2nd/10_Wiki/Dev/Topic_Java/Java_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-while-loop	Java While Loop	Programming_Language	draft	conceptual		while loop 자바 while 반복문		B	0.9	2026-07-04	2026-07-04			java programming w3schools loops while	https://www.w3schools.com/java/java_while_loop.asp

Java While Loop

🎯 한 줄 통찰 (One-line insight)

A while loop's condition is checked BEFORE each iteration, so a condition that's false from the start means the loop body never runs even once — a property the source contrasts against the (not-yet-covered) do/while loop's guaranteed-first-run behavior. [S1]

🧠 핵심 개념 (Core concepts)

• while (condition) { ... } — repeats the block as long as the condition stays true. [S1]
• Counter variable i — conventional name meaning "index"/"iterator"; short and traditional. [S1]
• Must update the condition variable — forgetting i++ causes an infinite loop. [S1]
• Countdown pattern — decrementing (countdown--) works the same way. [S1]
• False-from-start behavior — if the condition is false initially, the loop body never executes. [S1]

📖 세부 내용 (Details)

• Basic counting: int i = 0; while (i < 5) { System.out.println(i); i++; }. [S1]
• Countdown: int countdown = 3; while (countdown > 0) { System.out.println(countdown); countdown--; } System.out.println("Happy New Year!!");. [S1]
• Never runs: int i = 10; while (i < 5) { System.out.println("This will never be printed"); i++; }. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 카운트다운, 조건 기반 반복의 기본형이며 do/while과의 차이가 다음 챕터의 핵심 주제다. [S1]

💻 코드 패턴 (Code patterns)

Basic while loop with counter (Java):

int i = 0;
while (i < 5) {
    System.out.println(i);
    i++;
}

✅ 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 Do While Loop, Java While Loop Real Life, Java For Loop
• 참조 맥락: 조건 기반 반복의 기본형 — do/while과의 실행 시점 차이가 핵심 대비점.

📚 출처 (Sources)

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

📝 변경 이력 (Change history)

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