What are the key features introduced in Java 8? Provide examples of lambda expressions and functional programming in Java.

Java 8 introduced several key features that significantly enhanced the language and opened up new possibilities for developers. Here's an in-depth answer explaining some of the key features introduced in Java 8, including lambda expressions and functional programming: 1. Lambda Expressions: Lambda expressions are a powerful feature introduced in Java 8 that enables functional programming in Java. They provide a concise way to represent anonymous functions, allowing developers to write more compact and expressive code. Lambda expressions are primarily used in functional interfaces, which are interfaces with a single abstract method. Some key points about lambda expressions include: * Syntax: Lambda expressions consist of a set of parameters, an arrow operator (`->`), and a body. The parameters represent the input to the function, the arrow operator separates the parameters from the body, and the body contains the code to be executed. * Compactness: Lambda expressions eliminate the need to write verbose anonymous inner classes, reducing the code size and improving readability. * Functional Interfaces: Lambda expressions are mo....