Java8-CompletableFuture

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;

public class CompletableFuture1 {

    public static void main(String[] args) throws ExecutionException, InterruptedException {
        CompletableFuture<String> future = new CompletableFuture<>();

        future.complete("42");

        future
                .thenAccept(System.out::println)
                .thenAccept(v -> System.out.println("done"));

    }

}