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What is completable future?

Pragya Keshap answered on February 22, 2023 Popularity 7/10 Helpfulness 1/10

answer What is completable future?

What is completable future?

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A CompletableFuture is an extension to Java's Future API which was introduced in Java 8.

A Future is used for asynchronous Programming. It provides two methods, isDone() and get(). The methods retrieve the result of the computation when it completes.

Limitations of the Future

A Future cannot be mutually complete.

We cannot perform further action on a Future's result without blocking.

Future has not any exception handling.

We cannot combine multiple futures.

import java.util.Arrays;  
import java.util.List;  
import java.util.concurrent.CompletableFuture;  
public class CompletableFutureExample1   
{  
public static void main(String[] args)   
{  
try  
{  
List<Integer> list = Arrays.asList(5,9,14);  
list.stream().map(num->CompletableFuture.supplyAsync(()->getNumber(num))).map(CompletableFuture->CompletableFuture.thenApply(n-  
>n*n)).map(t->t.join()).forEach(s->System.out.println(s));  
}  
catch (Exception e)  
{  
e.printStackTrace();  
}  
}  
private static int getNumber(int a)  
{  
return a*a;  
}  
}

Popularity 7/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java

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Contributed on Feb 22 2023

Pragya Keshap

0 Answers Avg Quality 2/10

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