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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
Scanner class
자바 사용자 입력
B 0.9 2026-07-04 2026-07-04
java
programming
w3schools
scanner
user-input
https://www.w3schools.com/java/java_user_input.asp

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 in java.util used to read user input. [S1]
  • Type-specific read methodsnextBoolean(), nextByte(), nextDouble(), nextFloat(), nextInt(), nextLine() (String), nextLong(), nextShort(). [S1]
  • System.in — the standard input stream passed to new Scanner(System.in). [S1]
  • Mismatched input risk — wrong-type input (e.g. text into nextInt()) throws InputMismatchException. [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)

📚 출처 (Sources)

📝 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).