---
id: java-methods-param
title: "Java Methods Param"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["method parameters", "자바 메서드 매개변수"]
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", "methods", "parameters"]
raw_sources: ["https://www.w3schools.com/java/java_methods_param.asp"]
applied_in: []
github_commit: ""
---

# [[Java Methods Param]]

## 🎯 한 줄 통찰 (One-line insight)
"Parameter" and "argument" are precisely distinguished, not used interchangeably — the parameter is the named variable in the method signature (`fname`), while the arguments are the actual values passed at call time (`"Liam"`, `"Jenny"`, `"Anja"`). [S1]

## 🧠 핵심 개념 (Core concepts)
- **Parameter** — a variable specified in the method's parentheses, acting like a local variable inside the method. [S1]
- **Argument** — the concrete value passed when calling the method. [S1]
- **Multiple parameters** — comma-separated, e.g. `(String fname, int age)`. [S1]
- **Order/count matching rule** — the call's arguments must match the parameter count and order exactly. [S1]
- **If/else inside methods** — a common pattern for validation-style methods. [S1]

## 📖 세부 내용 (Details)
- Single parameter: `static void myMethod(String fname) { System.out.println(fname + " Refsnes"); } ... myMethod("Liam"); // Liam Refsnes`. [S1]
- Multiple parameters: `static void myMethod(String fname, int age) { System.out.println(fname + " is " + age); } ... myMethod("Liam", 5); // Liam is 5`. [S1]
- If/else inside a method: `static void checkAge(int age) { if (age < 18) { System.out.println("Access denied..."); } else { System.out.println("Access granted..."); } } ... checkAge(20); // Access granted`. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
- **매개변수 vs 인자 구분**: 정의부의 이름(매개변수)과 호출 시 전달되는 값(인자)을 명확히 구분한다는 점이 소스에서 강조됨. [S1]

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — 나이 체크(checkAge)처럼 조건 검증 로직을 메서드로 캡슐화하는 표준 패턴이다. [S1]

## 💻 코드 패턴 (Code patterns)
Method with if/else validation logic (Java):
```java
static void checkAge(int age) {
    if (age < 18) {
        System.out.println("Access denied - You are not old enough!");
    } else {
        System.out.println("Access granted - You are old enough!");
    }
}
```

## ✅ 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 Methods]], [[Java Methods Return]], [[Java If Else]]
- **참조 맥락:** 메서드에 데이터를 전달하는 방법 — 반환값 챕터로 이어짐.

## 📚 출처 (Sources)
- [S1] W3Schools — Java Method Parameters — https://www.w3schools.com/java/java_methods_param.asp

## 📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "Java Method Parameters" page (Astra wiki-curation, P-Reinforce v3.1 format).
