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Antigravity Agent e9cbf23ab5 docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합

이전 재구성 작업에서 Dev/ 폴더가 누락되었던 것을 반영.

- Dev/Topic_Programming(중첩 폴더, 78개)은 Dev 자체 최상위 폴더들
  (Architecture/Conventions/Engineering_Intelligence 등)과 완전 중복이라 제거.
- Dev 최상위 엔지니어링 지식 폴더(Architecture/Conventions/Engineering_Intelligence/
  Failure_Library/Generalized_Principles/Language/Pattern_Catalog/Platform_Guides/
  Subsystems, 77개)는 이미 Topic_Programming/Topic_Programming에 더 최신 버전이
  존재해 중복 제거(고유 콘텐츠 1개는 예외 처리하여 이동 보존).
- Dev의 W3Schools 언어 튜토리얼 폴더(Topic_C/CPP/CSS/CSharp/HOWTO/HTML/Java/
  JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동.
- 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리.
- Topic_Programming 최종 문서 수: 2784 → 3985.

2026-07-05 00:39:13 +09:00

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title

Java Polymorphism

🎯 한 줄 통찰 (One-line insight)

Declaring Animal myPig = new Pig(); — parent type on the left, subclass instance on the right — is the exact mechanism that lets myPig.animalSound() call Pig's overridden version, not Animal's default: polymorphism means the SAME method call resolves differently depending on the actual object type, not the declared variable type. [S1]

🧠 핵심 개념 (Core concepts)

Polymorphism — "many forms"; occurs when related classes (via inheritance) implement the same method differently. [S1]
Method overriding across subclasses — each subclass (Pig, Dog) provides its own animalSound() implementation. [S1]
Same action, different behavior — calling animalSound() on different object types produces different output through one shared method name. [S1]
Parent-typed reference to subclass instance — Animal myPig = new Pig(); is valid and dispatches to Pig's override. [S1]

📖 세부 내용 (Details)

Overridden methods: class Animal { public void animalSound() { System.out.println("The animal makes a sound"); } } class Pig extends Animal { public void animalSound() { System.out.println("The pig says: wee wee"); } } class Dog extends Animal { public void animalSound() { System.out.println("The dog says: bow wow"); } }. [S1]
Polymorphic dispatch: Animal myAnimal = new Animal(); Animal myPig = new Pig(); Animal myDog = new Dog(); myAnimal.animalSound(); myPig.animalSound(); myDog.animalSound(); — each call produces the subclass-specific sound. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — Animal/Pig/Dog 계층은 다형성 개념의 표준 교육용 예제다. [S1]

💻 코드 패턴 (Code patterns)

Polymorphic method dispatch via parent-typed references (Java):

Animal myAnimal = new Animal();
Animal myPig = new Pig();
Animal myDog = new Dog();
myAnimal.animalSound(); // The animal makes a sound
myPig.animalSound();    // The pig says: wee wee
myDog.animalSound();    // The dog says: bow wow

✅ 검증 상태 및 신뢰도

상태: draft
검증 단계: conceptual
출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
신뢰 점수: 0.90
중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

상위/루트: Java Tutorial
관련 개념: Java Inheritance, Java Super Keyword, Java Abstraction, Java Interface
참조 맥락: 상속 기반 메서드 오버라이딩의 활용 — super 키워드 챕터로 이어짐.

📚 출처 (Sources)

[S1] W3Schools — Java Polymorphism — https://www.w3schools.com/java/java_polymorphism.asp

📝 변경 이력 (Change history)

2026-07-04: Initial draft synthesized from the W3Schools "Java Polymorphism" page (Astra wiki-curation, P-Reinforce v3.1 format).

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