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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)

📚 출처 (Sources)

📝 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).