[diegourban]

Clean-code PR B of 4 (formatting ✅ → final → Javadoc → approved findings).

Commits

1. 5c6d4e9 Add final: 872 modifiers across 108 files (library and problems).
   • Parameters: every one (Q2). No method anywhere reassigns a parameter, so none had to stay non-final (Q7).
   • Locals: every one that's never reassigned, including final var in problems and for-each variables (Q3).
   • Fields: those assigned once (Q4).
   • Classes: the 10 static-only classes (Q5).
   • How: OpenRewrite recipes (FinalizeMethodArguments, FinalizeLocalVariables, FinalizePrivateFields, FinalClass), plus for-each variables and a handful of parameters by hand.
   • Verified mechanically: with every final keyword and all whitespace removed, each file is identical to before (872 added, 0 removed).
2. 418b1ce Enforce with PMD: config/pmd/final-modifiers.xml with four rules: MethodArgumentCouldBeFinal, LocalVariableCouldBeFinal, ImmutableField and ClassWithOnlyPrivateConstructorsShouldBeFinal.
   • maven-pmd-plugin 3.28.0 with PMD 7.29.0. pmd:check runs in verify over main and test sources and fails on any violation.
   • The "could be final" rules ignore variables that are reassigned, so a loop counter or accumulator is never flagged.
   • Checked that it fails: removing a single final makes ./mvnw verify fail ("PMD has found 1 violation").
   • Commit 1 is added to .git-blame-ignore-revs.

⚠️ Merge with a merge commit, so the .git-blame-ignore-revs hash stays valid.

Codacy (manual step for you)

In Codacy → algorithms-java → Code patterns → PMD, turn on the same four patterns so PR comments match the build:

• Method Argument Could Be Final
• Local Variable Could Be Final
• Immutable Field
• Class With Only Private Constructors Should Be Final

Test plan

• ./mvnw verify: 591 tests, Spotless, PMD and coverage floors all pass
• CI, Codacy, Codecov green

🤖 Generated with Claude Code

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.65%. Comparing base (ec46c94) to head (418b1ce).

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #13   +/-   ##
=========================================
  Coverage     99.65%   99.65%           
  Complexity      279      279           
=========================================
  Files            24       24           
  Lines           576      576           
  Branches         94       94           
=========================================
  Hits            574      574           
  Partials          2        2           

☔ 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.

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

🟢 Metrics 0 complexity · 8 duplication

Metric	Results
Complexity	0
Duplication	8

View in Codacy

AI Reviewer: first review requested successfully. AI can make mistakes. Always validate suggestions.

_{TIP This summary will be updated as you push new changes.}

[codacy-production]

Pull Request Overview

✅ No blocking issues noticed

No blocking findings were identified. The remaining gap is that PMD enforcement scenarios are not covered by automated build or fixture tests, including verification for both production and test sources.

About this PR

• Consider adding automated build-fixture or integration tests that verify each required final-modifier rule and confirm PMD runs against both production and test sources.

Test suggestions

• Existing algorithm and data-structure behavior remains unchanged after modifier-only changes.
• A missing final parameter is detected by the PMD build.
• A missing final local variable is detected by the PMD build.
• A missing final field is detected by the PMD build.
• A static-only class made non-final is detected by the PMD build.
• PMD enforcement applies to test sources as well as production sources.

Prompt proposal for missing tests

Consider implementing these tests if applicable:
1. A missing final parameter is detected by the PMD build.
2. A missing final local variable is detected by the PMD build.
3. A missing final field is detected by the PMD build.
4. A static-only class made non-final is detected by the PMD build.
5. PMD enforcement applies to test sources as well as production sources.

Make this review better

_{TIP Add a ticket key to the branch or title so the reviewer can check the PR against it. Or tell us which ticket tracker you use here.
TIP Add Codacy review.md instructions or an AGENTS.md so the reviewer knows your conventions.}

_{TIP How was this review? Give us feedback}

[codacy-production]

_{🟡 MEDIUM RISK}

Suggestion: The two triangle helpers duplicate the array construction and sorting logic. Extract a private helper that returns the sorted sides, then reuse it in both methods to reduce maintenance risk.

See Clone in Codacy

_{TIP React 👍 if this review is right, or reply with what's wrong and how it could be better to help improve the reviewer.}