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id title category status verification_status canonical_id aliases duplicate_of source_trust_level confidence_score created_at updated_at review_reason merge_history tags raw_sources applied_in github_commit
java-identifiers Java Identifiers Programming_Language draft conceptual
자바 식별자
B 0.9 2026-07-04 2026-07-04
java
programming
w3schools
identifiers
naming
https://www.w3schools.com/java/java_variables_identifiers.asp

Java Identifiers

🎯 한 줄 통찰 (One-line insight)

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]

🧠 핵심 개념 (Core concepts)

  • Identifier — the unique name for a variable. [S1]
  • Naming rules — letters, digits, underscores, $ allowed; must begin with a letter (or $/_); no whitespace; case-sensitive; cannot be a reserved keyword. [S1]
  • Convention — start with lowercase; descriptive names recommended for readability. [S1]
  • Invalid examples2ndNumber (starts with digit), my var (contains space), int (reserved keyword used as name). [S1]

📖 세부 내용 (Details)

  • Good vs. terse naming: int minutesPerHour = 60; (clear) vs. int m = 60; (works, less clear). [S1]
  • Invalid identifiers: int 2ndNumber = 5;, int my var = 10;, int int = 20; — all raise errors. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — Python Variable Names 챕터와 동일한 규칙 구조(문자/숫자 시작 제약, 대소문자 구분, 예약어 금지)를 공유한다. [S1]

💻 코드 패턴 (Code patterns)

Descriptive vs. terse naming (Java):

int minutesPerHour = 60;  // Good: clear intent
int m = 60;               // OK, but less clear

검증 상태 및 신뢰도

  • 상태: draft
  • 검증 단계: conceptual
  • 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
  • 신뢰 점수: 0.90
  • 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

📚 출처 (Sources)

📝 변경 이력 (Change history)

  • 2026-07-04: Initial draft synthesized from the W3Schools "Java Identifiers" page (Astra wiki-curation, P-Reinforce v3.1 format).