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10_Wiki/Dev/Topic_Java/Java_Var_Keyword.md

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+---
+id: java-var-keyword
+title: "Java Var Keyword"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["var (Java 10+)", "type inference", "자바 var 키워드"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.88
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["java", "programming", "w3schools", "var", "type-inference"]
+raw_sources: ["https://www.w3schools.com/java/java_var.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Java Var Keyword]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+`var` (Java 10+) is type INFERENCE, not dynamic typing — the compiler still locks in a fixed type at the moment of assignment (`var x = 5;` → permanently int), so `x = 9.99;` later still errors exactly as if you'd written `int x = 5;` explicitly. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`var`** (Java 10, 2018) — lets the compiler infer a variable's type from its assigned value. [S1]
+- **Must assign at declaration** — `var x;` alone is an error; `var x = 5;` is required. [S1]
+- **Type still locked in** — once inferred, the type cannot change, exactly like an explicit declaration. [S1]
+- **Best for complex types** — most useful for verbose generic types like `ArrayList<String>`, less useful for simple types where explicit typing is already clear. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **var is sugar, not a type system change** — it removes REPETITION (`ArrayList<String> cars = new ArrayList<String>();` → `var cars = new ArrayList<String>();`) without weakening static type safety at all. [S1]
+
+## 📖 세부 내용 (Details)
+- Basic inference: `var x = 5; // x is an int`. [S1]
+- Multiple types inferred: `var myNum = 5; var myDouble = 9.98; var myChar = 'D'; var myBoolean = true; var myString = "Hello";`. [S1]
+- Must assign immediately: `var x; // Error` vs. `var x = 5; // OK`. [S1]
+- Type stays locked: `var x = 5; x = 10; // OK; x = 9.99; // Error`. [S1]
+- Reduces verbosity for complex types: `var cars = new ArrayList<String>();` instead of `ArrayList<String> cars = new ArrayList<String>();`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — ArrayList/HashMap처럼 제네릭 타입이 장황할 때 코드 가독성을 높이는 데 쓰인다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+var reduces verbosity for generic types (Java):
+```java
+// Without var
+ArrayList<String> cars = new ArrayList<String>();
+// With var
+var cars = new ArrayList<String>();
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
+- **신뢰 점수:** 0.88
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[Java Tutorial]]
+- **관련 개념:** [[Java Variables]], [[Java ArrayList]], [[Java Data Types]]
+- **참조 맥락:** 타입 추론으로 코드 간결화 — 여전히 정적 타이핑 안전성은 유지된다.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Java var Keyword — https://www.w3schools.com/java/java_var.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Java var Keyword" page (Astra wiki-curation, P-Reinforce v3.1 format).