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>
This commit is contained in:
Antigravity Agent
2026-07-11 11:05:56 +09:00
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---
id: java-numbers
title: "Java Numbers"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["byte short int long float double", "자바 숫자 타입"]
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", "numbers", "int", "double"]
raw_sources: ["https://www.w3schools.com/java/java_data_types_numbers.asp"]
applied_in: []
github_commit: ""
---
# [[Java Numbers]]
## 🎯 한 줄 통찰 (One-line insight)
`long` values need a trailing `L` and `float` values need a trailing `f` (double needs `d`, but it's optional since double is the default) — omitting these suffixes on large/decimal literals causes compile errors or silent precision loss. [S1]
## 🧠 핵심 개념 (Core concepts)
- **Integer types** — `byte`, `short`, `int` (preferred default for whole numbers), `long` (for values too large for int, requires `L` suffix). [S1]
- **Floating point types** — `float` (requires `f` suffix, 6-7 decimal digit precision), `double` (15-16 digit precision, preferred for most calculations). [S1]
- **Scientific notation** — `float f1 = 35e3f; double d1 = 12E4d;` uses `e`/`E` for powers of 10. [S1]
## 🧩 추출된 패턴 (Extracted patterns)
- **Literal suffix requirement scales with type size** — `L` for long, `f` for float, `d` for double (optional) — the suffix tells the compiler which literal type to use, since Java's default numeric literal types are `int` and `double`. [S1]
- **double as the safe default for decimals** — the tutorial explicitly recommends double over float for most calculations due to its much higher precision. [S1]
## 📖 세부 내용 (Details)
- byte: `byte myNum = 100;` (range -128 to 127). [S1]
- short: `short myNum = 5000;` (range -32768 to 32767). [S1]
- int: `int myNum = 100000;` (preferred default). [S1]
- long: `long myNum = 15000000000L;` (note the `L` suffix). [S1]
- float: `float myNum = 5.75f;`. [S1]
- double: `double myNum = 19.99d;`. [S1]
- Scientific notation: `float f1 = 35e3f; double d1 = 12E4d;`. [S1]
## ⚖️ 모순 및 업데이트 (Contradictions & updates)
소스에서 모순되는 정보는 발견되지 않음.
## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — Type Casting 챕터에서 이 숫자 타입들 간 자동/수동 변환이 다뤄진다. [S1]
## 💻 코드 패턴 (Code patterns)
Long and float literal suffixes (Java):
```java
long myNum = 15000000000L;
float myFloat = 5.75f;
double myDouble = 19.99d; // d is optional (double is the default)
```
## ✅ 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 Data Types]], [[Java Type Casting]], [[Java Math]]
- **참조 맥락:** 6개 숫자 타입의 상세 — 리터럴 접미사(L/f/d) 규칙이 핵심.
## 📚 출처 (Sources)
- [S1] W3Schools — Java Numbers — https://www.w3schools.com/java/java_data_types_numbers.asp
## 📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "Java Numbers" page (Astra wiki-curation, P-Reinforce v3.1 format).