Swift week Pre-Christmas sale
Save up to 80 % on Swift e-learning! Only this week!
Christmas are almost here! Get up to 20 % extra points for free! More info

Lesson 12 - Multithreading in Java - CompletableFuture

In the previous lesson, Multithreading in Java - ForkJoinPool, we talked about ForkJoinPool. In this lesson, we're going to learn what is in my opinion the best class for parallel programming offered by the basic Java Concurrency framework - CompletableFuture.

A few lessons back, we introduced different interfaces related to parallel programming: Runnable, Callable, and Future. The interfaces are ordered according to the increasing functionality. We described the Future interface as an object that will contain the result of a task sometime in the future. The problem with this interface is that we don't know when the result will be available. The only way to get the result is to use the blocking get() method, which blocks the thread in which it's called. The developers tried to solve this problem by using the CompletableFuture class and I must say that they did great. Let's introduce CompletableFuture.

CompletableFuture

Right at the beginning I have to say that if you know something about reactive programming, you will feel at home. Alternatively, you can find many similarities to the promises from JavaScript.

The class implements two interfaces:


 

...End of the preview...

Premium article

Premium article

ict.social is a large database made up of manuals and tutorials, whose main goal is to provide high-quality IT education to everyone. We started out in the Czech republic, where we display roughly a million articles per month and receive plenty of gratitude from our users. Thanks to our successful establishment, we are now bringing these articles to the rest of the world.

Although we are trying to keep our content free of charge, maintaining the site is a huge effort for everyone involved. Therefore, some content (exercises and more advanced material) costs network points. Don't worry, they're really cheap :)

Article description

Requested article covers this content:

In this tutorial, we'll introduce advanced techniques for parallel programming in Java. Let's describe CompletableFuture.

Limited offer: Learn all knowledge and save money

Buy articles and tests separately one by one 102 points
Buy the course including all articles and features for an exclusive price 87 points
Currently, you have 0 points
By buying this exclusive package, you'll have access to all 13 articles in this course including exercise submitting while saving $1.38. This offer is limited for the first articles only with an additional exclusive 15% discount.
You gain 87 points for adding an article to the site, or for $9.18 $7.80

Buy just this article

Warning, by buying just this article you'll lose the limited 15% discount for the package of all the articles.

To access the article, you need 10 points
Currently, you have 0 points
You gain 10 points for adding an article to the site, or for $0.90

Buying this article gives you unlimited access to it forever. You will learn some more and help us keep giving our site maintenance which helps you and others get better futures. It's a win-win.

This article is licensed :Premium, by buying this article, you agree with the terms of use.

You gain points by supporting our network. This is done by sending a helpful amount of money to support the site, or by creating content for the network.

You can get points immediately using:

Credit card SMS Wire transfer
Credit card SMS Wire transfer

 

Activities (2)