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_Files_Read.md

@@ -0,0 +1,76 @@
+---
+id: java-files-read
+title: "Java Files Read"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["자바 파일 읽기"]
+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", "files", "io", "read", "scanner"]
+raw_sources: ["https://www.w3schools.com/java/java_files_read.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Java Files Read]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Reading a file reuses the SAME `Scanner` class already learned for user input — just constructed from a `File` object instead of `System.in` — meaning the `hasNextLine()`/`nextLine()` looping pattern from console input transfers directly to file reading with no new API to learn. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`Scanner(File)`** — the same Scanner class from user-input chapters, now constructed from a File object. [S1]
+- **Line-by-line loop** — `while (myReader.hasNextLine()) { String data = myReader.nextLine(); ... }`. [S1]
+- **`FileNotFoundException`** — must be caught since the Scanner constructor can fail if the file doesn't exist. [S1]
+- **try-with-resources** — Scanner auto-closes when used inside `try (...)`. [S1]
+- **File metadata methods** — `exists()`, `getName()`, `getAbsolutePath()`, `canWrite()`, `canRead()`, `length()`. [S1]
+- **Alternative read classes** — Scanner (simple text/parsing), BufferedReader (faster, line-by-line for large files), FileInputStream (binary data/raw bytes). [S1]
+
+## 📖 세부 내용 (Details)
+- Reading line by line: `File myObj = new File("filename.txt"); try (Scanner myReader = new Scanner(myObj)) { while (myReader.hasNextLine()) { String data = myReader.nextLine(); System.out.println(data); } } catch (FileNotFoundException e) { System.out.println("An error occurred."); }`. [S1]
+- Get file info: `if (myObj.exists()) { System.out.println("File name: " + myObj.getName()); System.out.println("Absolute path: " + myObj.getAbsolutePath()); System.out.println("Writeable: " + myObj.canWrite()); System.out.println("Readable " + myObj.canRead()); System.out.println("File size in bytes " + myObj.length()); }`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 앞서 작성한 filename.txt 내용을 다시 읽어 검증하는 흐름이 Create→Write→Read 챕터 연쇄의 실전 사례다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Reading a file line by line with Scanner (Java):
+```java
+File myObj = new File("filename.txt");
+try (Scanner myReader = new Scanner(myObj)) {
+    while (myReader.hasNextLine()) {
+        String data = myReader.nextLine();
+        System.out.println(data);
+    }
+} catch (FileNotFoundException e) {
+    System.out.println("An error occurred.");
+    e.printStackTrace();
+}
+```
+
+## ✅ 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 Files Write]], [[Java Files Delete]], [[Java User Input]], [[Java BufferedReader]], [[Java FileInputStream]]
+- **참조 맥락:** Scanner 재사용으로 파일 읽기 — Delete 챕터로 이어지며 BufferedReader/FileInputStream은 후속 심화.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Java Read Files — https://www.w3schools.com/java/java_files_read.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Java Read Files" page (Astra wiki-curation, P-Reinforce v3.1 format).