This PR reorganizes `java.util.zip.ZipCoder` class hierarchies to handle UTF-8 in the base class and move support for general charsets down to a subclass. This better reflects reality where most ZIP files are encoded using UTF-8.
The motivation can be summarized as: * Supporting the common case in the base class and the exceptional case in a subclass seems more natural and intuitive for maintainers * We avoid loading both classes for most JVM instances * A small performance improvement is observed, probably caused by unlocking effecively-monomorphic JVM optimizations See core-libs-dev discussion for details: https://mail.openjdk.org/pipermail/core-libs-dev/2026-January/158281.html I have tried to not move methods around too much, making the side-by-side diff when ignoring whitespace easier to review. We can discuss further cleanups and reorganizaton if so desired. It may be useful to review commits individually. The first commit fe4a627 moves some methods out the way for the second commit 2926398. This PR also includes the similar change to the `ZipFileSystem` implementation of ZipCoder to keep these aligned. Could be pulled out to a separate PR if reviewers want to focus on a single area per PR. ------------- Commit messages: - Make ZipFS ZipCoder base class UTF-8 to align with java.util.zip.ZipCoder - Merge branch 'master' into zipcoder-utf8-baseclass - Merge branch 'master' into zipcoder-utf8-baseclass - Reorganize such that the ZipCoder base class now handles UTF-8 and the new subclass CharsetZipCoder handles arbitrary charsets - Move some method out of the way for reorg Changes: https://git.openjdk.org/jdk/pull/30640/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=30640&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8376842 Stats: 423 lines in 2 files changed: 178 ins; 172 del; 73 mod Patch: https://git.openjdk.org/jdk/pull/30640.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/30640/head:pull/30640 PR: https://git.openjdk.org/jdk/pull/30640
