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Antigravity Agent e9cbf23ab5 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.

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

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title

Java BufferedWriter

🎯 한 줄 통찰 (One-line insight)

BufferedWriter's newLine() is the platform-independent way to insert line breaks — unlike hardcoding "\n" in a string, newLine() uses the correct line separator for whatever OS the program runs on, though the source primarily frames it as a convenience method rather than a portability guarantee. [S1]

🧠 핵심 개념 (Core concepts)

BufferedWriter — writes text line/string at a time; must be paired with FileWriter (which opens/creates the file). [S1]
.newLine() — inserts a line break, an alternative to embedding \n manually. [S1]
Default overwrite — like FileWriter, replaces existing file content unless append mode is used. [S1]
Append mode — pass true to the underlying FileWriter constructor: new FileWriter("filename.txt", true). [S1]

📖 세부 내용 (Details)

Basic write with newLine(): try (BufferedWriter bw = new BufferedWriter(new FileWriter("filename.txt"))) { bw.write("First line"); bw.newLine(); bw.write("Second line"); } catch (IOException e) {...}. [S1]
Append mode: try (BufferedWriter bw = new BufferedWriter(new FileWriter("filename.txt", true))) { bw.newLine(); bw.write("Appended line"); }. [S1]
Class comparison: FileWriter (simple/quick), BufferedWriter (faster for large files, easy newLine()), FileOutputStream (binary files). [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 여러 줄의 텍스트를 newLine()으로 구분하며 파일에 쓰는 표준 패턴이다. [S1]

💻 코드 패턴 (Code patterns)

Writing multiple lines with newLine() (Java):

try (BufferedWriter bw = new BufferedWriter(new FileWriter("filename.txt"))) {
    bw.write("First line");
    bw.newLine(); // add line break
    bw.write("Second line");
    System.out.println("Successfully wrote to the file.");
} catch (IOException e) {
    System.out.println("Error writing file.");
}

✅ 검증 상태 및 신뢰도

상태: draft
검증 단계: conceptual
출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
신뢰 점수: 0.88
중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

상위/루트: Java Tutorial
관련 개념: Java BufferedReader, Java FileOutputStream, Java Files Write
참조 맥락: 버퍼링을 통한 빠른 텍스트 쓰기 — Data Structures & Collections 섹션으로 이어짐.

📚 출처 (Sources)

[S1] W3Schools — Java BufferedWriter — https://www.w3schools.com/java/java_bufferedwriter.asp

📝 변경 이력 (Change history)

2026-07-04: Initial draft synthesized from the W3Schools "Java BufferedWriter" page (Astra wiki-curation, P-Reinforce v3.1 format).

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