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-data-structures
+title: "Java Data Structures"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["자바 자료구조 개요"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.88
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["java", "programming", "w3schools", "data-structures"]
+raw_sources: ["https://www.w3schools.com/java/java_data_structures.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Java Data Structures]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The choice between ArrayList/HashSet/HashMap comes down to a single 3-column decision table (order-kept? duplicates-allowed? best-for) — order+duplicates → ArrayList, uniqueness → HashSet, key-based lookup → HashMap, giving a fast heuristic before diving into each structure's details. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Data structure** — a way to store/organize data efficiently; arrays are the simplest example. [S1]
+- **`ArrayList`** — resizable array; keeps insertion order; allows duplicates; access by index. [S1]
+- **`HashSet`** — every element unique; adding a duplicate is silently ignored; no fixed order. [S1]
+- **`HashMap`** — stores key-value pairs for fast lookup by key; keys unique, values can duplicate. [S1]
+- **Iterator** — a standard way to loop through any data structure via `hasNext()`/`next()`. [S1]
+
+## 📖 세부 내용 (Details)
+- ArrayList: `ArrayList<String> cars = new ArrayList<String>(); cars.add("Volvo"); cars.add("BMW"); ...`. [S1]
+- HashSet dedup: `HashSet<String> cars = new HashSet<String>(); cars.add("BMW"); cars.add("BMW"); // duplicate ignored`. [S1]
+- HashMap key-value: `HashMap<String, String> capitalCities = new HashMap<String, String>(); capitalCities.put("England", "London"); ...`. [S1]
+- Iterator loop: `Iterator<String> it = cars.iterator(); while(it.hasNext()) { System.out.println(it.next()); }`. [S1]
+- Comparison table: ArrayList (ordered, duplicates OK, index access), HashSet (unique, no order, fast checks), HashMap (key-value, no order, fast key lookup). [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 국가-수도 매핑(HashMap)이 키 기반 조회의 대표 예시다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Quick comparison: ArrayList, HashSet, HashMap (Java):
+```java
+ArrayList<String> cars = new ArrayList<String>(); // ordered, duplicates OK
+HashSet<String> uniqueCars = new HashSet<String>(); // unique only
+HashMap<String, String> capitalCities = new HashMap<String, String>(); // key-value
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
+- **신뢰 점수:** 0.88
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[Java Tutorial]]
+- **관련 개념:** [[Java Collections]], [[Java List]], [[Java Set]], [[Java Map]], [[Java Iterator]]
+- **참조 맥락:** 자료구조 전체 섹션의 개념적 도입부 — Collections Framework 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Java Data Structures — https://www.w3schools.com/java/java_data_structures.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Java Data Structures" page (Astra wiki-curation, P-Reinforce v3.1 format).