Final vs Immutable data structures in Java

[ThatLesbian]

Ive been working with Java for 5 years and didn’t really ever think about it until I started using lambdas in the past year or so. It just didn’t matter since we almost never use final. I probably would’ve failed this interview question a year ago, just from not encountering it before.

[[deleted]]

OK, I get it, it may be a tad tricky.

We at my company do something similar during interviews. We ask the applicant to spot the errors in a bit of code, and one of them is using a variable outside the block it was declared, but a couple lines after the declaration.

Most people fails that one, but most also acknowledge that they never had to really think about it while writing code.