2nd/10_Wiki/Topics/Domain_Programming/Topic_Java/Java_Syntax.md

id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit

id	title	category	status	verification_status	canonical_id	aliases	duplicate_of	source_trust_level	confidence_score	created_at	updated_at	review_reason	merge_history	tags	raw_sources	applied_in	github_commit
java-syntax	Java Syntax	Programming_Language	draft	conceptual		main method 자바 문법		B	0.9	2026-07-04	2026-07-04			java programming w3schools syntax main-method	https://www.w3schools.com/java/java_syntax.asp

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).