This repository contains examples and explanations of key Java 8 features, including Lambda Expressions, Functional Interfaces, Optional Class, and Stream API.Each section demonstrates the new functionalities introduced in Java 8 to promote efficient and concise coding practices.
Folder Structure
1.Function_Interface & Lambda Expression:
This folder demonstrates how to create and use functional interfaces and lambda expressions to write concise and anonymous methods.
2.Stream_Api:
Examples of intermediate and terminal methods used in the Stream API for handling and processing collections.
3.Optional_class.txt:
This file provides details on how to handle null values using the Optional class, preventing NullPointerException.
Features Covered
1.Lambda Expressions
Lambda expressions were introduced in Java 8 to provide a concise way to write anonymous methods. They can be used with functional interfaces, which contain only one abstract method.
2.Functional Interfaces
A functional interface is an interface that contains only one abstract method, and it can be implemented using a lambda expression. Predefined functional interfaces include ActionListener, Runnable, and user-defined interfaces.
3.Optional Class
The Optional class was introduced in Java 8 to handle null values more gracefully, avoiding NullPointerException. It is a container that may or may not contain a non-null value. Methods of the Optional class include creating empty Optionals, Optionals with non-null values, and Optionals that can hold either a non-null value or null.
4.Stream API
The Stream API is used to process collections of objects in a functional programming manner.
It supports two types of operations:
Intermediate Operations: These return a new stream and are lazy.
Terminal Operations: These produce a result or a side-effect.