refactor(topics): 멀티 에이전트용 지식 재편 — _Common(공통 기본기) + Domain_* 구조

에이전트 8종(대화형/프로그래머 C·S/디자이너/설계자/기획자/QA/PD/PM)에게 [공통 기본 능력 + 롤별 Specialty] 2층으로 지식을 주입하기 위한 재분류. 문서 내용·포맷은 무수정, 폴더 이동만 (6,372개 문서 수 보존 확인). - Topic_Programming → Domain_Programming (내부 구조 보존) - Topic_Graphic → Domain_Design - Topic_Business → Domain_Product - Topic_General → Domain_General - _Common 신설: Math(구 Topic_Math_Specialty), Reasoning(구 General/From_Thinking & Reasoning), Reasoning_Creativity(구 General/From_창의성), Communication(Poetic_Blog_Writing + From_writing) - 타 도메인의 From_* 폴더는 유지 (출처 표기일 뿐, 이미 도메인에 맞게 분류된 문서) - 빈 폴더 정리 (memory/procedures) - 에이전트→폴더 매핑은 workspace의 .astra/agent-knowledge-map.json (9개 에이전트) Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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+---
+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).