Looking at these examples, I got a beginner question.
Is there some best practice guidelines when it comes to using Java methods?
In a productive code can I use deliberatedly?

A filtered array's length will never be less than 0.

See my answer to your other post.

Read the instructions, please:

If the list is made up of only negative numbers, return 0 instead.

Why does it have to be 0? It would make sence if it was -1 because [-1] is subarray with the gretest sum, isn't it?

[-2, -1, -3, -4, -1, -2, -1, -5, -4]
-1 should equal 0

Probably not correct :(

And you can very efficiently use the spoiler flag, in this kind of situation... ;p