Java : Must Know Functional Programming Features

Ways to Make Java Functionally Fun

Functional programming brings clarity and efficiency to Java applications. In this guide, we’ll explore ten strong functional programming features available in Java, explained in simple language with practical code examples to help you improve your coding skills.

Lambda Expressions

Lambda expressions enable you to treat functionality as method arguments or code as data. They provide a clear and concise way to implement single-method interfaces (functional interfaces) using an expression.

List<String> names = Arrays.asList("Alice", "Bob", "Charlie");
names.forEach(name -> System.out.println(name));

The lambda expression name -> System.out.println(name) passes each element of the list names to the printlnmethod.

Functional Interfaces

A functional interface is an interface that contains exactly one abstract method. They can be implemented using lambda expressions, method references, or anonymous classes.

@FunctionalInterface
interface Greeting {
    void sayHello(String name);
}

public class FunctionalInterfaceExample {
    public static void main(String[] args) {
        Greeting greeting = (name) ->…