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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
java-switch Java Switch Programming_Language draft conceptual
switch statement
자바 스위치문
B 0.9 2026-07-04 2026-07-04
java
programming
w3schools
switch
https://www.w3schools.com/java/java_switch.asp

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):

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)

📚 출처 (Sources)

📝 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).