2nd/10_Wiki/Dev/Topic_Java/Java_Polymorphism.md

id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit

id	title	category	status	verification_status	canonical_id	aliases	duplicate_of	source_trust_level	confidence_score	created_at	updated_at	review_reason	merge_history	tags	raw_sources	applied_in	github_commit
java-polymorphism	Java Polymorphism	Programming_Language	draft	conceptual		자바 다형성		B	0.9	2026-07-04	2026-07-04			java programming w3schools oop polymorphism	https://www.w3schools.com/java/java_polymorphism.asp

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).