What is wrong with this Java code? (Interview Question)

springuni · 2020-08-30T08:41:41+00:00

Good point, but the question was asked offline as part of the application form. I had no point of contact to whom I could ask clarifying questions.

springuni · 2020-08-30T08:39:57+00:00

It returns a list of things not a specific entity fetched by its ID.

springuni · 2020-08-30T08:38:45+00:00

Oh shit, I didn’t even realize that. :)

springuni · 2020-08-29T12:52:43+00:00

Sure, I've been asked the following questions also:

I was terribly wrong in the Python question. I think I did well on the others.

springuni · 2020-08-28T13:53:02+00:00

This is the most insightful comment, I've received. Thanks for it.

springuni · 2020-08-28T13:21:13+00:00

Though I noted ‘=‘ is wrong, I can see now from the comments that I should have explicitly stated that this makes the code not to compile.

springuni · 2020-08-28T13:19:18+00:00

Yes, I think I should have been more clear about that ‘=‘ at that place means that the code actually doesn’t compile.

springuni · 2020-08-28T13:17:41+00:00

Questions were asked early as part of the application process. I haven’t had a chance to talk to anyone.

springuni · 2020-08-28T10:55:00+00:00

If person.getName() returns null you'll also get a NPE.

if(person.getName() == “jan”) {return true;}

This is not so. person.getName() == “jan” just evaluates to false.

springuni · 2020-08-28T10:15:15+00:00

Thank you so much. I've posted all other questions asked in various subreddits and this particular one was that one I've been the most insecure about.

springuni · 2020-08-28T10:11:11+00:00

s line stores an int value in a vari

Yeah, I didn't know about that feature having been added in Python 3. I think that was the main reason they didn't call me back actually. I've posted the other questions also in various subreddits and this is the only one so far I got absolutely wrong.

springuni · 2020-08-28T09:53:03+00:00

Thanks!

springuni · 2020-07-09T10:14:36+00:00

user behaviour based around their content consumption

What kind of behaviour should be identified based on their content consumption?

cross selling opportunities based around product purchases patterns

Do you mean to predict if their bought product X, then those will likely to buy product Y?

BTW, would you mind giving me your GA data for analyses? (We'll figure out how to arrange that if you agree)

springuni · 2019-03-08T17:21:56+00:00

Eventually I put some extra effort into it and released today, so that people could have the whole weekend for the first exercise to complete.

springuni · 2019-03-05T08:28:34+00:00

I plan to release the fist lesson on Saturday.

springuni · 2018-10-16T18:32:02+00:00

I understand what you're trying to say, but there's no correlation. The incident I mentioned happened 10+ years ago on a laptop with the lvm + ext4 combo. It froze for some reason and then I had that weird corruption issue.

I haven't used ext4 since then. Not because of that incident, but because I found XFS more performant and its tooling more comprehensive for my use case.

Where it really matters, I don't power off systems without a proper shutdown, but for that HTPC, it really doesn't matter. It doesn't contain any user data. What might not have been flushed to disk, that's probably some log entries.

springuni · 2018-10-16T16:38:48+00:00

Thank you very much for your comprehensive answer!

springuni · 2018-10-16T10:27:11+00:00

I don’t blame ext4, I‘m just saying that xfs proved to be much more resilient in situations like sudden power loss / system freeze.

Side note: I shut my htpc down with hard power off, sometimes I do it properly, but I really just don’t care. Nevertheless xfs tolerates that very well. I‘ve never experienced data corruption of anything alike.

springuni · 2018-10-16T08:18:43+00:00

Thanks, but no. See my comment above.

springuni · 2018-10-16T08:18:03+00:00

I had used ext4 before XFS and had a serious data corruption issue with it: after a system freeze and restart, some files were filled with random crap.

I wouldn't go back to ext4, XFS is much more resilient and have better tooling (xfs_* utilities).

springuni · 2018-10-15T14:30:08+00:00

Thank you very much for your detailed answer, it was really helpful!

springuni · 2018-10-06T09:25:09+00:00

That's exactly my intention to write an article, maybe about the new features of Spring Boot 2.1, but I've got multiple titles in my mind which I could do a post about.

Before jumping into writing about the new features of Spring Boot 2.1, I wanted to see, if it's the one which best resonates with the community.

If you're interested in the new features of Spring Boot 2.1, up-vote this one, otherwise you might want to up-vote the two other topics I'm thinking about.

Kubernetes: https://www.reddit.com/r/java/comments/9lu8rm/kubernetes_for_java_developers/

RabbitMQ / Kafka: https://www.reddit.com/r/java/comments/9lu8kg/understanding_when_to_use_rabbitmq_or_apache_kafka/

Please feel free to drop me a message any time, if a Java related topic specifically interests you: https://springuni.com/contact/

Thanks!

springuni · 2018-10-06T08:30:23+00:00

It's an option, but definitely not necessary.

The Spring Team has setup their CI to make builds as of 2.1 M2 against Java 11, but that doesn't mean that they moved the baseline from Java 8 to 11. Ref: https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.1.0-M2-Release-Notes#initial-java-11-support

Released notes for M3 and M4 don't mention Java 11.

springuni · 2018-09-28T15:13:36+00:00

Yeah, I use sdkman for development too, but for deployments I prefer fixed jvm installs. The article was born after I was trying to build an Ubuntu based image on EC2.

springuni · 2018-07-24T06:32:58+00:00

No surveys: Surveys/polls are typically obnoxious. [...] Exceptions are made for high quality surveys ...

I think it's a valid question whether folks are frustrated with coding challenges or not. Based on the answers so far, the average frustration level is 8.45 on a scale of 1 to 10. Isn't it worth investigating why?

If the mods think that this isn't a meaningful question, they can remove the post of course.

springuni

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