HappyCoders Developer Blog: Java, Algorithms, Data Structures

Java 23 Features
(With Examples)

Sven WoltmannJune 6, 2024

All Java 23 features with examples: primitive type patterns; Markdown in JavaDoc; importing modules; `print()`, `println()` and `readln()` without `System.in` and `System.out`; field initialization in the constructor before super() – and more!

Java main()
Method – With New Features 2024

Sven WoltmannMay 30, 2024

Discover everything about the main method in Java, the starting point of every Java program. Find out more about the components, invocations, and the latest simplifications in Java versions 21 to 23.

Best Neuroscience Books
(Updated 2024)

Sven WoltmannMay 27, 2024

The best books on neuroscience – the study of the nervous system. How does the brain work? What is sleep?

Array Length in Java

Sven WoltmannApril 14, 2024

How to find the length of an array in Java? How do you set the length? How much memory does an array occupy and what is the maximum size?

How to Initialize Arrays in Java

Sven WoltmannApril 9, 2024

How to declare and initialize arrays in Java? How to copy and fill them? How to convert lists, sets and streams into arrays?

Hexagonal Architecture with Spring Boot
[Tutorial]

Sven WoltmannDecember 27, 2023

In the fifth and final part of the series on hexagonal architecture, we migrate the Quarkus application to Spring Boot – once more without changing a single line of code in the core of the application.

Java 22 Features
(with Examples)

Sven WoltmannDecember 7, 2023

All the new Java 22 features with examples: Unnamed Variables & Patterns, Stream Gatherers, Foreign Function & Memory API, Launch Multi-File Source-Code Programs ... and more!