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10_Wiki/Dev/Topic_Java/Java_BufferedReader.md

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+---
+id: java-bufferedreader
+title: "Java BufferedReader"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["자바 BufferedReader"]
+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", "bufferedreader", "character-stream"]
+raw_sources: ["https://www.w3schools.com/java/java_bufferedreader.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Java BufferedReader]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+`BufferedReader` never opens files directly — it always wraps a `FileReader`, which handles the actual file-opening while BufferedReader adds a memory buffer on top to make line-by-line reading (`readLine()`) fast for large files, a decorator-pattern relationship rather than a standalone class. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`BufferedReader`** — reads text line-by-line via `readLine()`; must be paired with `FileReader` (which opens the file). [S1]
+- **`readLine()`** — returns `null` at end-of-file, used as the loop termination condition. [S1]
+- **Buffer for speed** — the class uses an internal memory buffer to make reading faster than unbuffered access. [S1]
+- **Best use case** — large text files, since it's faster and uses less memory than Scanner. [S1]
+
+## 📖 세부 내용 (Details)
+- Line-by-line read: `try (BufferedReader br = new BufferedReader(new FileReader("filename.txt"))) { String line; while ((line = br.readLine()) != null) { System.out.println(line); } } catch (IOException e) {...}`. [S1]
+- Class comparison: Scanner (simple text, split into lines/words/numbers), BufferedReader (large text files, faster, less memory, readLine()), FileInputStream (binary files). [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 대용량 텍스트 파일을 빠르게 한 줄씩 읽는 표준 패턴이다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Reading a file line by line with BufferedReader (Java):
+```java
+try (BufferedReader br = new BufferedReader(new FileReader("filename.txt"))) {
+    String line;
+    while ((line = br.readLine()) != null) {
+        System.out.println(line);
+    }
+} catch (IOException e) {
+    System.out.println("Error reading 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 BufferedWriter]], [[Java Files Read]]
+- **참조 맥락:** 버퍼링을 통한 빠른 텍스트 읽기 — BufferedWriter와 대칭되는 쓰기 클래스.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Java BufferedReader — https://www.w3schools.com/java/java_bufferedreader.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Java BufferedReader and BufferedWriter" page (Astra wiki-curation, P-Reinforce v3.1 format).