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3.4 KiB
3.4 KiB
id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit
| id | title | category | status | verification_status | canonical_id | aliases | duplicate_of | source_trust_level | confidence_score | created_at | updated_at | review_reason | merge_history | tags | raw_sources | applied_in | github_commit | |||||||
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| java-switch | Java Switch | Programming_Language | draft | conceptual |
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B | 0.9 | 2026-07-04 | 2026-07-04 |
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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 eachcasevalue. [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 needbreakif 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):
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).