Java 8 CompletableFuture Tutorial with Examples | runAsync() & supplyAsync() | JavaTechie | Part 1

In this tutorial I’ll give you a detailed explanation of CompletableFuture and all its methods using simple examples
This is part 1 video where we discussed below context

What is completableFuture
Why CompletableFuture where already we have Future in java 5
How to create Completablefuture
How to use runAsync and supply Async method with use case

#javatechie #Java8 #CompletableFuture @Multithreading

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[indraalapati]

Thank you Basant for making this. I would like to add one more point as completable future by default uses forkjoin pool, this pool has core pool size, if the application is IO intensive it is good to use overloaded constructor (thread pool) to achieve max throughput.

[abhishakchauhan]

Suppose in 1 function you have execute three method inside CF and T1, T2, T3 start
Now on T1 thread, in this method i want to split in more sub task because i have some complex logic in first method
T1. 1
T1. 2
T1. 3

[likithr.n]

Can there be a better explanation than this, really awesome man!

[PradeepKumar-dbpe]

Thanks @JavaTechie! One Question - when you write Do we conditionally complete it using if? or it is completed by auto-detecting the blocking state?

[insane]

Hi java techie bro need video tutorials of
1.Aws batch to implement cron jobs in spring boot
2.Implementing swagger into your microservice and using swagger to generate client call stubs
3.Implementing elastic search for search in your spring boot modules
Please make these tutorials also!!!!

[anantv]

In the future object, can we use try catch block to handle exceptions ?

[shubhampatidar]

I like your code proof for everything - Thanks for your continuity

[adityavyas]

Thanks @Basant thank you for this wonderful tutorial...

[farhaankazi]

Hi Java Techie, You gave the example of runAsync(). In that you called get(). My question is that is correct that the main thread calls get() method of completable future instance, because in that case only CompletableFuture will get chance to complete processing. CompletableFuture has Daemon threads if main thread dies then daemon will be automatically died. If we did not use get method rather we use callback then we have to make the main thread sleep for seconds so that CompletableFuture and its callback will get chance to complete process otherwise daemon threads of CompletableFuture, will die along with main thread of JVM.

[sateesh]

very good video for completable future videos

[psudhakarreddy]

Thank you bro. I learned many things from your channel.

[preetird]

Hi sir could you please make a video on how to mock "supplyAsync" method of completablefuture in Junit class. I'm stuck there and tried everything possible on GitHub and stack overflow. It's failing or going into infinite loop.
The scenario is that supplyAsync method is overridden in the class.

[sumitsaurav]

In future itself we can also pass timeout into get method to manually complete the thread

[vipulnigam]

We can use invokeAll() by adding all these futures in list

[venkatah]

Thank you for this video and this will be really helpful for one of my tasks that i am working on. Thank you for your efforts.

[yogeshchaudhary]

Thanks for explaining in the simplest way possible.

[MuraliM.A.]

Thanks for the video, what is the advantage using own executors over the global poo thread?

[noumaanmohammad]

Awesome video. get method wont be blocking main thread until supply async completes its task? If yes can we have whencomplete method?

[VenkatBujjam]

Please do a video on to clarify callable, completablefuture and executor.

[PandiSundaram-vr]

Good explanation keep it up. Include where to shutdown executor