import java.util.concurrent.*;

​

public class Main {

    public static void main(String[] args) {

        CompletableFuture<Integer> completableFuture = new CompletableFuture<>();

        RuntimeException runtimeException = new RuntimeException("Runtime Exception");

        boolean flag = completableFuture.completeExceptionally(runtimeException);

        if(flag) System.out.println("Future moved to completed stage");

        if(completableFuture.isCompletedExceptionally()) System.out.println("Future completed exceptionally");

        Integer result = null;

        try {

            result = completableFuture.get();

        } catch (InterruptedException | ExecutionException e) {

            System.out.println("Exception while getting the result of the future. " + e.getMessage());

        }

        System.out.println("Result - " + result);

    }

}