt = Optional.ofNullable(null); System.out.println(opt.orElse("Java"));

Medium
21

Which Java 8 feature enables behavior parameterization?

Medium
22

Which Collector is used to group elements in a stream?

Medium
23

What does CompletableFuture improve over Future?

High
24

Which method was added to String in Java 11?

Medium
25

Which statement about streams is correct?

Medium
26

Which functional interface returns a boolean result?

Medium
27

What is the default behavior of Comparator.comparing()?

Medium
28

Which Java feature allows interfaces to have method implementations?

Medium
29

What will happen if two interfaces provide the same default method?

High
30

Which method creates an infinite stream?

Medium
Answered: 0 / 15

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