What is a construct in Java?

Question

Java

I started learning Java, and here is this:

import static spark.Spark.*;

public class HelloWorld {
    public static void main(String[] args) {
        get("/hello", (req, res) -> "Hello World");
    }
}

What is this construction with -> and can anyone explain the essence of this with a clever example?

Answer 1

It seems this is a lambda habrahabr.ru/post/224593

Answer 2

As I understand it, you are studying this Spark - A tiny Sinatra inspired framework for creating web applications in Java 8 with minimal effort.
If I understand correctly, then the request is "get("/hello", (req, res) -> "Hello World");" and the actual response arrives from the server.

Answer 3

Lambda
docs.oracle.com/javase/tutorial/java/javaOO/lambda...