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 & OOP Principles
Data-Oriented Programming
Virtual Threads (Project Loom)
Records & Sealed Interfaces
Pattern Matching (Switch)
Streams API & Collectors
Modern Java Best Practices
Type Safety with Optional

Challenges we address

"How is robust object-oriented code built and how are references and errors handled correctly in Java?"

"How are Records, Sealed Interfaces, and Pattern Matching leveraged for type-safe business logic?"

"How is data processed 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 leads from Java's fundamental building blocks to advanced object-oriented programming, modern data handling, and functional programming. Through Active Learning, a professional standard is established for building robust and maintainable systems in complex environments. The journey begins with object lifecycles, flow control, and deep object-oriented principles. Focus is then shifted to the cutting edge of Java 21+, exploring how modern syntax minimizes boilerplate and how Project Loom enables massive scalability. Finally, the declarative paradigm is demystified, demonstrating how complex logic can be transformed into elegant, crash-safe data streams. The goal is to provide immediate delivery capabilities in modern Enterprise projects. Architecture is dived into deeply by applying Data-Oriented Programming (DOP). By combining Records, Sealed Interfaces, and Exhaustive Pattern Matching, extremely type-safe domain models are created where the compiler actively warns against logical oversights. To build pipelines without mutable state, Lambdas, Method References, and the Streams API are leveraged, securing return values against NullPointerExceptions using Optional. The future of performance is also explored 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.

Connect on LinkedIn

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.

Related Training

java Professional

Modern Java Fast-Track

1 day
Group Rate: $2,900

Upgrade the codebase by mastering Data-Oriented Programming, Java 21, and Virtual Threads.

  • Records & Text Blocks
  • Data-Oriented Programming (DOP)
  • Sealed Interfaces & Type Safety
java Professional

TDD & JUnit: Quality in Java

1 day
Group Rate: $2,900

Secure code quality by mastering TDD and JUnit 5 for modern Java applications.

  • JUnit 5 Core & Assertions
  • TDD: Red-Green-Refactor
  • Structuring Test Classes
spring boot Professional

Spring Boot: Spring MVC & Thymeleaf

1 day
Group Rate: $2,900

Rapid Web Development: Build fast SSR web apps with Spring MVC and Thymeleaf. Master forms and sessions through hands-on Active Learning.

  • Spring MVC & SSR Architecture
  • Thymeleaf Syntax & Attributes
  • Form Binding & Submissions
Take the next step

Ready to elevate your
Team's expertise?

Book a single workshop, a multi-day course, or a complete training package. The programs are built on proven standard modules of high technical quality, designed to be deployed immediately without lengthy preparation.

  • Expert-led training: Designed for professional development teams.
  • Standardized quality: Proven modules ready for immediate delivery.
  • Flexible formats: Execution is handled remote or onsite.

Send an inquiry to discuss availability and setup, completely without sales pressure.

Prefer connecting directly on LinkedIn? Skip the form:

Connect & Message on LinkedIn →