Null Check to avoid Null pointer exception

Question

I have something like this:

   request.getData().getPerson().getAddress().getZipcode()

I am looking for efficient way to do the null check but don't want to add many if's . I have similar thing in many places and looking for the best way to address this.

Thanks in advance.

This `request.getData().getPerson().getAddress().getZipcode()` is a code smell in and of itself. — Fildor, Feb 01 '23 at 16:02
Please see message chains in code smell and also Law of Demeter for programming. — Tia, Feb 01 '23 at 16:07

score 3 · Accepted Answer · answered Feb 01 '23 at 16:06

3

You can use Optional.

Optional.ofNullable(request).map(x -> x.getData()).map(x -> x.getPerson())
        .map(x -> x.getAddress()).map(x -> x.getZipcode()).orElse(null);

answered Feb 01 '23 at 16:06

Unmitigated

76,500
11
62
80

@user16320675 I would have used those if I knew the names of the classes. – Unmitigated Feb 01 '23 at 16:45
That looks like a good approach. – FigureCodeOut Feb 03 '23 at 17:39

Null Check to avoid Null pointer exception

1 Answers1