[nogridbag]

Yeah that first example is rather poor. And it uses the word boilerpate to seemingly refer to the stuff unrelated to the async code (class declaration, exception handling, main method).

I don't use Java async much, but I guess if you have a utility method named "setTimeout" than the example can simply be:

    public CompletableFuture<String> fetchData() {
        return setTimeout(() -> "Data Fetched", 10000);
    }

    public void loadData() {
        fetchData().thenAccept(System.out::println);
    }

Which is simpler or equivalent to the JS example.