Interested in Java functional programming? The first place you need to start, especially if you use the Streams API, is with this Java Function interface example.

Here’s an example of how a Function and lambda expression work together: Function<Integer, String> verboseLambda = (Integer x)-> { return Integer. toString (x*x); }; System.

In the above example, we already briefly explored a simpler way to use the ArrayList. Now, let’s explore this concept a bit further by seeing how the List interface is declared: ...