HappyCoders logo

Become a Better Programmer!

Sven Woltmann
Receive regular tips about Java programming, algorithms and data structures!
Newsletter Form (en)
Unsubscribe whenever you want. Read my Privacy Policy.
advent of code 2025 solutions
HappyCoders Glasses

Advent of Code 2025 – Java Solutions

Sven WoltmannSven WoltmannDecember 5, 2025
Explore Advent of Code 2025 with clear Java 25 solutions focused on readability, SonarQube quality, and practical coding insights.
Read more »
java 26 feature image
HappyCoders Glasses

Java 26 Features
(with Examples)

Sven WoltmannSven WoltmannDecember 3, 2025
The new Java 26 features: Prepare to make final mean final, Ahead-of-Time Caching with all GCs, HTTP/3, G1 with better throughput, and more...
Read more »
java withers - derived record creation
HappyCoders Glasses

Withers in Java: “Derived Record Creation Expressions”

Sven WoltmannSven WoltmannSeptember 3, 2025
Learn how Withers and Derived Record Creation Expressions simplify Java records, avoid boilerplate, and make working with immutable data structures easier.
Read more »
Development team on a modern, futuristic sailboat at sunrise, looking ahead together, symbolizing the start of Java modernization.
HappyCoders Glasses

Java Modernization: How to get your Team and Management on Board

Sven WoltmannSven WoltmannAugust 11, 2025
How to get your team management excited about Java modernization – with clear arguments, practical examples quick wins for sustainable success.
Read more »
java 25 feature image
HappyCoders Glasses

Java 25 Features
(with Examples)

Sven WoltmannSven WoltmannJune 5, 2025
Java 25: Scoped Values, Module Import Declarations, Compact Source Files, Instant Main Methods, Flexible Constructor Bodies, Compact Object Headers and more...
Read more »
Initialization-on-Demand Holder in Java - Feature Image
HappyCoders Glasses

Initialization-on-Demand Holder Idiom in Java

Sven WoltmannSven WoltmannMay 8, 2025
Learn how the Initialization-on-Demand Holder Idiom in Java enables secure and efficient lazy initialization without performance penalties.
Read more »
double checked locking in java - feature image
HappyCoders Glasses

Double-Checked Locking in Java

Sven WoltmannSven WoltmannMay 8, 2025
Discover the Double-Checked Locking pattern in Java: Optimize thread-safe, lazy object initialization without performance losses.
Read more »
Java Stable Values JEP 502 Feature Image
HappyCoders Glasses

Lazy Constants in Java
(formerly Stable Values)
– Safe and Lazy Initialization

Sven WoltmannSven WoltmannApril 9, 2025
What are Lazy Constants and how do you use them? What are Lazy Lists and Lazy Maps? How do Lazy Constants work internally?
Read more »
Compact Object Headers Feature Image
HappyCoders Glasses

Java Compact Object Headers
(JEP 519)

Sven WoltmannSven WoltmannApril 7, 2025
Compact Object Headers compress Java object headers from 96 bits (12 bytes) to 64 bits (8 bytes). How does this work without loss of information?
Read more »
Java 24 Features Hero Image
HappyCoders Glasses

Java 24 Features
(with Examples)

Sven WoltmannSven WoltmannDecember 4, 2024
All Java 24 features with examples: Stream Gatherers, Synchronize Virtual Threads without Pinning, Ahead-of-Time Class Loading & Linking, Compact Object Headers - and more!
Read more »
1 2 3 … 13