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Stay up-to-date with the latest tips and tutorials about Java programming, algorithms and data structures.

The Best History Books (updated 2021)

by Sven Woltmann – October 18, 2021

Do you need a change from technical books? Something you can read before going to bed without your head spinning all night?

Then this is the right place for you!

Red-Black Tree (Fully Explained, With Java Code)

by Sven Woltmann – September 29, 2021

What is a red-black tree? How do you insert, search and delete nodes? By which rules is the tree balanced? How to implement a red-black tree in Java? And how do you determine its time complexity?

How to switch Java versions in Windows - feature image

How to change Java versions in Windows (updated 2021 for Java 17)

by Sven Woltmann – September 14, 2021

In this article, I'll show you how to install several Java versions simultaneously in Windows and how to switch between them on the command line with short commands.

AVL Tree (With Java Code)

by Sven Woltmann – August 31, 2021

What is an AVL tree? How do you calculate a node's balance factor? How does rotation work and how is an AVL tree balanced? How to implement an AVL tree in Java?

Binary Search Tree (With Java Code)

by Sven Woltmann – June 17, 2021

What is a binary search tree (BST)? How do you insert new elements, how do you search for them, and how do you delete them? How do you implement a BST in Java? And how does it differ from similar data structures?

Best books for programmers - feature image

The best books for programmers (updated 2021)

by Sven Woltmann – June 8, 2021

In this article, I have compiled a list of the best books for programmers.

The books cover programming in general (hard skills and soft skills) and Java programming in particular.

Show more articles...

Working with Sven really leveled up my Java and development skills! He provided invaluable guidance in all aspects of development, including concurrency, performance, reliability, and DevOps. Sven's focus on clean architecture meant our applications were simple to maintain and extend. He's always on the cutting edge of Java developments and is a pleasure to work with.

Matt Schultz

Software Engineer at HappyCo

On a professional level, Sven and I are connected by more than 20 years, several company foundations, and the implementation of some very innovative ideas in the internet sector. Sven not only had the hat of the CTO but also of the software architect and lead developer. Also, the management of larger teams has been part of his tasks.

If you want to summarize Sven's performance and get to the point, I can only think of a quote from a very well-known business angel who once said: "Sven's software is not software. It is a piece of art".

Fabien Röhlinger

Managing Director at NextPIT GmbH

I have worked with Sven for over seven years, and I have to say that he stands out among the Java developers that are around today. Sven's superb attention to detail and vast technical knowledge always provided top-quality, thoughtful, and professional outcomes in any work.

With Sven's excellent mentoring and guidance ability, I gained high impact skills in solving complex problems and reached a new level as a developer. I highly recommend him to anyone who is looking for an efficient, talented, and skilled programmer!

Daniil Tomilow

Senior Software Engineer Frontend at RatePAY

I had the pleasure of working with Sven for more than a year. Working with Sven means each day you learn a little more. A manager whose ability to handle multiple projects was unlikely any I had seen before and made a dramatic increase in the productivity level of our company.

Whenever I have questions or concerns, Sven responds right away and even follows up later in the week or month to make sure my issues have been resolved. His patience and willingness to help me motivated me to do the best job I can.

"Genuine expertise" is the phrase that comes to my mind when I think about Sven.