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10_Wiki/Dev/Topic_Java/Java_For_Loop.md

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+---
+id: java-for-loop
+title: "Java For Loop"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["for loop", "자바 for 반복문"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.9
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["java", "programming", "w3schools", "loops", "for"]
+raw_sources: ["https://www.w3schools.com/java/java_for_loop.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Java For Loop]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Choose `for` over `while` specifically when the iteration count is known in advance — the tutorial frames this as the deciding factor between the two loop types, since a for loop bundles init/condition/increment into one line while while requires manual setup outside the loop. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`for (statement1; statement2; statement3) { ... }`** — statement1 runs once before the loop, statement2 is the continuation condition, statement3 runs after each iteration. [S1]
+- **When to use for vs while** — for loop is preferred when the exact iteration count is known ahead of time. [S1]
+- **False condition from the start** — like while, a for loop with a false initial condition skips the body entirely. [S1]
+
+## 📖 세부 내용 (Details)
+- Print 0-4: `for (int i = 0; i < 5; i++) { System.out.println(i); }`. [S1]
+- Even numbers: `for (int i = 0; i <= 10; i = i + 2) { System.out.println(i); }`. [S1]
+- Sum 1-5: `int sum = 0; for (int i = 1; i <= 5; i++) { sum = sum + i; } System.out.println("Sum is " + sum);`. [S1]
+- Countdown: `for (int i = 5; i > 0; i--) { System.out.println(i); }`. [S1]
+- Never runs: `for (int i = 10; i < 5; i++) { System.out.println("This will never be printed"); }`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 합계 계산, 카운트다운 등 반복 횟수를 미리 아는 상황의 표준 도구다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Sum accumulation with for loop (Java):
+```java
+int sum = 0;
+for (int i = 1; i <= 5; i++) {
+    sum = sum + i;
+}
+System.out.println("Sum is " + sum);
+```
+
+## ✅ 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)
+- **상위/루트:** [[Java Tutorial]]
+- **관련 개념:** [[Java While Loop]], [[Java For Loop Nested]], [[Java For Each Loop]], [[Java For Loop Real Life]]
+- **참조 맥락:** 반복 횟수를 아는 경우의 표준 반복문 — 중첩/for-each로 확장됨.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Java For Loop — https://www.w3schools.com/java/java_for_loop.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Java For Loop" page (Astra wiki-curation, P-Reinforce v3.1 format).