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67 lines
2.9 KiB
Markdown
67 lines
2.9 KiB
Markdown
---
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id: java-identifiers
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title: "Java Identifiers"
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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 식별자"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.9
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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", "identifiers", "naming"]
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raw_sources: ["https://www.w3schools.com/java/java_variables_identifiers.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[Java Identifiers]]
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## 🎯 한 줄 통찰 (One-line insight)
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A valid Java identifier must start with a letter, `$`, or `_` (never a digit), contain no spaces, avoid reserved keywords, and is case-sensitive — with descriptive names strongly favored over terse ones for maintainability. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Identifier** — the unique name for a variable. [S1]
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- **Naming rules** — letters, digits, underscores, `$` allowed; must begin with a letter (or `$`/`_`); no whitespace; case-sensitive; cannot be a reserved keyword. [S1]
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- **Convention** — start with lowercase; descriptive names recommended for readability. [S1]
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- **Invalid examples** — `2ndNumber` (starts with digit), `my var` (contains space), `int` (reserved keyword used as name). [S1]
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## 📖 세부 내용 (Details)
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- Good vs. terse naming: `int minutesPerHour = 60;` (clear) vs. `int m = 60;` (works, less clear). [S1]
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- Invalid identifiers: `int 2ndNumber = 5;`, `int my var = 10;`, `int int = 20;` — all raise errors. [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 — Python Variable Names 챕터와 동일한 규칙 구조(문자/숫자 시작 제약, 대소문자 구분, 예약어 금지)를 공유한다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Descriptive vs. terse naming (Java):
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```java
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int minutesPerHour = 60; // Good: clear intent
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int m = 60; // OK, but less clear
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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:** 0.90
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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 Variables]], [[Python Variable Names]]
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- **참조 맥락:** 변수명 작성 규칙 — Python Variable Names와 유사한 구조.
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## 📚 출처 (Sources)
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- [S1] W3Schools — Java Identifiers — https://www.w3schools.com/java/java_variables_identifiers.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "Java Identifiers" page (Astra wiki-curation, P-Reinforce v3.1 format).
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