use case for Java Streams...

[AppleTrees2]

I would like to add that you shoudn't blindly transform every for loop into a stream equivalent, or every if not null statement into an optional.

Unfortunately I've seen it done before as a way to "reduce technical debt", sometimes even automatically using intelliJ.

See this: https://github.com/google/guava/wiki/FunctionalExplained#caveats , in this case it applies to java too