public class Main {

    private static <T> Handler<AsyncResult<T>> succeededHandler(Handler<T> succeededHandler) {
        Future<T> future = Future.future();
        future.setHandler(result -> {
            if (result.succeeded()) {
                succeededHandler.handle(result.result());
            }
        });
        return future;
    }


    public static void main(String[] args) throws InterruptedException, ExecutionException {

        Future<String> succeededFuture = Future.succeededFuture("Hello");
        succeededFuture.setHandler(succeededHandler(System.out::println));
        //Prints hello

        Future<String> failedFuture = Future.failedFuture("Failure");
        failedFuture.setHandler(succeededHandler(System.out::println));
        //Nothing
    }

}