Java 8 Stream API Tutorial

This is a complete an in-depth tutorial, we will go through the practical usage of Java 8 Streams.
Source code examples and practices described in this tutorial are well tested in our development environment and have been written using JDK 8 or later.


To understand this tutorial, you need to have a basic knowledge of Java 8 (lambda expressions, Optional, method references) and of the Stream API. If you aren’t familiar with these topics, please take a look at our previous articles on Java 8 Tutorial.

Streams are an update to the Java API that lets you manipulate collections of data in a declarative way. Java provides a new additional package in Java 8 called java.util.stream. This package consists of classes, interfaces, and an enum to allows functional-style operations on the elements. You can use stream by importing java.util.stream package in your programs.

It is complex to cover all the topics of Java 8 Stream API tutorial in single article hence we divided into separate articles for simplicity.

>> Java 8 Stream APIs with Examples

In this article, we will learn the overview of Streams and explored Stream APIs with examples. Read more on Java 8 Stream APIs with Examples

>> Ways of Creating a Stream in Java 8

In this article, we have discussed 8 different ways of creating a Stream object in Java 8. Read more on 8 Ways of Creating a Stream in Java 8

>>  Collections Aggregate Operations

In this article, we will learn a new way to process collections of an object using Java 8 Streams that are added to Java Collections API. Read more on Collections Aggregate Operations

>> Stream Reduction Operations

In this article, we will discuss general purpose reduction operations which are used using Collections. Read more on Stream Reduction Operations

>> How to Use Java 8 Stream API in Java Projects

As we have learned lot many things from above articles so it's time to use Java 8 Stream APIs in real projects. In this article, we will discuss the use case of using Streams in enterprise Java web applications such as we retrieve an object from the database and convert it into DTO and then send DTO as JSON back to Client applications. Read more on How to Use Java 8 Stream API in Java Projects

>> Different Ways to Iterate over List, Set and Map in Java

In this article, we will discuss different ways to iterate over the List, Set and Map in Java 7 and 8. Read more on Different Ways to Iterate over List, Set and Map in Java

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