The functional Predicate interface gets used extensively by the Java 8 Streams API. Any developer who wants to master functional programming in Java will need to be comfortable with the Predicate ...

In Part 2 we’ll revisit those techniques using Java code that pre-dates Java 8. As you’ll see, this code is functional, but it’s not easy to write or read.

The Java language and virtual machine are almost two decades old, and while most developers would recognize the old and new models of Java as being related, there's no question that Java has changed ...

Lambda expressions are lightweight, highly concise anonymous methods backed by functional interfaces in Java 8. You can use them to leap forward into a whole new world of programming in Java. With ...

Clojure is a dynamic functional language for the JVM, recently released in version 1.0. Clojure offers a new set of programming techniques for robust code and rapid development. In particular, it ...

That three percent included packages, methods, and class names. But those declarations—like starting a function with package java.lang —can only be used in certain ways.