RFR: 8314877: Make fields final in 'java.net' package [v2]

[Andrey Turbanov]

> A few classes in `java.net` package have non-final fields which could easily be marked `final`.

Andrey Turbanov has updated the pull request incrementally with one additional commit since the last revision:

  8314877: Make fields final in 'java.net' package
  
  make java.net.URL.handlers private

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/15358/files
  - new: https://git.openjdk.org/jdk/pull/15358/files/bd4c9f45..74636379

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15358&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15358&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 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