docs(10_Wiki): 위키 구조 정리 — 언어 튜토리얼 카테고리 폴더 제거 + 신규 자산 동기화

Topic_CSS/Topic_HTML/Topic_JavaScript/Topic_Prompt/Topic_Comfyui 등 기존 카테고리 폴더를 정리하고, Topic_Graphic/Dev 등 신규 산출물과 Topics 내부 세션/메모리 기록을 동기화.
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+---
+id: java-linkedlist
+title: "Java LinkedList"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["자바 LinkedList"]
+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", "collections-framework", "linkedlist"]
+raw_sources: ["https://www.w3schools.com/java/java_linkedlist.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Java LinkedList]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+ArrayList and LinkedList share the exact same List-interface methods (add/remove/set/clear) but have fundamentally different internal storage — ArrayList uses a real array that gets reallocated/copied when full, while LinkedList uses independently-linked "containers," which is why LinkedList is recommended for manipulation (insert/remove) while ArrayList wins for random access. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`LinkedList`** — nearly identical API to ArrayList; both implement `List`. [S1]
+- **Internal difference: array vs. containers** — ArrayList grows by copying into a new larger array; LinkedList links independent containers together. [S1]
+- **Use-case split** — ArrayList for storing/accessing data (random access); LinkedList for manipulating data (frequent insert/remove). [S1]
+- **LinkedList-specific methods** — `addFirst()`, `addLast()`, `removeFirst()`, `removeLast()`, `getFirst()`, `getLast()`. [S1]
+- **`var` keyword and List-typed variables** — same patterns as ArrayList (`var cars = new LinkedList<String>();`, `List<String> cars = new LinkedList<>();`). [S1]
+
+## 📖 세부 내용 (Details)
+- Basic creation: `LinkedList<String> cars = new LinkedList<String>(); cars.add("Volvo"); cars.add("BMW");`. [S1]
+- Container-based internal structure: each container links to the next; adding an element creates a new container linked into the chain (contrasted with ArrayList's array-copy growth). [S1]
+- LinkedList-specific methods: `addFirst()`, `addLast()`, `removeFirst()`, `removeLast()`, `getFirst()`, `getLast()`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **효율성 트레이드오프**: 무작위 접근이 잦으면 ArrayList가 더 효율적이지만, 특정 삽입/삭제 연산은 LinkedList 전용 메서드가 더 효율적이라는 점이 명시됨. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 데이터 접근이 목적이면 ArrayList, 데이터 조작(삽입/삭제)이 목적이면 LinkedList를 선택하는 것이 실전 가이드다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+LinkedList-specific first/last methods (Java):
+```java
+LinkedList<String> cars = new LinkedList<String>();
+cars.add("Volvo");
+cars.addFirst("Mazda"); // add to the beginning
+cars.addLast("BMW");    // add to the end
+```
+
+## ✅ 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 ArrayList]], [[Java List]], [[Java Sort List]]
+- **참조 맥락:** ArrayList의 대안 구현체 — 정렬(Sort List) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Java LinkedList — https://www.w3schools.com/java/java_linkedlist.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Java LinkedList" page (Astra wiki-curation, P-Reinforce v3.1 format).