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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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