Explore different ways to determine whether a String is numeric or not.

Learn how to sort HashMap entries by their key or value

A quick and practical introduction to varargs in Java.

A quick and practical overview of OOP concepts in Java.

When using regular expressions in Java, sometimes we need to match regex patterns in their literal form – without processing any metacharacters. Let's find out how we can do that.

a.k.a. “How do I subclass a list element declared in my interface?” As covered by the rather awesome Ram on Baeldung, the Liskov substitution principle is

A quick example and explanation of the replace() API of the standard String class in Java.

Interested to learn about MicroProfile OpenAPI? Check our article explaining how the SmallRye Implementation extends with some extra features.

A quick and practical guide for using Pattern Matching features in Vavr

A short article focused on the common problem of testing if two List instances contain the same elements in exactly the same order.

Learn how to convert a Java Date to an OffsetDateTime.

Here's how to create copy constructors in Java and why to implementing Cloneable isn't such a great idea.

Learn why local variables are thread-safe in Java.

Interested to learn about OpenAPI? Check our article explaining how OpenAPI makes documenting these RESTful services very easy.

A quick Java solution for a simple math problem of finding the distance between two points