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This quiz tests your understanding of core Java concepts essential for Oracle Java certification. It covers object-oriented principles, exception handling, collections, streams, and multithreading\u2014key topics for professional...

Questions: 15 | Attempts: 10 | Last updated: Jul 15, 2026

Sample Question 1
Which keyword is used to prevent a class from being subclassed in Java?

Private

Final

Static

Abstract

Sample Question 2
What is the default value of an instance variable of type int in Java?

0

Null

Undefined

-1

Sample Question 3
Which interface must be implemented to create a custom comparator for sorting objects?

Iterable

Comparable

Comparator

Serializable

Oracle Java Quizzes, Questions & Answers

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