Java 21 Certification Guide

Overview

This repository contains study materials, code examples, and practice exercises for preparing for the Java 21 Certification exam, 1ZO-830. It is designed to help developers understand the core concepts of Java 21 and improve their proficiency in modern Java programming.

Java 21 Key Topics

• Java Language Enhancements
  • Sealed Classes
  • Pattern Matching
  • Record Patterns
  • Virtual Threads (Project Loom)
  • Scoped Values
• Functional Programming
  • Lambda Expressions
  • Streams API
  • Functional Interfaces
• Concurrency and Multithreading
  • Virtual Threads
  • Structured Concurrency
  • Executor Framework
• IO operations
• Collection API
• New APIs and Enhancements
• Working with Modules (JPMS)

Getting Started

Prerequisites

• Install Java 21 (JDK 21) from Oracle or OpenJDK.
• Install a Java IDE such as IntelliJ IDEA, Eclipse, or VS Code.
• Basic knowledge of Java is recommended.

Certification Tips

• Understand the exam objectives: Review the official Java 21 certification syllabus.
• Practice coding: Implement Java 21 features in small projects.
• Solve mock tests: Familiarize yourself with the exam format.
• Read Java documentation: Always refer to the latest Java API docs.
• Join Java communities: Participate in discussions and seek help from peers.

Study material

• Book: OCP Oracle Certified Professional Java SE 21 Developer Study Guide: Exam 1Z0-830 from Jeanne Boyarsky, Scott Selikoff
• Mock tests from Enthuware: https://enthuware.com/
• Main file from this project: Guide.md

Extra info

• Time limit: 120 minutes
• Number of questions 50%
• Passing score 68% (34 questions)
• There is only the option of doing it online
• It is harder than the last editions, the questions are bigger and harder

Useful links

• Forum: https://coderanch.com/c/certification
• Wiley test mocks: https://login.education.wiley.com/
• Author's blog: https://www.selikoff.net/ocp21/
• Java 21 - 6 full tests: https://www.udemy.com/course/ocp-oracle-certified-professional-java-developer-prep/learn/quiz/5686332#overview

Other's GitHub repository

• GitHub with some information: https://github.com/r331/OCP-Oracle-Certified-Professional-Java-SE-21-1Z0-839-Open-Study-Guide/blob/main/src/main/asciidoc/1Z0-829StudyGuide.adoc
• GitHub with many exercises: https://github.com/rndtavares/java21-cert

Contributing

Contributions are welcome! Feel free to submit issues or pull requests to improve the study materials.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Contact

For questions or discussions, reach out via:

• GitHub Issues

Happy Learning & Best of Luck with Java 21 Certification! 🚀