2nd/10_Wiki/Topic_Programming/Topic_CSharp/CSharp_Classes_Multi.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
csharp-classes-multi	C# Multiple Classes and Objects	Programming_Language	draft	conceptual		multiple objects same class C# separate files classes C# C# 다중 클래스		B	0.82	2026-07-04	2026-07-04			csharp programming-language w3schools oop classes	https://www.w3schools.com/cs/cs_classes_multi.php

CSharp Multiple Classes and Objects

🎯 한 줄 통찰 (One-line insight)

This short chapter is largely a distilled repeat of patterns already shown in Class Members (multiple objects of one class, splitting fields/methods into one class and Main() into another) — its only genuinely new emphasis is calling out the public keyword by its formal name, "access modifier," and stating outright that without it, a field defined in one class (Car) would NOT be reachable from another class (Program), making the two-file prog2.cs/prog.cs split only work BECAUSE of that modifier. [S1]

🧠 핵심 개념 (Core concepts)

• Multiple objects of one class — Car myObj1 = new Car(); Car myObj2 = new Car(); — each is an independent instance. [S1]
• Splitting classes across files — one class (fields/methods) in one file (prog2.cs), another class (with Main()) in a separate file (prog.cs) — recommended for organization. [S1]
• public = access modifier — explicitly named as such here; it's what makes a field defined in Car reachable from the unrelated Program class. Without public, cross-class access would fail. [S1]

📖 세부 내용 (Details)

• Two objects, same class: class Car { string color = "red"; static void Main(string[] args) { Car myObj1 = new Car(); Car myObj2 = new Car(); Console.WriteLine(myObj1.color); Console.WriteLine(myObj2.color); } }. [S1]
• Cross-file class + access: prog2.cs: class Car { public string color = "red"; }; prog.cs: class Program { static void Main(string[] args) { Car myObj = new Car(); Console.WriteLine(myObj.color); } }. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

• public이 "접근 제한자(access modifier)"라는 공식 용어로 명명됨: Class Members 챕터에서는 public을 별도 이름 없이 사용했지만, 이번 챕터는 이를 명시적으로 "access modifier"라고 부르며 이것이 없으면 다른 클래스에서 필드에 접근할 수 없다는 점을 재확인함. [S1]

🛠️ 적용 사례 (Applied in summary)

동일한 Car 클래스로 두 개의 독립된 객체를 만드는 예제와, Car와 Program을 서로 다른 파일로 분리하되 public으로 필드를 노출하는 예제가 원문에서 직접 실전 활용 사례로 제시됨. [S1]

💻 코드 패턴 (Code patterns)

Cross-class field access requires public (the access modifier) (C#):

// prog2.cs
class Car
{
    public string color = "red";  // public required for cross-class access
}

// prog.cs
class Program
{
    static void Main(string[] args)
    {
        Car myObj = new Car();
        Console.WriteLine(myObj.color);
    }
}

✅ 검증 상태 및 신뢰도

• 상태: draft
• 검증 단계: conceptual
• 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
• 신뢰 점수: 0.82
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: C# Tutorial
• 관련 개념: CSharp Class Members, CSharp Constructors, CSharp Access Modifiers
• 참조 맥락: OOP Basics 섹션의 마지막 챕터 — Constructors 섹션으로 이어짐.

📚 출처 (Sources)

• [S1] W3Schools — C# Multiple Classes and Objects — https://www.w3schools.com/cs/cs_classes_multi.php

📝 변경 이력 (Change history)

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