java

Java Jumpstart: Essentials

Master Java's core: from the JVM and encapsulation to deep object-orientation, Collections, and error handling.

Expected Outcome

The ability to build robust, object-oriented applications using secure class hierarchies, HashMaps, and Try-Catch.

Target Audience

For developers from other languages (for example C#, Python, JS) wanting to quickly code professional Java.

Prerequisites

Programming experience from another language is required, but no prior Java knowledge is necessary.

Curriculum & Highlights

→ Classes, Objects & Encapsulation

→ Polymorphism & Inheritance

→ Interfaces & Clean Code

→ Collections (List & HashMap)

→ Error Handling & Try-Catch

→ Flow Control & Enums

→ JVM & Memory Management

Challenges we address

"How do you encapsulate data and build secure classes that protect their own state?"

"How do you use polymorphism (inheritance and interfaces) to build dynamic architecture?"

"How do you store data efficiently with HashMap and handle crashes using Exceptions?"

Detailed Description

Learning a new language is often about quickly becoming productive, but without a guided walkthrough of Java's structure, it's easy to miss the conventions that make the language so powerful. In large Enterprise systems, this technical debt quickly leads to fragile applications, where debugging takes unnecessary time away from modern feature development. This workshop eliminates the learning curve through Active Learning, where participants code extensively throughout the day in two parallel domains (a restaurant system and a hotel system). A complete and secure architecture is built from the ground up. Focus ranges from understanding the JVM and strict encapsulation, all the way to advanced object-orientation with polymorphism, efficient Collections, and structured error handling. Throughout the day, the module dives deep into how inheritance (extends) and interfaces (implements) are used to replace rigid if-statements with a dynamic and extensible architecture. Java's Collections Framework is applied to manage data in dynamic lists, and lightning-fast key lookups are built using HashMap. By integrating try-catch and building custom Exceptions, Clean Code patterns are established that can be taken directly into production. Actlea's core philosophy is that a solid understanding of object-oriented patterns is the foundation for all successful software development. Experience shows that the ability to structure logic into well-defined classes is what defines a professional developer in 2026. Mastering these fundamental patterns is the single most important prerequisite for the team to later take advantage of modern architectural choices in Java 21 and 25.

Recommendation & Next Steps

Once these object-oriented foundations are solid, the next natural step is to level up with 'Modern Java Fast-Track'. →

Format Workshop

Duration 1 day

Level Foundational

Instructor Andreas Olsson

Price per group $2,900

Standard price per group (up to 12 participants) for remote delivery. Additional costs apply for onsite delivery.

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Download Overview (PDF)

Tech Stack

Java OOP Polymorphism Collections Exceptions Foundations

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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Java • Spring Boot • Spring AI

Enterprise teams trained by Actlea

Participant Reviews

What past participants say

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

"I recently had the pleasure of being a student of Andreas and I cannot speak highly enough of his skill and professionalism. Throughout the training, Andreas demonstrated a deep understanding of Java programming and was able to convey complex concepts in a way that was easy to understand. His ability to break down difficult topics and explain them in a clear and concise manner was truly remarkable. Overall, I would highly recommend Andreas as a teacher of Java programming. His skill and professionalism make him an exceptional educator, and I am grateful to have had the opportunity to learn from him. If you are looking for a teacher who is knowledgeable, patient and passionate about teaching, Andreas is the perfect choice."

"Andreas is the name of competence, skill and reliability. He is no doubt a guru in the field of Java. His style of teaching is practical, well structured and effortless; I learned Java by doing it because of his well organized assignments.I felt connected, confident and comfortable with Andreas during the whole course because he listens, replies and helps each and every student in a very productive and professional way"

"I thought it would be almost impossible to learn everything that was going to be covered in the three months we had. But Andreas broke it all down and explained in such a way that you understood and adjusted the pace of the training while making sure that all subjects were covered. It is obvious that he has a lot of knowledge and enjoys teaching."

"As one of Andreas's former Java students who landed a job in the field after graduation, I can attest to the fact that he's an inspiring and knowledgeable teacher. Andreas is an expert in his field, always joyful and optimistic, and great at feedback. With his fast-paced teaching style, he will keep you on your toes and ensure that you're always engaged in the learning process (Believe me!! 😉). Not only is Andreas a fast speed educator, but he's also eager to adapt his way of educating so that it's universal to all students. He understands that everyone learns differently and is always looking for ways to make the material accessible to all learners 👍. Andreas is also committed to making sure that you get to know a little bit of everything in the world of Java. His comprehensive approach ensures that you'll gain a broad understanding of the subject, from the basics to more advanced concepts."

"It has been a great experience to have Andreas as my Java teacher. He has shown an extraordinary teaching ability by explaining the concepts in a simple and clear way that made it easy for me to understand. His patience and consideration have helped me overcome difficulties in the learning process and feel comfortable asking questions. He is always motivating and encourages me to strive to reach my full potential. I am grateful for his dedication to my education and highly recommend him to other students who want to learn Java."

"Andreas is a very positive and easy-going individual, but above all a fantastic educator. His teaching method and structure is adapted for everyone from beginners to experienced participants. Quick to provide personal assistance, called up on video chat and took his time. I appreciated all the Java days, I am so satisfied and grateful with the foundation I got with me. Strongly recommend. Rating 5 out of 5 stars! ⭐️⭐️⭐️⭐️⭐️"

"Andreas is a knowledgeable and pragmatic teacher who with a good mood shares knowledge that feels relevant to working life with a high level of competence."

"During my Java training, I have had the privilege of having Andreas as a teacher. Throughout the training, Andreas has been very pedagogical and makes sure that every student follows along in the training, regardless of what previous experience they have. Thanks to his broad competence in Java, the training has been very educational and engaging."

"My name is Rabia and I participated in the Java Developer course with Andreas starting January 2022 after 20 years in the banking and finance industry. Previously had no experience whatsoever in the IT world, but chose the track with the digitization the world is going through. The course was incredibly broad & intensive and gave a good overview. When the course was over, I was hired by Capgemini as a junior developer. During the course I probably complained many times about how much information it presented, but I have benefited greatly from everything I have been taught. I continue to learn every day but have an understanding that still amazes me when I realize how much I brought with me. Thanks Andreas for everything! The course has given me the opportunity to pursue a new career in a new industry that I love. The change has given me new energy and opened up new doors. I am so grateful!"

"Andreas is an excellent teacher who shows great competence in system development with Java and has developed an effective and engaging curriculum. He is an experienced system developer with broad knowledge of the Java ecosystem and he provides valuable feedback that helps students grow and develop as programmers. Andreas also encourages independent and creative thinking for students. I highly recommend Andreas to anyone looking for a high-quality education in Java development."

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