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79 lines
3.4 KiB
Markdown
79 lines
3.4 KiB
Markdown
---
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id: java-switch
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title: "Java Switch"
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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: ["switch statement", "자바 스위치문"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.9
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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", "switch"]
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raw_sources: ["https://www.w3schools.com/java/java_switch.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[Java Switch]]
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## 🎯 한 줄 통찰 (One-line insight)
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`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]
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## 🧠 핵심 개념 (Core concepts)
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- **`switch(expression)`** — evaluates once, compares result against each `case` value. [S1]
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- **`case x:`** — a branch that runs if expression matches x. [S1]
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- **`break`** — exits the switch block once a match's code has run, saving execution time by skipping remaining cases. [S1]
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- **`default:`** — runs when no case matches; does not need `break` if it's the last statement. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **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]
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## 📖 세부 내용 (Details)
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- Weekday example: `int day = 4; switch (day) { case 1: ... case 4: System.out.println("Thursday"); break; ... } // Outputs "Thursday"`. [S1]
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- 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]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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- **default의 break 생략 가능**: default가 마지막 문장일 경우 break가 필요 없다는 점이 소스에서 명시됨. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — 다중 else-if 체인을 대체하는 표준 다지선다 분기 구조다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Switch with default fallback (Java):
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```java
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int day = 4;
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switch (day) {
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case 6:
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System.out.println("Today is Saturday");
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break;
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case 7:
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System.out.println("Today is Sunday");
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break;
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default:
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System.out.println("Looking forward to the Weekend");
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}
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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:** 0.90
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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 Else If]], [[Java Break Continue]], [[Java While Loop]]
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- **참조 맥락:** 다중 분기의 대안 구조 — break 키워드는 이후 반복문(loop)에서도 재등장.
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## 📚 출처 (Sources)
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- [S1] W3Schools — Java Switch — https://www.w3schools.com/java/java_switch.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "Java Switch Statements" page (Astra wiki-curation, P-Reinforce v3.1 format).
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