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최상위 10_Wiki/Topic_*였던 4개 카테고리 폴더를 10_Wiki/Topics/Topic_* 로 재배치. 콘텐츠 변경 없음(순수 폴더 이동) — Topics/ 하위 나머지 폴더는 이미 지난 커밋에서 전부 정리된 상태(잔존 항목은 에이전트 운영 상태 및 사용자가 보존을 요청한 업데이트0615/무제 3.canvas 뿐).
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+---
+id: java-switch
+title: "Java Switch"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["switch statement", "자바 스위치문"]
+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", "switch"]
+raw_sources: ["https://www.w3schools.com/java/java_switch.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Java Switch]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+`break` is what makes switch a selection statement rather than a fallthrough executor — without it, execution would continue into subsequent case blocks; `default` is the only branch exempt from needing a trailing break, since it's already last. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`switch(expression)`** — evaluates once, compares result against each `case` value. [S1]
+- **`case x:`** — a branch that runs if expression matches x. [S1]
+- **`break`** — exits the switch block once a match's code has run, saving execution time by skipping remaining cases. [S1]
+- **`default:`** — runs when no case matches; does not need `break` if it's the last statement. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **break as an efficiency device** — the source frames break not just as correctness but as performance: it "ignores the execution of all the rest of the code in the switch block," implying omitting it costs unnecessary case comparisons/execution. [S1]
+
+## 📖 세부 내용 (Details)
+- Weekday example: `int day = 4; switch (day) { case 1: ... case 4: System.out.println("Thursday"); break; ... } // Outputs "Thursday"`. [S1]
+- Default fallback: `int day = 4; switch (day) { case 6: ...; case 7: ...; default: System.out.println("Looking forward to the Weekend"); } // Outputs "Looking forward to the Weekend"`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **default의 break 생략 가능**: default가 마지막 문장일 경우 break가 필요 없다는 점이 소스에서 명시됨. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 다중 else-if 체인을 대체하는 표준 다지선다 분기 구조다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Switch with default fallback (Java):
+```java
+int day = 4;
+switch (day) {
+    case 6:
+        System.out.println("Today is Saturday");
+        break;
+    case 7:
+        System.out.println("Today is Sunday");
+        break;
+    default:
+        System.out.println("Looking forward to the Weekend");
+}
+```
+
+## ✅ 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 Else If]], [[Java Break Continue]], [[Java While Loop]]
+- **참조 맥락:** 다중 분기의 대안 구조 — break 키워드는 이후 반복문(loop)에서도 재등장.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Java Switch — https://www.w3schools.com/java/java_switch.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Java Switch Statements" page (Astra wiki-curation, P-Reinforce v3.1 format).