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74 lines
3.3 KiB
Markdown
74 lines
3.3 KiB
Markdown
---
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id: java-scope
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title: "Java Scope"
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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 변수 범위"]
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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", "scope"]
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raw_sources: ["https://www.w3schools.com/java/java_scope.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[Java Scope]]
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## 🎯 한 줄 통찰 (One-line insight)
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A loop's counter variable dies when the loop ends, which means the same name (`i`, `j`) can be safely reused across separate loops in the same method — scope isn't just a restriction, it's what enables variable-name reuse without conflict. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Scope** — the region where a variable is accessible; Java variables live only inside the region where they're created. [S1]
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- **Method scope** — a variable is usable anywhere in the method AFTER its declaration line, not before. [S1]
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- **Block scope** — `{ }` delimits a block; a variable declared inside is accessible only within that block, and only after its declaration line. [S1]
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- **Loop scope** — a variable declared in a for-loop header exists only inside that loop; it's destroyed once the loop ends. [S1]
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- **Name reuse across loops** — since each loop's `i` is destroyed at loop end, separate loops in the same method can reuse the same variable name. [S1]
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## 📖 세부 내용 (Details)
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- Method scope: `int x = 100;` declared mid-method is unusable before its declaration line, usable after. [S1]
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- Block scope: a variable declared inside `{ }` is inaccessible both before the block and after it ends. [S1]
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- Loop scope: `for (int i = 0; i < 5; i++) { System.out.println(i); } // i is NOT accessible here`. [S1]
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- Reused loop variable names: two separate `for (int i = 0; ...)` loops in the same method, each with their own independent `i`. [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 반복문에서 동일한 변수명(i, j)을 안전하게 재사용할 수 있는 근거가 스코프 규칙이다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Safe reuse of loop variable name across separate loops (Java):
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```java
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for (int i = 0; i < 3; i++) {
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System.out.println("Loop 1: " + i);
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}
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for (int i = 0; i < 2; i++) {
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System.out.println("Loop 2: " + i);
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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:** 0.90
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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 For Loop]], [[Java Methods]], [[Java Recursion]]
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- **참조 맥락:** 변수 접근 범위 규칙 — 메서드/블록/반복문 스코프의 차이.
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## 📚 출처 (Sources)
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- [S1] W3Schools — Java Scope — https://www.w3schools.com/java/java_scope.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "Java Scope" page (Astra wiki-curation, P-Reinforce v3.1 format).
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