2nd/10_Wiki/Dev/Topic_Java/Java_Nested_If.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-nested-if	Java Nested If	Programming_Language	draft	conceptual		자바 중첩 조건문		B	0.87	2026-07-04	2026-07-04			java programming w3schools conditions nested-if	https://www.w3schools.com/java/java_conditions_nested.asp

Java Nested If

🎯 한 줄 통찰 (One-line insight)

A nested if only evaluates its inner condition once the outer condition is already true — this makes it functionally different from && combined into one condition, since it lets each level print/branch independently (e.g., "old enough to vote" prints regardless of citizenship, but the vote permission itself depends on both). [S1]

🧠 핵심 개념 (Core concepts)

• Nested if — placing an if statement inside another if. [S1]
• Purpose — check a second condition only when the first is already true. [S1]
• Depth caution — the source explicitly warns against nesting too deep, as it can hurt readability. [S1]
• Combines with else/else if — nested if is often paired with else at each level for full decision trees. [S1]

📖 세부 내용 (Details)

• Basic nesting: int x = 15; int y = 25; if (x > 10) { System.out.println("x is greater than 10"); if (y > 20) { System.out.println("y is also greater than 20"); } }. [S1]
• Voting + citizenship real-life example: int age = 20; boolean isCitizen = true; if (age >= 18) { System.out.println("Old enough to vote."); if (isCitizen) { System.out.println("And you are a citizen, so you can vote!"); } else { System.out.println("But you must be a citizen to vote."); } } else { System.out.println("Not old enough to vote."); }. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 서로 의존적인 여러 조건(나이+시민권 등)을 검사할 때 표준적으로 쓰인다. [S1]

💻 코드 패턴 (Code patterns)

Nested if with independent inner else (Java):

int age = 20;
boolean isCitizen = true;
if (age >= 18) {
    System.out.println("Old enough to vote.");
    if (isCitizen) {
        System.out.println("And you are a citizen, so you can vote!");
    } else {
        System.out.println("But you must be a citizen to vote.");
    }
} else {
    System.out.println("Not old enough to vote.");
}

✅ 검증 상태 및 신뢰도

• 상태: draft
• 검증 단계: conceptual
• 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
• 신뢰 점수: 0.87
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: Java Tutorial
• 관련 개념: Java If Else, Java Conditions Logical Operators, Java Conditions Real Life
• 참조 맥락: 서로 의존적인 다중 조건 판단 — 논리 연산자(&&)와 함께 자주 결합됨.

📚 출처 (Sources)

• [S1] W3Schools — Java Nested If — https://www.w3schools.com/java/java_conditions_nested.asp

📝 변경 이력 (Change history)

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