docs(10_Wiki): Topic_Business/General/Graphic/Programming을 Topics/ 하위로 이동

최상위 10_Wiki/Topic_*였던 4개 카테고리 폴더를 10_Wiki/Topics/Topic_* 로 재배치. 콘텐츠 변경 없음(순수 폴더 이동) — Topics/ 하위 나머지 폴더는 이미 지난 커밋에서 전부 정리된 상태(잔존 항목은 에이전트 운영 상태 및 사용자가 보존을 요청한 업데이트0615/무제 3.canvas 뿐).
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+---
+id: java-packages
+title: "Java Packages"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["import keyword", "자바 패키지"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.88
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["java", "programming", "w3schools", "oop", "packages", "import"]
+raw_sources: ["https://www.w3schools.com/java/java_packages.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Java Packages]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Building your own package requires a two-step compile that most beginners miss — first `javac MyPackageClass.java`, then `javac -d . MyPackageClass.java` (the `-d` flag actually creates the package's folder structure); skipping the second step means the package folder never materializes. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Package** — groups related classes, like a folder; avoids name conflicts, improves maintainability. [S1]
+- **Built-in packages** — the Java API, a library of prewritten classes (e.g. `java.util`). [S1]
+- **User-defined packages** — created via the `package` keyword, mapped to actual filesystem directories. [S1]
+- **`import`** — `import package.name.Class;` for a single class, `import package.name.*;` for the whole package. [S1]
+- **`-d` compiler flag** — specifies the destination folder, forcing the compiler to create the package directory structure. [S1]
+- **Lowercase package naming convention** — avoids conflicts with class names (which start uppercase). [S1]
+
+## 📖 세부 내용 (Details)
+- Import a single class: `import java.util.Scanner; ... Scanner myObj = new Scanner(System.in); String userName = myObj.nextLine();`. [S1]
+- Import whole package: `import java.util.*;`. [S1]
+- User-defined package: `package mypack; class MyPackageClass { public static void main(String[] args) { System.out.println("This is my package!"); } }`. [S1]
+- Compile + run: `javac MyPackageClass.java` then `javac -d . MyPackageClass.java`, then run via `java mypack.MyPackageClass`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — Scanner 클래스를 이용한 사용자 입력 처리가 java.util 패키지 활용의 대표 실전 사례다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Using Scanner from java.util for user input (Java):
+```java
+import java.util.Scanner;
+class Main {
+    public static void main(String[] args) {
+        Scanner myObj = new Scanner(System.in);
+        System.out.println("Enter username");
+        String userName = myObj.nextLine();
+        System.out.println("Username is: " + userName);
+    }
+}
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
+- **신뢰 점수:** 0.88
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[Java Tutorial]]
+- **관련 개념:** [[Java Encapsulation]], [[Java Inheritance]], [[Java User Input]]
+- **참조 맥락:** 클래스 그룹화 및 import 문법 — 사용자 입력(Scanner)/상속 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Java Packages & API — https://www.w3schools.com/java/java_packages.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Java Packages & API" page (Astra wiki-curation, P-Reinforce v3.1 format).