The fields of `ListSelectionEvent` are set in the constructor and are never modified, mark the fields — `firstIndex`, `lastIndex`, `isAdjusting` — with the `final` modifier.
------------- Commit messages: - 8348308: Make fields of ListSelectionEvent final Changes: https://git.openjdk.org/jdk/pull/23243/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23243&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8348308 Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod Patch: https://git.openjdk.org/jdk/pull/23243.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/23243/head:pull/23243 PR: https://git.openjdk.org/jdk/pull/23243
