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java-oop-assignment

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Completes Java OOP university assignments from PDF specifications with minimal implementation. Use when user provides a PDF assignment file or mentions completing a Java/FOP/OOP homework exercise. Focuses on writing the least code necessary to satisfy requirements.

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I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/development/java-oop-assignment/SKILL.md

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Java OOP Assignment Solver

Philosophy

KISS + YAGNI: Write the minimum code to pass. Less code = less to review = fewer bugs.

Workflow

Phase 1: Understand

  1. Read the PDF - Extract all requirements, class diagrams, method signatures
  2. Explore codebase - Find existing templates, enums, helper classes marked @DoNotTouch
  3. Identify tasks - List each numbered requirement (H6.1, H6.2, etc.)

Phase 2: Plan

Create a todo list with:

  • Files to CREATE (interfaces, enums, classes)
  • Files to MODIFY (implement methods, add implements)
  • Implementation order (dependencies first)

Phase 3: Implement

For each task:

  1. Interfaces/Enums first - No dependencies
  2. Abstract classes - Base functionality
  3. Concrete classes - Extend/implement
  4. Modify existing - Add interface implementations, fill in TODO methods
  5. Remove crash() calls - Replace crash("H6.X") with actual implementation

Phase 4: Verify

  1. Build with Gradle: ./gradlew compileJava
  2. Run main if playground exists: ./gradlew run
  3. Check output matches PDF examples

Implementation Rules

Minimal Code

  • No extra comments unless logic is unclear
  • No extra validation unless specified
  • No helper methods unless reused 3+ times
  • Match exact signatures from PDF (visibility, types, names)

PDF Reading Tips

  • Class diagrams: Solid arrow = extends, dashed arrow = implements
  • "protected": Accessible to subclasses
  • "private final": Immutable, set in constructor
  • Mandatory requirements in boxes: Must follow exactly

Modern Java Idioms

Use the following for code conciseness, elegance and brevity.

  • Switch expressions (->) - returns value, no break needed, fewer lines
  • Pattern matching instanceof - cast + variable binding in one check
  • var - type inference for locals, less redundancy
  • Ternary operator - one-liner conditionals over if-else blocks
  • Math.min/max - bounds checking without branching
  • Records - immutable data classes in one line (if allowed)
  • Text blocks (""") - multi-line strings without concatenation

Gradle Notes

  • If build fails with version error, try: JAVA_HOME=/path/to/jdk21 ./gradlew build
  • @StudentImplementationRequired("H6.X") marks methods to implement
  • Remove crash("H6.X") calls when implementing

Checklist

  • All TODO comments addressed
  • All crash() calls removed
  • All interfaces/classes from diagram created
  • Build succeeds
  • Run output matches PDF examples (if playground provided)