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

이전 재구성 작업에서 Dev/ 폴더가 누락되었던 것을 반영. - Dev/Topic_Programming(중첩 폴더, 78개)은 Dev 자체 최상위 폴더들 (Architecture/Conventions/Engineering_Intelligence 등)과 완전 중복이라 제거. - Dev 최상위 엔지니어링 지식 폴더(Architecture/Conventions/Engineering_Intelligence/ Failure_Library/Generalized_Principles/Language/Pattern_Catalog/Platform_Guides/ Subsystems, 77개)는 이미 Topic_Programming/Topic_Programming에 더 최신 버전이 존재해 중복 제거(고유 콘텐츠 1개는 예외 처리하여 이동 보존). - Dev의 W3Schools 언어 튜토리얼 폴더(Topic_C/CPP/CSS/CSharp/HOWTO/HTML/Java/ JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동. - 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리. - Topic_Programming 최종 문서 수: 2784 → 3985.
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+---
+id: java-nested-if
+title: "Java Nested If"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["자바 중첩 조건문"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.87
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["java", "programming", "w3schools", "conditions", "nested-if"]
+raw_sources: ["https://www.w3schools.com/java/java_conditions_nested.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[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):
+```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).