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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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