Java 21 has recently entered “rampdown phase one”, and is planned for general availability in September! This new LTS release comes with many new features, that’s why I want to take the next few weeks to take a deeper look at the ones that excite me the most!

I’m happy to announce that my book, “A Functional Approach to Java: Augmenting Object-Oriented Java Code with Functional Principles” is finally available 🥳

Besides lambdas expressions, Java 8 introduced another language syntax change in the form of a new operator, :: (double colon), to create so-called method references.

Even though interfaces and abstract classes have many similarities at first look, especially after introducing default methods, they have different use cases and capabilities.

The concept of traversing elements with Iterators is supported since Java 1.2, but got a new relative in Java 8: java.util.Spliterator

Iterating data structures is one of the most common tasks. Everyone knows the classics, like for or while. But there are more ways to iterate in Java, providing a lot more functionality.