Predefined functional interfaces. Java 8 introduced predefined functional interfaces (java.util.function) so that developers don’t have create our own functional interfaces for common tasks.

With a basic understanding of these functional interfaces, you can easily master the other 35 or so functions because the remainder simply build on these five concepts. Just look at the various ...

So to learn Java lambda syntax, you need to be familiar with its three component parts: The argument list; The arrow; The method body; To apply these concepts, we first need a functional interface. A ...