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10_Wiki/Dev/Topic_Java/Java_Modifiers.md

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+---
+id: java-modifiers
+title: "Java Modifiers"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["access modifiers", "자바 접근 제어자"]
+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", "modifiers", "access-control"]
+raw_sources: ["https://www.w3schools.com/java/java_modifiers.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Java Modifiers]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Classes only get two access modifier choices (`public`/default), while attributes/methods/constructors get four (`public`/`private`/default/`protected`) — the extra granularity for members exists because access control needs to operate at a finer level than whole-class visibility. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Access modifier** — controls the access level of classes, attributes, methods, constructors. [S1]
+- **For classes** — `public` (accessible by any class) or `default` (package-only, used when no modifier is specified). [S1]
+- **For members (attributes/methods/constructors)** — `public`, `private` (class-only), `default` (package-only), `protected` (package + subclasses). [S1]
+- **Real-life analogy** — public = public park (anyone enters); private = house key (only you). [S1]
+
+## 📖 세부 내용 (Details)
+- Public vs. private: `class Person { public String name = "John"; private int age = 30; } ... p.name // works; p.age // Error: age has private access in Person`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — public/private 분리는 캡슐화(Encapsulation) 챕터의 직접적 기반이다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Public vs. private attribute access (Java):
+```java
+class Person {
+    public String name = "John"; // accessible everywhere
+    private int age = 30;        // only accessible inside this class
+}
+```
+
+## ✅ 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 Non Access Modifiers]], [[Java Encapsulation]], [[Java Packages]], [[Java Inheritance]]
+- **참조 맥락:** 접근 제어자의 기초 — 캡슐화/패키지/상속 챕터로 확장.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Java Modifiers — https://www.w3schools.com/java/java_modifiers.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Java Modifiers" page (Astra wiki-curation, P-Reinforce v3.1 format).