How does Stream API execution work under the hood, and when would you use a parallel stream and when wouldn't you?
~4 min by voice
How to approach it
This checks whether the candidate understands the mechanics of the Stream API (a lazy pipeline, element-by-element processing, stateful operations) and can soberly decide when a parallel stream wins and when it harms the whole application.
The interviewer will ask this question and listen. Think out loud and ask for a hint if you need one. When you're done, pause or tap “That's my answer”. In about a minute, your score and the points you covered show up here.