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10_Wiki/Dev/Topic_Java/Java_Else_If.md

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+---
+id: java-else-if
+title: "Java Else If"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["else if statement", "자바 else if"]
+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", "conditions", "else-if"]
+raw_sources: ["https://www.w3schools.com/java/java_conditions_elseif.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Java Else If]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+An `else if` chain short-circuits at the first true condition — later conditions are never even evaluated, so ordering matters (e.g., a `time < 18` check placed before a `time < 12` check would incorrectly swallow morning cases). [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`else if`** — tests a new condition only if the preceding if/else-if was false. [S1]
+- **Syntax** — `if (condition1) {...} else if (condition2) {...} else {...}`. [S1]
+- **Chain evaluation** — conditions are checked top-to-bottom; the first true one wins and the rest are skipped. [S1]
+
+## 📖 세부 내용 (Details)
+- Weather example: `int weather = 2; if (weather == 1) {...} else if (weather == 2) { System.out.println("Wear sunglasses."); } else {...} // Outputs "Wear sunglasses."`. [S1]
+- Time-of-day chain: `int time = 16; if (time < 12) {...} else if (time < 18) { System.out.println("Good day."); } else {...} // Outputs "Good day."`. [S1]
+- Falls through to final else: `int time = 22;` with the same chain outputs `"Good evening."` since neither earlier condition matches. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 셋 이상의 분기가 필요한 다중 조건 판단(시간대, 온도, 등급 등)의 표준 패턴이다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Three-way branch chain (Java):
+```java
+int time = 16;
+if (time < 12) {
+    System.out.println("Good morning.");
+} else if (time < 18) {
+    System.out.println("Good day.");
+} else {
+    System.out.println("Good evening.");
+}
+```
+
+## ✅ 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 Else]], [[Java If Shorthand]], [[Java Switch]]
+- **참조 맥락:** 다중 조건 분기 — switch문의 대안으로 쓰임.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Java Else If — https://www.w3schools.com/java/java_conditions_elseif.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Java Else If" page (Astra wiki-curation, P-Reinforce v3.1 format).