---
id: java-else
title: "Java Else"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["else statement", "자바 else"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.88
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["java", "programming", "w3schools", "conditions", "else"]
raw_sources: ["https://www.w3schools.com/java/java_conditions_else.asp"]
applied_in: []
github_commit: ""
---

# [[Java Else]]

## 🎯 한 줄 통찰 (One-line insight)
A stray semicolon after `if (condition)` silently breaks an if/else pair — the source explicitly warns that `if (condition);` ends the statement early, making the following `else` behave unexpectedly (or fail to compile as attached to that if). [S1]

## 🧠 핵심 개념 (Core concepts)
- **`else`** — runs a block only when the paired `if` condition is false; else itself carries no condition. [S1]
- **Syntax** — `if (condition) { ... } else { ... }`. [S1]
- **No semicolon after if(condition)** — doing so ends the if-statement prematurely and breaks the else pairing. [S1]

## 📖 세부 내용 (Details)
- Basic else: `boolean isRaining = false; if (isRaining) { System.out.println("Bring an umbrella!"); } else { System.out.println("No rain today, no need for an umbrella!"); }`. [S1]
- Time-based greeting: `int time = 20; if (time < 18) { System.out.println("Good day."); } else { System.out.println("Good evening."); } // Outputs "Good evening."`. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
- **세미콜론 함정**: `if (condition)` 뒤에 세미콜론을 붙이면 안 된다는 점이 소스에서 별도 Notes로 강조됨. [S1]

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — 시간대별 인사말, 비/우산 여부 등 이진 분기의 표준 패턴이다. [S1]

## 💻 코드 패턴 (Code patterns)
Binary branch with else (Java):
```java
int time = 20;
if (time < 18) {
    System.out.println("Good day.");
} else {
    System.out.println("Good evening.");
}
```

## ✅ 검증 상태 및 신뢰도
- **상태:** draft
- **검증 단계:** conceptual
- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
- **신뢰 점수:** 0.88
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[Java Tutorial]]
- **관련 개념:** [[Java If Else]], [[Java Else If]]
- **참조 맥락:** if의 false 분기 처리 — else if로 다중 조건 분기 확장.

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

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