Antigravity Agent
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Topic_CSS/Topic_HTML/Topic_JavaScript/Topic_Prompt/Topic_Comfyui 등 기존 카테고리 폴더를 정리하고, Topic_Graphic/Dev 등 신규 산출물과 Topics 내부 세션/메모리 기록을 동기화.
73 lines
3.7 KiB
Markdown
73 lines
3.7 KiB
Markdown
---
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id: java-projects
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title: "Java Projects"
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category: "Programming_Language"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["자바 실습 프로젝트"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.87
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created_at: 2026-07-04
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updated_at: 2026-07-04
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review_reason: ""
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merge_history: []
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tags: ["java", "programming", "w3schools", "projects"]
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raw_sources: ["https://www.w3schools.com/java/java_projects.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[Java Projects]]
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## 🎯 한 줄 통찰 (One-line insight)
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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]
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## 🧠 핵심 개념 (Core concepts)
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- **Why build projects** — understand real program structure, practice combining concepts, improve debugging skills, prepare for interviews. [S1]
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- **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]
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- **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]
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## 📖 세부 내용 (Details)
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- 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]
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- Accumulator loop: `double sum = 0.0; for (int i = 1; i <= count; i++) { double grade = scanner.nextDouble(); sum += grade; } double avg = sum / count;`. [S1]
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- 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]
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- Practice challenge: shopping list using an array, with an extra challenge to add item search. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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소스에서 모순되는 정보는 발견되지 않음.
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## 🛠️ 적용 사례 (Applied in summary)
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학생 평균 성적 계산 프로그램이 Scanner 입력, 유효성 검증, 누적 반복, 헬퍼 메서드를 결합한 실전 미니 애플리케이션의 대표 사례다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Average-to-letter-grade helper method (Java):
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```java
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static char gradeFunction(double avg) {
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if (avg >= 90) return 'A';
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else if (avg >= 80) return 'B';
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else if (avg >= 70) return 'C';
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else if (avg >= 60) return 'D';
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else return 'F';
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}
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```
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.87
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[Java Tutorial]]
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- **관련 개념:** [[Java User Input]], [[Java Methods Return]], [[Java Arrays]], [[Java Advanced Sorting]]
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- **참조 맥락:** Java 튜토리얼 전체의 최종 종합 실습 챕터 — Scanner/메서드/배열/조건문 등 전 과정을 통합.
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## 📚 출처 (Sources)
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- [S1] W3Schools — Java Projects — https://www.w3schools.com/java/java_projects.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "Java Projects" page (Astra wiki-curation, P-Reinforce v3.1 format).
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