Deprecate the `contains` method on `java.util.Hashtable`, `java.util.Properties`, and `java.util.concurrent.ConcurrentHashMap` for being confusing with `containsKey`.
--------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - Deprecate the hashtable contains methods Changes: https://git.openjdk.org/jdk/pull/33593/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=33593&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8268665 Stats: 36 lines in 3 files changed: 22 ins; 4 del; 10 mod Patch: https://git.openjdk.org/jdk/pull/33593.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/33593/head:pull/33593 PR: https://git.openjdk.org/jdk/pull/33593
