Expand Java 1.2 runtime API compatibility

[dlunch]

Summary

• expand Java 1.2/CLDC/CDC-compatible java.lang and java.io APIs
• complete core collection contracts, list/tree implementations, algorithms, wrappers, timers, properties, random, and timezone behavior
• add JVM support for thread interruption, array/class metadata, and option-based file opening
• add broad runtime and compiled-Java regression coverage

Validation

• cargo test --workspace (419 passed, 1 ignored)
• cargo clippy -p java_runtime --all-targets -- -D warnings
• cargo fmt --all -- --check
• git diff --check

[Copilot]

Copilot wasn't able to review this pull request because it exceeds the maximum number of lines (20,000). Try reducing the number of changed lines and requesting a review from Copilot again.

[codecov]

Codecov Report

❌ Patch coverage is 93.35323% with 824 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.35%. Comparing base (7dc1b90) to head (78e9bd1).

Files with missing lines	Patch %	Lines
java_runtime/src/classes/java/util/vector.rs	63.73%	70 Missing ⚠️
java_runtime/src/classes/java/io/print_writer.rs	83.20%	68 Missing ⚠️
...me/src/classes/java/util/abstract_list_sub_list.rs	75.86%	56 Missing ⚠️
java_runtime/src/classes/java/util/linked_list.rs	85.41%	42 Missing ⚠️
..._runtime/src/classes/java/util/timer_task_queue.rs	65.25%	41 Missing ⚠️
...ava_runtime/src/classes/java/io/buffered_reader.rs	91.74%	34 Missing ⚠️
...ava_runtime/src/classes/java/util/abstract_list.rs	88.40%	32 Missing ⚠️
...e/src/classes/java/util/collections_copies_list.rs	82.31%	29 Missing ⚠️
java_runtime/src/classes/java/util/arrays.rs	95.95%	26 Missing ⚠️
java_runtime/src/classes/java/util/properties.rs	92.04%	26 Missing ⚠️
... and 55 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #190      +/-   ##
==========================================
+ Coverage   86.89%   90.35%   +3.46%     
==========================================
  Files         208      265      +57     
  Lines       20420    32303   +11883     
==========================================
+ Hits        17744    29188   +11444     
- Misses       2676     3115     +439     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 6309d4757a

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".