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10_Wiki/Dev/Topic_Java/Java_Inner_Classes.md

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+---
+id: java-inner-classes
+title: "Java Inner Classes"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["nested classes", "자바 내부 클래스"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.87
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["java", "programming", "w3schools", "oop", "inner-classes"]
+raw_sources: ["https://www.w3schools.com/java/java_inner_classes.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Java Inner Classes]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+A `static` inner class breaks the usual inner-class advantage — the source explicitly notes that unlike a regular (non-static) inner class, a static inner class does NOT have access to the outer class's members, trading outer-class access for the ability to instantiate without an outer object (`new OuterClass.InnerClass()` instead of `outer.new InnerClass()`). [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Inner (nested) class** — a class defined inside another class, grouping related classes for readability/maintainability. [S1]
+- **Access syntax** — `OuterClass.InnerClass myInner = myOuter.new InnerClass();` requires an outer instance first. [S1]
+- **Private inner class** — restricts access so outside code cannot instantiate it. [S1]
+- **Static inner class** — instantiable without an outer object (`new OuterClass.InnerClass()`), but loses access to outer-class members. [S1]
+- **Regular inner class can access outer members** — a non-static inner class's methods can read the outer class's attributes directly. [S1]
+
+## 📖 세부 내용 (Details)
+- Basic nesting: `class OuterClass { int x = 10; class InnerClass { int y = 5; } } ... OuterClass myOuter = new OuterClass(); OuterClass.InnerClass myInner = myOuter.new InnerClass(); System.out.println(myInner.y + myOuter.x); // 15`. [S1]
+- Private inner class: `private class InnerClass { int y = 5; }` — accessing it from outside causes: `error: OuterClass.InnerClass has private access in OuterClass`. [S1]
+- Static inner class: `static class InnerClass { int y = 5; } ... OuterClass.InnerClass myInner = new OuterClass.InnerClass(); // no outer instance needed`. [S1]
+- Inner class accessing outer members: `class InnerClass { public int myInnerMethod() { return x; } }` — `x` belongs to the outer class, accessible from inside. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **static 내부 클래스의 트레이드오프**: 외부 객체 없이 인스턴스화 가능하지만, 외부 클래스 멤버에 접근할 수 없다는 점이 명시적으로 강조됨. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 관련 클래스를 논리적으로 묶어 가독성을 높이는 설계 패턴이다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Inner class method accessing outer class attribute (Java):
+```java
+class OuterClass {
+    int x = 10;
+    class InnerClass {
+        public int myInnerMethod() {
+            return x;
+        }
+    }
+}
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
+- **신뢰 점수:** 0.87
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[Java Tutorial]]
+- **관련 개념:** [[Java Classes]], [[Java Modifiers]], [[Java Abstraction]]
+- **참조 맥락:** 클래스 내부에 클래스를 정의하는 구조 — 추상화(Abstraction) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Java Inner Classes — https://www.w3schools.com/java/java_inner_classes.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Java Inner Classes" page (Astra wiki-curation, P-Reinforce v3.1 format).