2nd/10_Wiki/Dev/Topic_Java/Java_Do_While_Loop.md

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
java-do-while-loop	Java Do While Loop	Programming_Language	draft	conceptual		do-while loop 자바 do-while 반복문		B	0.9	2026-07-04	2026-07-04			java programming w3schools loops do-while	https://www.w3schools.com/java/java_while_loop_do.asp

Java Do While Loop

🎯 한 줄 통찰 (One-line insight)

The do/while loop's defining trait is executing the body BEFORE the first condition check — even with int i = 10; do {...} while (i < 5);, the false-from-the-start condition still lets the body run exactly once, the exact opposite of a plain while loop. [S1]

🧠 핵심 개념 (Core concepts)

• do { ... } while (condition); — runs the block once, then repeats while the condition holds. [S1]
• Required semicolon — the ; after while (condition) is mandatory. [S1]
• Guaranteed first run — unlike while, the body always executes at least once, regardless of the initial condition. [S1]
• Use case — anything that must happen at least once, e.g. showing a message or prompting for input. [S1]

📖 세부 내용 (Details)

• Basic do/while: int i = 0; do { System.out.println(i); i++; } while (i < 5);. [S1]
• False-from-start still runs once: int i = 10; do { System.out.println("i is " + i); i++; } while (i < 5); — prints once despite the condition being false immediately. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

• while 루프와의 핵심 차이: while은 조건이 처음부터 거짓이면 아예 실행되지 않지만, do/while은 최소 한 번은 실행된다는 점이 명시적으로 대비됨. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 사용자 입력 프롬프트, 메뉴 표시 등 "최소 1회 실행" 이 필요한 상황에 사용된다. [S1]

💻 코드 패턴 (Code patterns)

Do/while always runs once, even with a false-from-start condition (Java):

int i = 10;
do {
    System.out.println("i is " + i);
    i++;
} while (i < 5);

✅ 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 While Loop, Java For Loop
• 참조 맥락: while 루프의 변형 — 최소 1회 실행 보장이 핵심 차이.

📚 출처 (Sources)

• [S1] W3Schools — Java Do/While Loop — https://www.w3schools.com/java/java_while_loop_do.asp

📝 변경 이력 (Change history)

• 2026-07-04: Initial draft synthesized from the W3Schools "Java Do/While Loop" page (Astra wiki-curation, P-Reinforce v3.1 format).