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10_Wiki/Topic_Programming/Topic_Java/Java_Polymorphism.md

@@ -0,0 +1,70 @@
+---
+id: java-polymorphism
+title: "Java Polymorphism"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["자바 다형성"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.9
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["java", "programming", "w3schools", "oop", "polymorphism"]
+raw_sources: ["https://www.w3schools.com/java/java_polymorphism.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[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):
+```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).