In this post we’ll show a practical example of processing tree-like structure using streams and Java 8 flatMap.
There are many ways to create Java Streams and for each of them we’ll show examples. This flexibility is needed especially when combined with flatMap!
To calculate MD5 hash in Java we can use pure Java approach or use libraries. In this post we’re going to show how to calculate Message Digest in different ways.
Java 8 Comparators with Method References in action. We mix Java 8 static and default methods with method references to sort objects by multiple fields using chained Comparators!
Regular Expressions are very handy for text processing. In this article we’ll show Java Regex to remove duplicated words, which is a common task.
A pretty cool exercise in writing Java Regular Expressions is to write Java regex matching IP Address. In this post we’ll show IP regexp and use in IP Address validator.
In Java 8 interfaces default and static methods are major changes that allow to extend existing code without breaking anything. It should be the first step into Java 8.
javax.validation defines a number of Bean Validation Constraints for values of most commonly used types. In this post we’ll show how to use each of them!
In this article we present practical Bean Validation Unit Testing using JUnit. Testing this part is very simple, yet often neglected by many developers. Let’s fix that!