Add java.util.Locale compatibility runtime

[dlunch]

Summary

• add a minimal java.util.Locale runtime class with Java 1.1-style constructors, constants, default locale, accessors, equality, hashCode, clone, toString, and lightweight display/ISO helpers
• register Locale in the runtime loader and java.util module exports
• add java_runtime tests for constants, constructors, default locale behavior, null rejection, and unsupported ISO3 handling

Validation

• cargo test -p java_runtime test_locale
• previously also ran cargo test -p java_runtime classes::java::util and cargo test during implementation

[codecov]

Codecov Report

❌ Patch coverage is 92.98246% with 52 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.71%. Comparing base (1a39271) to head (5054b77).

Files with missing lines	Patch %	Lines
java_runtime/src/classes/java/util/locale.rs	92.97%	52 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #171      +/-   ##
==========================================
+ Coverage   83.14%   83.71%   +0.56%     
==========================================
  Files         170      171       +1     
  Lines       12126    12867     +741     
==========================================
+ Hits        10082    10771     +689     
- Misses       2044     2096      +52     

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[Copilot]

Pull request overview

This PR adds a minimal java.util.Locale runtime implementation to the java_runtime crate, wires it into the runtime class loader, and introduces tests to validate basic Locale behavior in the JVM harness.

Changes:

• Implement java/util/Locale runtime class (constructors, constants, default locale, accessors, equality/hashCode/clone/toString, and basic ISO/display helpers).
• Register Locale in the runtime loader and export it from java_runtime::classes::java::util.
• Add java_runtime tests for Locale constants, constructors, default-locale behavior, null rejection, and unsupported ISO3 handling.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
java_runtime/src/classes/java/util/locale.rs	New java.util.Locale runtime class implementation and behavior.
java_runtime/src/loader.rs	Registers Locale so it can be resolved/loaded at runtime.
java_runtime/src/classes/java/util.rs	Adds locale module + re-exports Locale.
java_runtime/tests/classes/java/util/test_locale.rs	New tests for Locale constants/constructors/default/edge cases.
java_runtime/tests/classes/java/util/mod.rs	Includes the new test_locale module in the test suite.

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