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

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  Subsystems, 77개)는 이미 Topic_Programming/Topic_Programming에 더 최신 버전이
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  JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동.
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- Topic_Programming 최종 문서 수: 2784 → 3985.

10_Wiki/Topic_Programming/Topic_Java/Java_BufferedWriter.md

@@ -0,0 +1,73 @@
+---
+id: java-bufferedwriter
+title: "Java BufferedWriter"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["자바 BufferedWriter"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.88
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["java", "programming", "w3schools", "io", "bufferedwriter", "character-stream"]
+raw_sources: ["https://www.w3schools.com/java/java_bufferedwriter.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[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):
+```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).