Java 8 Stream API Tutorial

In this complete and in-depth tutorial, we will go through the practical usage of Java 8 Stream APIs.

YouTube Video - Java 8 Stream API Course

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.

Check out Java 8 Tutorials at https://www.javaguides.net/p/java-8.html.

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

Streams are an update to the Java API that lets you manipulate data collections declaratively. Java provides a new package in Java 8 called java.util.stream. This package consists of classes, interfaces, and an enum to allow 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 Java 8 Stream API tutorial topics in a single article; hence, we divided it into separate articles for simplicity.

Java 8 Stream Tutorials and Examples:

• Java Stream Terminal Operations Examples - Learn important Stream terminal operations with an example.

• Java Stream Intermediate Operations Examples - - Learn important Stream intermediate operations with an example.

• Java 8 Stream Tutorial for Beginners - Getting started tutorial on Java 8 Stream API for beginners.

• Java 8 Stream - Creating Stream Objects Example - Learn how to create Stream objects from different sources such as Collection, Array, String, etc.

• Java 8 Stream - filter() and forEach() Example - Learn how to filter and iterate using filter() and forEach() methods.

• Java 8 Lambda - Sort List in Ascending and Descending Order | Comparator Example - Learn how to sort a List of objects in ascending and descending order using Lambda.

• Java Sort List (ArrayList) in Ascending and Descending Order using Java 8 Stream API Learn how to sort a List of objects in ascending and descending order using Stream.

• Java 8 Stream APIs with Examples - In this article, we will learn the overview of Streams and explore 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 the Java Collections API. Read more on Collections Aggregate Operations. 

• Stream Reduction Operations - In this article, we will discuss general-purpose reduction operations that are used in Collections. Read more on Stream Reduction Operations 

• How to Use Java 8 Stream API in Java Projects - As we have learned from the above articles, it's time to use Java 8 Stream APIs in real projects. In this article, we will discuss the use of Streams in enterprise Java web applications, such as retrieving an object from the database, converting it into DTO, and then sending 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 

• Java 8 Stream - filter() and forEach() Example - In this tutorial, we will learn how to use Stream.filter() and Stream.forEach() method with an example. 

• Java 8 Lambda - Sort List in Ascending and Descending Order | Comparator Example - In this tutorial, we will see how to sort List (ArrayList) in ascending and descending order using Java Lambda expressions.  

• Java Sort List (ArrayList) in Ascending and Descending Order using Java 8 Stream API - In this tutorial, we will see how to sort List (ArrayList) in ascending and descending order using Java 8 Stream APIs.

Java 8 Stream API Methods

• Java Stream toArray() Example
• Java Stream reduce() Example
• Java Stream max() Example
• Java Stream min() Example
• Java Stream forEach() Example
• Java Stream findFirst() Example
• Java Stream findAny() Example
• Java Stream count() Example
• Java Stream collect() Example
• Java Stream noneMatch() Example
• Java Stream allMatch() Example
• Java Stream anyMatch() Example
• Java Stream peek() Example
• Java Stream limit() Example
• Java Stream distinct() Example
• Java Stream map() Example
• Java Stream filter() Example
• Java Stream sorted() Example
• Java Stream skip() Example
• Java Stream concat Example
• Java Stream empty() Example
• Java Stream flatMapToDouble Example
• Java Stream flatMapToInt Example
• Java Stream forEachOrdered Example
• Java Stream mapToDouble Example
• Java Stream mapToInt Example
• Java Stream mapToLong Example
• Java DoubleStream
• Java IntStream
• Java LongStream

Java 8 Main Features

• Java 8 Lambda Expressions
• Java 8 Functional Interfaces
• Java 8 Method References
• Java 8 Stream API
• Java 8 Optional Class
• Java 8 Collectors Class
• Java 8 StringJoiner Class
• Java 8 Static and Default Methods in Interface