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Antigravity Agent e9cbf23ab5 docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합

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- Topic_Programming 최종 문서 수: 2784 → 3985.

2026-07-05 00:39:13 +09:00

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title

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).

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