You will run into the Function interface in a variety of places, especially when you start advanced functional programming with the Java Streams API. Powerful methods such as map, reduce and flatMap ...

map(name -> { // keep only last names ... Say you needed to use that fancy string sorter in several places. In Java, we could create a functional interface to share that operation: static class ...

Java 8 introduced Java developers to functional programming with lambda expressions. This Java release effectively notified developers that it’s no longer sufficient to think about Java ...