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What is CompletableFuture.getNumberOfDependents() in Java?
abhilash
The getNumberOfDependents method is an instance method that is defined in the CompletableFuture class. The CompletableFuture class is defined in the java.util.concurrent package. This method is used to return the number of CompleteFutures that are dependent on the completion of the current CompleteFuture.
To import the CompletableFuture class, we check the following import statement:
import java.util.concurrent.CompletableFuture;
Syntax
public int getNumberOfDependents()
Parameters
This method has no parameters.
Return value
This method returns the number of dependent CompletableFutures.
Code
import java.util.concurrent.*;
public class Main {
public static void main(String[] args) {
CompletableFuture<Integer> completableFuture = new CompletableFuture<>();
completableFuture.thenApply(i -> i + 1);
completableFuture.thenApply(i -> i - 1);
System.out.println("Number of dependents - " + completableFuture.getNumberOfDependents());
completableFuture.thenApply(i -> i + 2);
System.out.println("Number of dependents - " + completableFuture.getNumberOfDependents());
}
}Implementation of the getNumberOfDependents() method
Code explanation
- Line 1: We import the relevant classes.
- Line 7: We create a new
CompletableFutureobject calledcompletableFuture. - Lines 9–10: We chain new stages to the future, using the
thenApplymethod. - Line 12: We print the number of dependent futures/stages that are added to the
completableFuturefuture. - Line 14: We add one more stage to the future, using the
thenApplymethod. - Line 16: We print the number of dependent futures/stages that are added to the
completableFuturefuture.
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abhilash
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