A few classes in `java.net` package have non-final fields which could easily be marked `final`.
------------- Commit messages: - [PATCH]: Make fields final java.net Changes: https://git.openjdk.org/jdk/pull/15358/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15358&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8314877 Stats: 31 lines in 10 files changed: 3 ins; 7 del; 21 mod Patch: https://git.openjdk.org/jdk/pull/15358.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/15358/head:pull/15358 PR: https://git.openjdk.org/jdk/pull/15358
