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71 lines
3.4 KiB
Markdown
71 lines
3.4 KiB
Markdown
---
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id: java-linkedhashmap
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title: "Java LinkedHashMap"
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category: "Programming_Language"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["자바 LinkedHashMap"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.89
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created_at: 2026-07-04
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updated_at: 2026-07-04
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review_reason: ""
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merge_history: []
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tags: ["java", "programming", "w3schools", "collections-framework", "linkedhashmap"]
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raw_sources: ["https://www.w3schools.com/java/java_linkedhashmap.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[Java LinkedHashMap]]
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## 🎯 한 줄 통찰 (One-line insight)
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LinkedHashMap completes the exact same three-way pattern seen in the Set hierarchy (HashSet/TreeSet/LinkedHashSet) — HashMap (no order, fastest), TreeMap (sorted, slowest), LinkedHashMap (insertion order, middle ground) — showing Java's Collections Framework applies this identical order/speed trade-off symmetrically across both Set and Map implementations. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **`LinkedHashMap`** — stores key-value pairs, preserving INSERTION order (not sorted order). [S1]
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- **Same API as HashMap/TreeMap** — `put()`, `get()`, `remove()`, `clear()`, `size()`, `keySet()`, `values()`. [S1]
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- **Duplicate key handling** — same as HashMap: re-putting an existing key overwrites its value silently. [S1]
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- **Performance** — slightly slower than HashMap due to order tracking (same trade-off pattern as LinkedHashSet vs. HashSet). [S1]
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## 📖 세부 내용 (Details)
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- Insertion-order preservation: `LinkedHashMap<String, String> capitalCities = new LinkedHashMap<>(); capitalCities.put("England", "London"); capitalCities.put("India", "New Dehli"); ... // {England=London, India=New Dehli, Austria=Wien, Norway=Oslo, USA=Washington DC} — insertion order preserved`. [S1]
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- Comparison table: HashMap (no order, faster random access) vs. LinkedHashMap (insertion order preserved, slightly slower). [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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소스에서 모순되는 정보는 발견되지 않음.
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — 입력된 순서 그대로 국가-수도 목록을 유지해야 할 때 LinkedHashMap이 적합하다. [S1]
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## 💻 코드 패턴 (Code patterns)
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LinkedHashMap preserves insertion order (Java):
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```java
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LinkedHashMap<String, String> capitalCities = new LinkedHashMap<>();
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capitalCities.put("England", "London");
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capitalCities.put("India", "New Dehli");
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capitalCities.put("Austria", "Wien");
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System.out.println(capitalCities);
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// {England=London, India=New Dehli, Austria=Wien}
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```
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.89
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[Java Tutorial]]
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- **관련 개념:** [[Java HashMap]], [[Java TreeMap]], [[Java Iterator]]
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- **참조 맥락:** Map 구현체의 마지막 — Iterator 챕터로 이어짐(모든 자료구조 공통 순회 도구).
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## 📚 출처 (Sources)
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- [S1] W3Schools — Java LinkedHashMap — https://www.w3schools.com/java/java_linkedhashmap.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "Java LinkedHashMap" page (Astra wiki-curation, P-Reinforce v3.1 format).
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