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10_Wiki/Topic_Programming/Topic_Java/Java_Class_Attributes.md

@@ -0,0 +1,73 @@
+---
+id: java-class-attributes
+title: "Java Class Attributes"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["fields", "자바 클래스 속성"]
+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", "attributes"]
+raw_sources: ["https://www.w3schools.com/java/java_class_attributes.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Java Class Attributes]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Attributes on separate object instances are fully independent — changing `myObj2.x` to 25 leaves `myObj1.x` at its original 5, demonstrating that each object carries its own copy of non-static attribute state rather than sharing it. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Attribute** — a variable declared inside a class; also called a "field". [S1]
+- **Dot syntax access** — `myObj.x` reads or writes an attribute via an object reference. [S1]
+- **Mutation vs. override** — assigning a new value to an uninitialized field vs. changing an already-initialized field, functionally the same mechanism. [S1]
+- **`final`** — prevents overriding an attribute's value after initialization; introduced here as a preview of the Modifiers chapter. [S1]
+- **Per-object independence** — each object's attributes are separate; modifying one instance doesn't affect another. [S1]
+
+## 📖 세부 내용 (Details)
+- Access: `Main myObj = new Main(); System.out.println(myObj.x);`. [S1]
+- Modify: `myObj.x = 40;`. [S1]
+- Final (immutable) attribute: `final int x = 10; ... myObj.x = 25; // Error: cannot assign a value to a final variable`. [S1]
+- Independent instances: `myObj2.x = 25; System.out.println(myObj1.x); // 5 (unchanged) System.out.println(myObj2.x); // 25`. [S1]
+- Multiple attributes: `String fname = "John"; String lname = "Doe"; int age = 24;`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — final 키워드로 PI(3.14159...)처럼 불변 상수를 표현하는 예시가 실전 적용의 대표 사례다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Independent attribute state across objects (Java):
+```java
+Main myObj1 = new Main(); // Object 1
+Main myObj2 = new Main(); // Object 2
+myObj2.x = 25;
+System.out.println(myObj1.x); // Outputs 5
+System.out.println(myObj2.x); // Outputs 25
+```
+
+## ✅ 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 Classes]], [[Java Class Methods]], [[Java Modifiers]], [[Java Constants Final]]
+- **참조 맥락:** 클래스 변수(필드)의 접근/수정 — final 키워드는 Modifiers 챕터에서 심화.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Java Class Attributes — https://www.w3schools.com/java/java_class_attributes.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Java Class Attributes" page (Astra wiki-curation, P-Reinforce v3.1 format).