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.

10_Wiki/Topic_Programming/Topic_Java/Java_Projects.md

@@ -0,0 +1,72 @@
+---
+id: java-projects
+title: "Java Projects"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["자바 실습 프로젝트"]
+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", "projects"]
+raw_sources: ["https://www.w3schools.com/java/java_projects.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Java Projects]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The student-average project deliberately validates input BEFORE processing (`if (count < 1 || count > 5) { ...; return; }`), demonstrating that a real small project isn't just "loop + math" — it's the combination of Scanner input, validation/early-return, a loop-based accumulator, and a helper method (`gradeFunction`) that turns tutorial-sized concepts into a working mini-application. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Why build projects** — understand real program structure, practice combining concepts, improve debugging skills, prepare for interviews. [S1]
+- **Progression** — start with simple I/O (name/age greeting), then loop+condition+array projects (shopping list, guessing game, student average), then class/file-based projects (calculator, address book, to-do list, quiz game). [S1]
+- **Featured project: Student Average** — combines Scanner input, input validation with early return, an accumulator loop, and a helper method mapping a numeric average to a letter grade. [S1]
+
+## 📖 세부 내용 (Details)
+- Input validation with early return: `if (count < 1 || count > 5) { System.out.println("Invalid number. You must enter between 1 and 5 grades."); scanner.close(); return; }`. [S1]
+- Accumulator loop: `double sum = 0.0; for (int i = 1; i <= count; i++) { double grade = scanner.nextDouble(); sum += grade; } double avg = sum / count;`. [S1]
+- Helper method mapping average to letter grade: `static char gradeFunction(double avg) { if (avg >= 90) return 'A'; else if (avg >= 80) return 'B'; else if (avg >= 70) return 'C'; else if (avg >= 60) return 'D'; else return 'F'; }`. [S1]
+- Practice challenge: shopping list using an array, with an extra challenge to add item search. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+학생 평균 성적 계산 프로그램이 Scanner 입력, 유효성 검증, 누적 반복, 헬퍼 메서드를 결합한 실전 미니 애플리케이션의 대표 사례다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Average-to-letter-grade helper method (Java):
+```java
+static char gradeFunction(double avg) {
+    if (avg >= 90) return 'A';
+    else if (avg >= 80) return 'B';
+    else if (avg >= 70) return 'C';
+    else if (avg >= 60) return 'D';
+    else return 'F';
+}
+```
+
+## ✅ 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 User Input]], [[Java Methods Return]], [[Java Arrays]], [[Java Advanced Sorting]]
+- **참조 맥락:** Java 튜토리얼 전체의 최종 종합 실습 챕터 — Scanner/메서드/배열/조건문 등 전 과정을 통합.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Java Projects — https://www.w3schools.com/java/java_projects.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Java Projects" page (Astra wiki-curation, P-Reinforce v3.1 format).