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title

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):

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).

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