2nd/10_Wiki/Topics/Domain_Programming/Topic_Java/Java_Classes.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-classes	Java Classes	Programming_Language	draft	conceptual		classes and objects 자바 클래스		B	0.9	2026-07-04	2026-07-04			java programming w3schools oop classes	https://www.w3schools.com/java/java_classes.asp

Java Classes

🎯 한 줄 통찰 (One-line insight)

Java enforces a strict class-filename match (Main must live in Main.java), which becomes essential once splitting code across multiple classes/files — the multi-class example explicitly shows Main.java holding the data class while Second.java holds the class with main(). [S1]

🧠 핵심 개념 (Core concepts)

• Class — an object constructor/"blueprint" for creating objects. [S1]
• class keyword — declares a class; name should start uppercase and match the filename. [S1]
• new keyword — creates an object instance from a class: Main myObj = new Main();. [S1]
• Multiple objects — each independent instance of the same class. [S1]
• Multiple classes/files — one class can hold attributes/methods, another can hold main() — common organizational pattern. [S1]

📖 세부 내용 (Details)

• Class definition: public class Main { int x = 5; }. [S1]
• Object creation and access: Main myObj = new Main(); System.out.println(myObj.x); // 5. [S1]
• Multiple objects: Main myObj1 = new Main(); Main myObj2 = new Main(); — each independently prints x = 5. [S1]
• Multi-file pattern: Main.java defines class Main { int x = 5; }; Second.java defines class Second { public static void main(...) { Main myObj = new Main(); System.out.println(myObj.x); } }; compiled/run via javac Main.java, javac Second.java, java Second. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 클래스와 main() 실행 로직을 별도 파일로 분리하는 구조가 이후 OOP 전반의 표준 패턴이다. [S1]

💻 코드 패턴 (Code patterns)

Multiple independent objects (Java):

public class Main {
    int x = 5;
    public static void main(String[] args) {
        Main myObj1 = new Main(); // Object 1
        Main myObj2 = new Main(); // Object 2
        System.out.println(myObj1.x);
        System.out.println(myObj2.x);
    }
}

✅ 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 OOP, Java Class Attributes, Java Class Methods, Java Constructors
• 참조 맥락: 클래스 선언/객체 생성의 기초 문법 — 속성/메서드 챕터로 확장.

📚 출처 (Sources)

• [S1] W3Schools — Java Classes and Objects — https://www.w3schools.com/java/java_classes.asp

📝 변경 이력 (Change history)

• 2026-07-04: Initial draft synthesized from the W3Schools "Java Classes/Objects" page (Astra wiki-curation, P-Reinforce v3.1 format).