2nd/10_Wiki/Dev/Topic_Java/Java_Else.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-else	Java Else	Programming_Language	draft	conceptual		else statement 자바 else		B	0.88	2026-07-04	2026-07-04			java programming w3schools conditions else	https://www.w3schools.com/java/java_conditions_else.asp

Java Else

🎯 한 줄 통찰 (One-line insight)

A stray semicolon after if (condition) silently breaks an if/else pair — the source explicitly warns that if (condition); ends the statement early, making the following else behave unexpectedly (or fail to compile as attached to that if). [S1]

🧠 핵심 개념 (Core concepts)

• else — runs a block only when the paired if condition is false; else itself carries no condition. [S1]
• Syntax — if (condition) { ... } else { ... }. [S1]
• No semicolon after if(condition) — doing so ends the if-statement prematurely and breaks the else pairing. [S1]

📖 세부 내용 (Details)

• Basic else: boolean isRaining = false; if (isRaining) { System.out.println("Bring an umbrella!"); } else { System.out.println("No rain today, no need for an umbrella!"); }. [S1]
• Time-based greeting: int time = 20; if (time < 18) { System.out.println("Good day."); } else { System.out.println("Good evening."); } // Outputs "Good evening.". [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

• 세미콜론 함정: if (condition) 뒤에 세미콜론을 붙이면 안 된다는 점이 소스에서 별도 Notes로 강조됨. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 시간대별 인사말, 비/우산 여부 등 이진 분기의 표준 패턴이다. [S1]

💻 코드 패턴 (Code patterns)

Binary branch with else (Java):

int time = 20;
if (time < 18) {
    System.out.println("Good day.");
} else {
    System.out.println("Good evening.");
}

✅ 검증 상태 및 신뢰도

• 상태: draft
• 검증 단계: conceptual
• 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
• 신뢰 점수: 0.88
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: Java Tutorial
• 관련 개념: Java If Else, Java Else If
• 참조 맥락: if의 false 분기 처리 — else if로 다중 조건 분기 확장.

📚 출처 (Sources)

• [S1] W3Schools — Java Else — https://www.w3schools.com/java/java_conditions_else.asp

📝 변경 이력 (Change history)

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