What are some examples of functional programming in Java?

What are some examples of functional programming in Java?

Functional programming in Java can be demonstrated using features like lambda expressions, streams, and method references. For example, using a lambda expression to sort a list of strings: Collections.sort(list, (s1, s2) -> s1.compareTo(s2));.

Can you explain how streams work in functional programming?

Sure! Streams in Java allow you to process sequences of elements, such as collections, in a functional style. You can perform operations like filtering, mapping, and reducing. For instance, to filter a list of numbers to only even ones, you can use: list.stream().filter(n -> n % 2 == 0).collect(Collectors.toList());.

What is a method reference in Java?

A method reference is a shorthand notation of a lambda expression to call a method. For example, instead of using a lambda to print each element in a list, you can use a method reference: list.forEach(System.out::println);.

Can you give me a real-world example of functional programming in Java?

Certainly! A real-world example could be processing a list of transactions in a financial application. You could use streams to filter transactions by type, map them to a summary, and then reduce them to a total amount.