Java 8 formalized this concept by requiring a functional interface to be annotated with the java.lang.FunctionalInterface annotation type, as in @FunctionalInterface.

Lambdas and the Function interface The goal of the Function interface is to take a value from the program, perform some type of calculation or operation on that value and then return a new value. Here ...

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 ...

Java’s collections like arrays and lists are foundational building blocks. Functional programming techniques are at times the ideal way to work with these collections. This article gives a tour ...