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10_Wiki/Topics/Topic_Programming/Topic_Java/Java_Syntax.md

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+---
+id: java-syntax
+title: "Java Syntax"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["main method", "자바 문법"]
+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", "syntax", "main-method"]
+raw_sources: ["https://www.w3schools.com/java/java_syntax.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Java Syntax]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The filename MUST exactly match the public class name (`Main` → `Main.java`), because Java uses the class name to locate and run the code — a mismatch is a hard error, not a warning. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Every line of runnable code lives inside a class** — class names conventionally start with an uppercase letter. [S1]
+- **Case-sensitive** — `MyClass` and `myclass` are different names. [S1]
+- **Filename must match the class name** — `class Main` must be saved as `Main.java`. [S1]
+- **`main()` method** — required in every Java program; the entry point where execution starts. [S1]
+- **`System.out.println()`** — prints a line of text; `System` is a built-in class, `out` is its output member, `println()` is the print-line method. [S1]
+- **Semicolons required** — every statement must end with `;`. [S1]
+- **Curly braces `{}`** — mark the start/end of a code block. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Filename-class binding is unusually strict** — unlike many languages where filenames are just organizational, Java enforces filename == public class name as a hard requirement for compilation to succeed. [S1]
+
+## 📖 세부 내용 (Details)
+- Basic structure: `public class Main { public static void main(String[] args) { System.out.println("Hello World"); } }`, saved as `Main.java`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — public/static/void 키워드는 이후 OOP 챕터(Modifiers)에서 상세히 다뤄진다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Minimal Java program structure (Java, file: Main.java):
+```java
+public class Main {
+    public static void main(String[] args) {
+        System.out.println("Hello World");
+    }
+}
+```
+
+## ✅ 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 Intro]], [[Java Statements]], [[Java Modifiers]]
+- **참조 맥락:** Java 프로그램의 기본 골격 — public/static/void는 이후 Modifiers 챕터로 이어진다.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Java Syntax — https://www.w3schools.com/java/java_syntax.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Java Syntax" page (Astra wiki-curation, P-Reinforce v3.1 format).