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Java 8 Objective Questions and Answers

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.
Medium
What is the main benefit of parallel streams?
17.
Medium
Which method converts a Stream back to a List?
18.
Medium
What does the peek() method do in a stream?
19.
Medium
Which interface is the base for all lambda expressions?
20.
Medium
What will be the output? Optional<String> opt = Optional.ofNullable(null); System.out.println(opt.orElse("Java"));
21.
Medium
Which Java 8 feature enables behavior parameterization?
22.
Medium
Which Collector is used to group elements in a stream?
23.
High
What does CompletableFuture improve over Future?
24.
Medium
Which method was added to String in Java 11?
25.
Medium
Which statement about streams is correct?
26.
Medium
Which functional interface returns a boolean result?
27.
Medium
What is the default behavior of Comparator.comparing()?
28.
Medium
Which Java feature allows interfaces to have method implementations?
29.
High
What will happen if two interfaces provide the same default method?
30.
Medium
Which method creates an infinite stream?
Answered: 0 / 15

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