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74 lines
3.5 KiB
Markdown
74 lines
3.5 KiB
Markdown
---
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id: java-bufferedwriter
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title: "Java BufferedWriter"
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category: "Programming_Language"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["자바 BufferedWriter"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.88
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created_at: 2026-07-04
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updated_at: 2026-07-04
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review_reason: ""
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merge_history: []
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tags: ["java", "programming", "w3schools", "io", "bufferedwriter", "character-stream"]
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raw_sources: ["https://www.w3schools.com/java/java_bufferedwriter.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[Java BufferedWriter]]
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## 🎯 한 줄 통찰 (One-line insight)
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`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]
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## 🧠 핵심 개념 (Core concepts)
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- **`BufferedWriter`** — writes text line/string at a time; must be paired with `FileWriter` (which opens/creates the file). [S1]
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- **`.newLine()`** — inserts a line break, an alternative to embedding `\n` manually. [S1]
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- **Default overwrite** — like FileWriter, replaces existing file content unless append mode is used. [S1]
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- **Append mode** — pass `true` to the underlying `FileWriter` constructor: `new FileWriter("filename.txt", true)`. [S1]
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## 📖 세부 내용 (Details)
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- 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]
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- Append mode: `try (BufferedWriter bw = new BufferedWriter(new FileWriter("filename.txt", true))) { bw.newLine(); bw.write("Appended line"); }`. [S1]
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- Class comparison: FileWriter (simple/quick), BufferedWriter (faster for large files, easy newLine()), FileOutputStream (binary files). [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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소스에서 모순되는 정보는 발견되지 않음.
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — 여러 줄의 텍스트를 newLine()으로 구분하며 파일에 쓰는 표준 패턴이다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Writing multiple lines with newLine() (Java):
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```java
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try (BufferedWriter bw = new BufferedWriter(new FileWriter("filename.txt"))) {
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bw.write("First line");
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bw.newLine(); // add line break
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bw.write("Second line");
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System.out.println("Successfully wrote to the file.");
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} catch (IOException e) {
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System.out.println("Error writing file.");
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}
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```
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.88
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[Java Tutorial]]
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- **관련 개념:** [[Java BufferedReader]], [[Java FileOutputStream]], [[Java Files Write]]
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- **참조 맥락:** 버퍼링을 통한 빠른 텍스트 쓰기 — Data Structures & Collections 섹션으로 이어짐.
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## 📚 출처 (Sources)
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- [S1] W3Schools — Java BufferedWriter — https://www.w3schools.com/java/java_bufferedwriter.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "Java BufferedWriter" page (Astra wiki-curation, P-Reinforce v3.1 format).
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