docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합

이전 재구성 작업에서 Dev/ 폴더가 누락되었던 것을 반영.

- Dev/Topic_Programming(중첩 폴더, 78개)은 Dev 자체 최상위 폴더들
  (Architecture/Conventions/Engineering_Intelligence 등)과 완전 중복이라 제거.
- Dev 최상위 엔지니어링 지식 폴더(Architecture/Conventions/Engineering_Intelligence/
  Failure_Library/Generalized_Principles/Language/Pattern_Catalog/Platform_Guides/
  Subsystems, 77개)는 이미 Topic_Programming/Topic_Programming에 더 최신 버전이
  존재해 중복 제거(고유 콘텐츠 1개는 예외 처리하여 이동 보존).
- Dev의 W3Schools 언어 튜토리얼 폴더(Topic_C/CPP/CSS/CSharp/HOWTO/HTML/Java/
  JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동.
- 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리.
- Topic_Programming 최종 문서 수: 2784 → 3985.
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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).