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75 lines
3.2 KiB
Markdown
75 lines
3.2 KiB
Markdown
---
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id: java-syntax
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title: "Java Syntax"
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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: ["main method", "자바 문법"]
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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", "syntax", "main-method"]
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raw_sources: ["https://www.w3schools.com/java/java_syntax.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[Java Syntax]]
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## 🎯 한 줄 통찰 (One-line insight)
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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]
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## 🧠 핵심 개념 (Core concepts)
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- **Every line of runnable code lives inside a class** — class names conventionally start with an uppercase letter. [S1]
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- **Case-sensitive** — `MyClass` and `myclass` are different names. [S1]
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- **Filename must match the class name** — `class Main` must be saved as `Main.java`. [S1]
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- **`main()` method** — required in every Java program; the entry point where execution starts. [S1]
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- **`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]
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- **Semicolons required** — every statement must end with `;`. [S1]
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- **Curly braces `{}`** — mark the start/end of a code block. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **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]
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## 📖 세부 내용 (Details)
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- Basic structure: `public class Main { public static void main(String[] args) { System.out.println("Hello World"); } }`, saved as `Main.java`. [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 — public/static/void 키워드는 이후 OOP 챕터(Modifiers)에서 상세히 다뤄진다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Minimal Java program structure (Java, file: Main.java):
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```java
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public class Main {
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public static void main(String[] args) {
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System.out.println("Hello World");
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}
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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 Intro]], [[Java Statements]], [[Java Modifiers]]
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- **참조 맥락:** Java 프로그램의 기본 골격 — public/static/void는 이후 Modifiers 챕터로 이어진다.
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## 📚 출처 (Sources)
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- [S1] W3Schools — Java Syntax — https://www.w3schools.com/java/java_syntax.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "Java Syntax" page (Astra wiki-curation, P-Reinforce v3.1 format).
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