This PR includes:
- Reduce else if condition. I think this make code more readable
- Polish diamond operator usage
- Polish Map#isEmpty usage
Comment From: sdeleuze
Merged except FastByteArrayOutputStream changes since it does not achieve consistency class-wide. Notice I do not ask a follow-up PR for FastByteArrayOutputStream.
I appreciate the contributions but we need to be mindful of reaching a certain level of added value, otherwise we could spend too much energy reviewing Spring Framework codebase polishes. So for upcoming PRs, I will ask more clear added value for refinements, and otherwise will reject the related PRs. Thanks for your undertanding.