---
id: java-modifiers
title: "Java Modifiers"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["access modifiers", "자바 접근 제어자"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.9
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["java", "programming", "w3schools", "oop", "modifiers", "access-control"]
raw_sources: ["https://www.w3schools.com/java/java_modifiers.asp"]
applied_in: []
github_commit: ""
---

# [[Java Modifiers]]

## 🎯 한 줄 통찰 (One-line insight)
Classes only get two access modifier choices (`public`/default), while attributes/methods/constructors get four (`public`/`private`/default/`protected`) — the extra granularity for members exists because access control needs to operate at a finer level than whole-class visibility. [S1]

## 🧠 핵심 개념 (Core concepts)
- **Access modifier** — controls the access level of classes, attributes, methods, constructors. [S1]
- **For classes** — `public` (accessible by any class) or `default` (package-only, used when no modifier is specified). [S1]
- **For members (attributes/methods/constructors)** — `public`, `private` (class-only), `default` (package-only), `protected` (package + subclasses). [S1]
- **Real-life analogy** — public = public park (anyone enters); private = house key (only you). [S1]

## 📖 세부 내용 (Details)
- Public vs. private: `class Person { public String name = "John"; private int age = 30; } ... p.name // works; p.age // Error: age has private access in Person`. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
소스에서 모순되는 정보는 발견되지 않음.

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — public/private 분리는 캡슐화(Encapsulation) 챕터의 직접적 기반이다. [S1]

## 💻 코드 패턴 (Code patterns)
Public vs. private attribute access (Java):
```java
class Person {
    public String name = "John"; // accessible everywhere
    private int age = 30;        // only accessible inside this class
}
```

## ✅ 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 Non Access Modifiers]], [[Java Encapsulation]], [[Java Packages]], [[Java Inheritance]]
- **참조 맥락:** 접근 제어자의 기초 — 캡슐화/패키지/상속 챕터로 확장.

## 📚 출처 (Sources)
- [S1] W3Schools — Java Modifiers — https://www.w3schools.com/java/java_modifiers.asp

## 📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "Java Modifiers" page (Astra wiki-curation, P-Reinforce v3.1 format).