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2nd/10_Wiki/Topics/Domain_Programming/Topic_Java/Java_Packages.md
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Antigravity Agent c24165b8bc refactor(topics): 멀티 에이전트용 지식 재편 — _Common(공통 기본기) + Domain_* 구조
에이전트 8종(대화형/프로그래머 C·S/디자이너/설계자/기획자/QA/PD/PM)에게
[공통 기본 능력 + 롤별 Specialty] 2층으로 지식을 주입하기 위한 재분류.
문서 내용·포맷은 무수정, 폴더 이동만 (6,372개 문서 수 보존 확인).

- Topic_Programming → Domain_Programming (내부 구조 보존)
- Topic_Graphic → Domain_Design
- Topic_Business → Domain_Product
- Topic_General → Domain_General
- _Common 신설: Math(구 Topic_Math_Specialty), Reasoning(구 General/From_Thinking & Reasoning),
  Reasoning_Creativity(구 General/From_창의성), Communication(Poetic_Blog_Writing + From_writing)
- 타 도메인의 From_* 폴더는 유지 (출처 표기일 뿐, 이미 도메인에 맞게 분류된 문서)
- 빈 폴더 정리 (memory/procedures)
- 에이전트→폴더 매핑은 workspace의 .astra/agent-knowledge-map.json (9개 에이전트)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-11 11:05:56 +09:00

3.6 KiB

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
java-packages Java Packages Programming_Language draft conceptual
import keyword
자바 패키지
B 0.88 2026-07-04 2026-07-04
java
programming
w3schools
oop
packages
import
https://www.w3schools.com/java/java_packages.asp

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]
  • importimport 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):

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)

📚 출처 (Sources)

📝 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).