Oracle Java SE 21 Practice Questions - Oracle Certified Professional Java SE 21 Developer (1Z0-830) Exam - Oracle Java SE 21 Practice Questions - Oracle Certified Professional Java SE 21 Developer (1Z0-830) Exam

Question 1

Which keyword is used to define a class in Java?

struct class define object

Correct Answer:

class

Question 2

What is the correct way to declare the main method in Java?

public void main(String[] args) public static void main(String[] args) static void main() public static int main(String[] args)

Correct Answer:

public static void main(String[] args)

Question 3

What is encapsulation in Java?

Inheriting properties from a parent class Bundling data and methods that operate on that data within a single unit (class) and restricting direct access to the data Converting objects to strings Running multiple threads simultaneously

Correct Answer:

Bundling data and methods that operate on that data within a single unit (class) and restricting direct access to the data

Question 4

Which access modifier makes a member accessible only within the same class?

public protected private default

Correct Answer:

private

Question 5

What is a record in Java 21?

A type of logging mechanism A compact, immutable data carrier class that auto-generates constructor, accessors, equals(), hashCode(), and toString() A database table reference A type of annotation

Correct Answer:

A compact, immutable data carrier class that auto-generates constructor, accessors, equals(), hashCode(), and toString()

Question 1

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About this Exam

Prepare with the Oracle Java SE 21 Practice Questions - Oracle Certified Professional Java SE 21 Developer (1Z0-830) Exam practice quiz. This question bank includes 100 questions covering java, difference, class, stream, and method. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Oracle Java SE 21 Practice Questions - Oracle Certified Professional Java SE 21 Developer (1Z0-830) Exam

This practice set contains 100 questions from the matching question bank and focuses on java, difference, class, stream, and method. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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Oracle Java SE 21 Practice Questions - Oracle Certified Professional Java SE 21 Developer (1Z0-830) Exam

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