`java.util.concurrent.ConcurrentHashMap` is relatively old and has not been updated to reflect the current state of Java and can be modernized:
* Add `@Serial` annotations * Seal classes and restrict subclassing for internal classes * Use pattern matching for instance * Remove redundant modifiers (such as some final declarations) * Use Objects.requireNonNull for invariant checking * Use diamond operators instead of explicit types * Simplify expressions using Math::max ------------- Commit messages: - Untrack file - Modernize ConcurrentHashMap Changes: https://git.openjdk.org/jdk/pull/11924/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11924&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8299852 Stats: 385 lines in 1 file changed: 14 ins; 22 del; 349 mod Patch: https://git.openjdk.org/jdk/pull/11924.diff Fetch: git fetch https://git.openjdk.org/jdk pull/11924/head:pull/11924 PR: https://git.openjdk.org/jdk/pull/11924
