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Topic_CSS/Topic_HTML/Topic_JavaScript/Topic_Prompt/Topic_Comfyui 등 기존 카테고리 폴더를 정리하고, Topic_Graphic/Dev 등 신규 산출물과 Topics 내부 세션/메모리 기록을 동기화.
3.2 KiB
3.2 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-user-input | Java User Input | Programming_Language | draft | conceptual |
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B | 0.9 | 2026-07-04 | 2026-07-04 |
|
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Java User Input
🎯 한 줄 통찰 (One-line insight)
Reading the wrong type from Scanner (e.g., text where a number is expected via nextInt()) throws an InputMismatchException rather than failing silently or auto-converting — user input handling in Java requires either exception handling or careful type-matched reads. [S1]
🧠 핵심 개념 (Core concepts)
Scanner— class injava.utilused to read user input. [S1]- Type-specific read methods —
nextBoolean(),nextByte(),nextDouble(),nextFloat(),nextInt(),nextLine()(String),nextLong(),nextShort(). [S1] System.in— the standard input stream passed tonew Scanner(System.in). [S1]- Mismatched input risk — wrong-type input (e.g. text into
nextInt()) throwsInputMismatchException. [S1]
📖 세부 내용 (Details)
- Basic string input:
Scanner myObj = new Scanner(System.in); String userName = myObj.nextLine();. [S1] - Mixed-type input:
String name = myObj.nextLine(); int age = myObj.nextInt(); double salary = myObj.nextDouble();. [S1]
⚖️ 모순 및 업데이트 (Contradictions & updates)
- 타입 불일치 예외: 잘못된 타입의 입력을 읽으면 InputMismatchException이 발생한다는 점이 명시되고, 예외 처리는 별도 Exceptions 챕터로 안내됨. [S1]
🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — 이름/나이/급여처럼 여러 타입의 사용자 입력을 순차적으로 읽는 표준 패턴이다. [S1]
💻 코드 패턴 (Code patterns)
Reading mixed-type user input with Scanner (Java):
import java.util.Scanner;
class Main {
public static void main(String[] args) {
Scanner myObj = new Scanner(System.in);
String name = myObj.nextLine();
int age = myObj.nextInt();
double salary = myObj.nextDouble();
}
}
✅ 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 Packages, Java Date, Java Try Catch
- 참조 맥락: 사용자 입력 처리 — 예외 처리(Try Catch) 챕터에서 잘못된 입력 대응법이 다뤄짐.
📚 출처 (Sources)
- [S1] W3Schools — Java User Input (Scanner) — https://www.w3schools.com/java/java_user_input.asp
📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "Java User Input" page (Astra wiki-curation, P-Reinforce v3.1 format).