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_FileOutputStream.md

@@ -0,0 +1,74 @@
+---
+id: java-fileoutputstream
+title: "Java FileOutputStream"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["자바 FileOutputStream"]
+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", "fileoutputstream", "byte-stream"]
+raw_sources: ["https://www.w3schools.com/java/java_fileoutputstream.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Java FileOutputStream]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+`FileOutputStream` mirrors `FileWriter`'s API surface almost exactly (`.write()`, overwrite-by-default, `true` as second constructor arg for append) — the only real difference is that it writes raw bytes (`text.getBytes()`) instead of character text, which is what makes it usable for binary files where FileWriter cannot go. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`FileOutputStream`** — writes raw bytes; works for both text and binary data (images, PDFs, audio). [S1]
+- **`.write(text.getBytes())`** — converts a String to bytes before writing. [S1]
+- **Default overwrite behavior** — same as FileWriter: replaces existing file content. [S1]
+- **Append mode** — pass `true` as the second constructor argument: `new FileOutputStream("filename.txt", true)`. [S1]
+- **Byte-level file copying** — pairs with `FileInputStream` to copy any file type. [S1]
+
+## 📖 세부 내용 (Details)
+- Basic text write: `try (FileOutputStream output = new FileOutputStream("filename.txt")) { output.write(text.getBytes()); }`. [S1]
+- Binary file copy: `try (FileInputStream input = new FileInputStream("image.jpg"); FileOutputStream output = new FileOutputStream("copy.jpg")) { int b; while ((b = input.read()) != -1) { output.write(b); } }`. [S1]
+- Append mode: `try (FileOutputStream output = new FileOutputStream("filename.txt", true)) { output.write(text.getBytes()); }`. [S1]
+- Class choice guide: FileWriter (basic text), BufferedWriter (large text, line handling), FileOutputStream (binary/raw byte control). [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — FileInputStream과 짝을 이룬 이미지 파일 복사가 대표적 실전 응용이다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Append mode with FileOutputStream (Java):
+```java
+String text = "\nAppended text!";
+try (FileOutputStream output = new FileOutputStream("filename.txt", true)) { // true = append
+    output.write(text.getBytes());
+    System.out.println("Successfully appended to 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 FileInputStream]], [[Java Files Write]], [[Java BufferedWriter]]
+- **참조 맥락:** 바이트 단위 파일 쓰기 — FileInputStream과 짝을 이루어 파일 복사에 사용.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Java FileOutputStream — https://www.w3schools.com/java/java_fileoutputstream.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Java FileOutputStream" page (Astra wiki-curation, P-Reinforce v3.1 format).