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-strings
+title: "Java Strings"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["자바 문자열"]
+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", "strings"]
+raw_sources: ["https://www.w3schools.com/java/java_strings.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Java Strings]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+A Java String is an object with methods, not a raw character array — `length()`, `indexOf()`, `charAt()`, `equals()`, and `trim()` are all method calls (`str.method()`), not built-in functions like Python's `len(str)`. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **String** — a double-quoted, object-based text container in Java (not a primitive). [S1]
+- **`length()`** — returns character count. [S1]
+- **`toUpperCase()` / `toLowerCase()`** — case conversion. [S1]
+- **`indexOf(text)`** — position of the first occurrence (0-indexed). [S1]
+- **`charAt(index)`** — the character at a specific position. [S1]
+- **`equals(other)`** — compares string CONTENT, unlike `==` which compares references. [S1]
+- **`trim()`** — removes leading/trailing whitespace. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Method-call syntax throughout** — every string operation is `str.method()`, contrasting with Python's mix of methods (`str.upper()`) and built-in functions (`len(str)`). [S1]
+- **`equals()` not `==`** — the tutorial specifically teaches `equals()` for string comparison, implying `==` would compare object references rather than content (a classic Java gotcha, though not elaborated here). [S1]
+
+## 📖 세부 내용 (Details)
+- Length: `String txt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; txt.length()`. [S1]
+- Case conversion: `txt.toUpperCase(); txt.toLowerCase();`. [S1]
+- Find position: `String txt = "Please locate where 'locate' occurs!"; txt.indexOf("locate"); // 7`. [S1]
+- Character access: `String txt = "Hello"; txt.charAt(0); // H`. [S1]
+- Content comparison: `txt1.equals(txt2)`. [S1]
+- Trim whitespace: `String txt = " Hello World "; txt.trim(); // "Hello World"`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 이후 Concatenation/Numbers and Strings/Special Characters 챕터에서 문자열 조작이 심화된다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Content comparison with equals() (Java):
+```java
+String txt1 = "Hello";
+String txt2 = "Hello";
+System.out.println(txt1.equals(txt2));  // true
+```
+
+## ✅ 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 Strings Concat]], [[Java Strings Numbers]], [[Java Characters]]
+- **참조 맥락:** 문자열 메서드의 기초 — equals()로 내용 비교(==와 구분)해야 함이 핵심.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Java Strings — https://www.w3schools.com/java/java_strings.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Java Strings" page (Astra wiki-curation, P-Reinforce v3.1 format).