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title

Java Class Attributes

🎯 한 줄 통찰 (One-line insight)

Attributes on separate object instances are fully independent — changing myObj2.x to 25 leaves myObj1.x at its original 5, demonstrating that each object carries its own copy of non-static attribute state rather than sharing it. [S1]

🧠 핵심 개념 (Core concepts)

Attribute — a variable declared inside a class; also called a "field". [S1]
Dot syntax access — myObj.x reads or writes an attribute via an object reference. [S1]
Mutation vs. override — assigning a new value to an uninitialized field vs. changing an already-initialized field, functionally the same mechanism. [S1]
final — prevents overriding an attribute's value after initialization; introduced here as a preview of the Modifiers chapter. [S1]
Per-object independence — each object's attributes are separate; modifying one instance doesn't affect another. [S1]

📖 세부 내용 (Details)

Access: Main myObj = new Main(); System.out.println(myObj.x);. [S1]
Modify: myObj.x = 40;. [S1]
Final (immutable) attribute: final int x = 10; ... myObj.x = 25; // Error: cannot assign a value to a final variable. [S1]
Independent instances: myObj2.x = 25; System.out.println(myObj1.x); // 5 (unchanged) System.out.println(myObj2.x); // 25. [S1]
Multiple attributes: String fname = "John"; String lname = "Doe"; int age = 24;. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — final 키워드로 PI(3.14159...)처럼 불변 상수를 표현하는 예시가 실전 적용의 대표 사례다. [S1]

💻 코드 패턴 (Code patterns)

Independent attribute state across objects (Java):

Main myObj1 = new Main(); // Object 1
Main myObj2 = new Main(); // Object 2
myObj2.x = 25;
System.out.println(myObj1.x); // Outputs 5
System.out.println(myObj2.x); // Outputs 25

✅ 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 Classes, Java Class Methods, Java Modifiers, Java Constants Final
참조 맥락: 클래스 변수(필드)의 접근/수정 — final 키워드는 Modifiers 챕터에서 심화.

📚 출처 (Sources)

[S1] W3Schools — Java Class Attributes — https://www.w3schools.com/java/java_class_attributes.asp

📝 변경 이력 (Change history)

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

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