java

Java Foundations: Fast-track

Intensive Java onboarding for experienced developers. Master object-oriented concepts, Data-Oriented Programming (Java 21+), and functional data streams.

Expected Outcome

Full control over Java fundamentals, type-safe domain modeling with Records/Sealed Interfaces, massive scaling with Virtual Threads, and declarative data handling via Streams.

Target Audience

Developers from other backgrounds needing a fast but architecturally stable start in modern Java development in 2026.

Prerequisites

Programming experience in another language is required, or previous knowledge of Java that needs a solid update to modern standards.

Curriculum & Highlights

Core Java & Deep OOP
Data-Oriented Programming
Virtual Threads (Project Loom)
Records & Sealed Interfaces
Pattern Matching (Exhaustive Switch)
Streams API & Collectors
Type Safety with Optional

Challenges we address

"How do we build robust object-oriented code and handle references and errors correctly in Java?"

"How do we leverage Records, Sealed Interfaces, and Pattern Matching for type-safe business logic?"

"How do we process data declaratively using Streams, Collectors, and Virtual Threads?"

Detailed Description
Mastering Java as an experienced developer is about quickly understanding the platform's foundations and modern paradigms. This three-day course is an intensive onboarding that takes you from Java's fundamental building blocks to advanced object-oriented programming, modern data handling, and functional programming. Through Active Learning, we establish a professional standard for building robust and maintainable systems in complex environments. The journey begins with object lifecycles, flow control, and deep object-oriented principles. We then shift our focus to the cutting edge of Java 21+, exploring how modern syntax minimizes boilerplate and how Project Loom enables massive scalability. Finally, we demystify the declarative paradigm, demonstrating how complex logic can be transformed into elegant, crash-safe data streams. The goal is to provide you with immediate delivery capabilities in modern Enterprise projects. We dive deep into architecture by applying Data-Oriented Programming (DOP). By combining Records, Sealed Interfaces, and Exhaustive Pattern Matching, we create extremely type-safe domain models where the compiler actively warns against logical oversights. To build pipelines without mutable state, we leverage Lambdas, Method References, and the Streams API, securing our return values against NullPointerExceptions using Optional. We also explore the future of performance through Virtual Threads for massive-scale asynchronous execution. Actlea's core philosophy is that syntax is merely the tool; understanding the underlying patterns is what defines a senior developer. Experience demonstrates that a broad yet deep understanding of Java's modern foundations is the single most important factor in maintaining development velocity over time. This training serves as the critical bridge that transforms existing expertise in other languages into full-scale mastery of the Java platform.
Recommendation & Next Steps

With Java's foundations and modern syntax in place, the next logical step is building cloud-ready web services in 'Spring Boot Jumpstart: Essentials'.

Format Expert Course
Duration 3 days
Level Professional
Instructor Andreas Olsson
Price per group On Request

Pricing is based on scope and number of participants. Both remote and onsite delivery is available.

Tech Stack
Java 21 Java 25 Functional Java Project Loom Architecture OOP
Andreas Olsson

Your Instructor

Andreas Olsson

Expertise through Active Learning

Java and the Spring Framework have been my core focus for over 20 years. Today, my mission is primarily to help organizations step into the future by integrating intelligent agents and AI-driven features into modern Java systems.

Actlea stands for Active Learning – the philosophy that programming is best learned by writing code, not by watching slides. My workshops focus on intensive, hands-on exercises designed to solve real-world problems.

I deliver proven training concepts globally across all timezones. While I specialize in remote delivery, I love to travel for onsite workshops. My modules are ready for immediate impact but can be tailored to your team's specific requirements.

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Enterprise teams trained by Actlea

Academic Work
Handelsbanken
Scania
Swedbank
CGI
SEB
Participant Reviews

What past participants say

Read about the pedagogical approach, the hands-on labs, and the impact on daily work.

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Take the next step

Ready to elevate your
team's expertise?

Book a single workshop, combine modules into a package, or plan a full-scale bootcamp. My training is built on proven standard modules, ready to be delivered immediately to your team, regardless of your location.

  • Expert standard modules for senior teams
  • Global delivery across all time zones
  • Fixed group rate for up to 12 participants (remote)
  • Flexible delivery: Remote or On-site

Get in touch for a quote or to discuss availability.