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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.

31.
Which Java version introduced var for local variables?
Medium
32.
What is the main purpose of Spliterator?
High
33.
Which stream operation is stateless?
High
34.
What does Optional.map() return?
Medium
35.
Which collector joins stream elements into a single String?
Medium
36.
What is the main advantage of the new Date-Time API?
Medium
37.
Which method executes an action if Optional has a value?
Medium
38.
Which stream operation may change encounter order?
High
39.
Which interface represents a supplier of results?
Medium
40.
What will be the output? IntStream.range(1, 5).sum();
Medium
41.
Which Java version made G1 the default garbage collector?
High
42.
Which stream operation removes duplicate elements?
Medium
43.
Which Java feature allows methods to be referenced without invocation?
Medium
44.
Which method converts an Optional to a Stream?
High
45.
Which Java release introduced records?
High
Answered: 0 / 15

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