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10_Wiki/Dev/Topic_CSharp/CSharp_Classes_Multi.md

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+---
+id: csharp-classes-multi
+title: "C# Multiple Classes and Objects"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["multiple objects same class C#", "separate files classes C#", "C# 다중 클래스"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.82
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["csharp", "programming-language", "w3schools", "oop", "classes"]
+raw_sources: ["https://www.w3schools.com/cs/cs_classes_multi.php"]
+applied_in: []
+github_commit: ""
+---
+
+# [[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#):
+```csharp
+// 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).