What you'll learn:
- Master modern Java (8–25): incl. lambdas, streams collections, concurrency, modules, records, pattern matching, virtual threads, scoped values, stream gatherers
- Build and test a Spring Boot 3 REST API (Dependency Injection/Inversion of Control, architecture, Postman testing).
- Prepare effectively for Oracle OCP exams with full practice tests, quizzes, and detailed explanations.
- Get hands-on with assignments and access to my GitHub code so you can practise, modify, and learn by doing.
This course has been selected by Udemy for inclusion in Udemy Business — Udemy’s curated collection of high-quality courses used by organisations worldwide.
“Udemy Business is a curated (carefully chosen) selection of high-quality Udemy courses — like yours.” — Udemy
“Only 3% of all courses are chosen for Udemy Business.” — Udemy
The course is fully updated to Java 25 and covers Java 8, 11, 17, 21, and 25 — showing how modern Java evolved across these releases.
Since being selected for Udemy Business, the course has been significantly expanded and updated, including:
• Spring Boot 3
• Java 21 and Java 25 content
• 2 Full OCP Certification Practice Tests
• 5 Additional OCP Practice Quizzes
• All code now available on my GitHub repositories
Who this course is for (important)
This is an advanced Java course.
It is designed for:
Developers who already know Java fundamentals
Learners who want to properly understand modern Java (8 → 25)
Those preparing for Oracle OCP certifications
Professionals who want deep understanding
Note:Java fundamentals are not covered (classes, interfaces, operators, basic syntax).
The course starts immediately with Java 8 lambdas and streams.
What makes this course different
Many Java courses:
Stop at Java 8 or Java 11
Treat newer versions as bolt-ons
Focus on syntax rather than reasoning
You will:
Learn how Java evolved from Java 8 through Java 11, 17, 21, and 25
Understand why language features exist, not just how to use them
Work through assignments that evolve across Java versions
Learn with both real-world development and certification in mind
Topics are explained using:
Clear theory
Extensive, annotated code examples
Assignments that reinforce understanding
Video explanations for all practice questions
What students say
(A small selection — more reviews are available below)
“Great course, great explanation. The best course in Java I have seen so far.” — Kaylan AD
“I am nearing retirement. I have learned more about lambdas here than in the rest of my career.” — Robert R
“This course is a jewel… I passed the OCA and hope to pass the OCP now.” — Yigit K.
“Definitely the best Java course I’ve ever taken… especially the Java 21 features.” — Anna
“Excellent detail, perfect pace, and outstanding explanations.” — Ricardo Q.
"So far its the best course for java professional who want to start from new features of java 8" — Ankit M.
Course overview
Java currently has five Long-Term Support (LTS) releases:
Java 8, 11, 17, 21, and 25 — and this course covers all of them.
This course is the successor to my other Udemy Business course:
“Java 8 OCA (1Z0-808) Certification – Master the Fundamentals”.
As a result:
Java fundamentals are assumed
The course begins with advanced Java 8 topics
Each later Java version builds on the previous one
Java 8 – Advanced Topics
Lambda Expressions
Streams
Generics
Collections
Concurrency
JDBC
File I/O and NIO.2
Serialisation
Localisation
Assignments are included for lambdas, streams, and collections.
Java 11
Modules (examined in detail with examples)
Local Variable Type Inference (LVTI)
Private interface methods
Annotations
Security
Java 17
Sealed classes
Records
Switch expressions and pattern matching
Text blocks
A significant assignment covering all Java 17 topics is included.
Java 21
Unnamed classes and instance main methods (preview features)
Record patterns
Pattern matching for switch
Sequenced collections
Virtual Threads
An assignment building on the Java 17 assignment is included.
Java 25
Markdown documentation
Unnamed variables and unnamed patterns
Module import declarations
Compact source files and instance main methods (finalised)
Flexible constructor bodies
Scoped values
Stream gatherers
An assignment building on the Java 21 assignment — and incorporating all Java 25 features — is included.
Spring Boot 3 Application (updated to Java 25)
Configuring a Spring Boot application and dependencies
Understanding how RESTful applications work
Dependency Injection / Inversion of Control
Architecture overview
Code explained in detail
Testing with Postman
An assignment is used to reinforce the material, and its solution is explained in detail.
OCP Certification Preparation
2 Full OCP Practice Tests
50 questions each
120-minute time limit
68% pass mark (as per Oracle exams)
Every question has a detailed video explanation
Even if you do not plan to take the certification, the solution videos provide excellent learning opportunities.
5 OCP Practice Quizzes
69 MCQ questions in total
Every question explained with a video solution
This course supports preparation for:
Java 8 OCP (1Z0-809)
Java 11 OCP (1Z0-819)
Java 17 OCP (1Z0-829)
It also works very well alongside the Enthuware OCP Certification tool.
About the instructor
I am a PhD-qualified University lecturer and have been teaching since 2002.
For over 13 years, I have taught advanced Java on a bespoke Masters programme on behalf of a highly regarded software company.
I have co-authored two books:
Learn Java with Projects
Java Memory Management
I love teaching, and this course brings together:
My academic background
My industry experience
My passion for clear, structured explanations
A strong attention to detail, particularly suited to Oracle Java certifications
Final note
This course is designed to give you:
A deep understanding of modern Java
Confidence in real-world development
Strong preparation for Oracle OCP exams
If you already know Java fundamentals and want to truly master Java 8 through Java 25, this course is for you.
More student feedback
“Extraordinary Explanation.” — Darshan P.
“The course is amazing, learned a lot of good things.” — Rakesh L.
“This course provides an exceptional hands-on learning experience… invaluable resource for Java developers.” — Naveen KG
“Sean is technically superior in Java; he’s the best I know.” — Axel B.
“This course is a jewel… Sean answers questions… I passed the OCA… hope to pass the OCP now.” — Yigit K.
“Easy to follow and straight to the point.” — Daniel M.
“Great how detailed it is.” — Ali A.
“Excellent – especially like the detail and pace.” — Alan C.
“One of the best courses so far… perfect talking speed… content is excellent.” — Ricardo Q.
“Very useful exercises and really interesting syllabus.” — Laura
“Clearly explained, easy to follow and understand. Good code examples.” — Ugyen N.
