---
id: java-booleans-real-life
title: "Java Booleans Real Life"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["자바 불리언 실전 예제"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.87
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["java", "programming", "w3schools", "boolean", "if-else"]
raw_sources: ["https://www.w3schools.com/java/java_booleans_reallife.asp"]
applied_in: []
github_commit: ""
---

# [[Java Booleans Real Life]]

## 🎯 한 줄 통찰 (One-line insight)
A raw boolean check (`myAge >= votingAge`) becomes actionable once wrapped in an if/else — this chapter's whole point is showing that booleans are the RAW MATERIAL, and if/else is what turns them into branching program behavior. [S1]

## 🧠 핵심 개념 (Core concepts)
- **Voting-age check** — `int myAge = 25; int votingAge = 18; System.out.println(myAge >= votingAge);` prints just `true`/`false`. [S1]
- **Wrapped in if/else** — produces an actual human-readable message depending on the result. [S1]
- **Booleans as the foundation** — the source explicitly states booleans underlie all Java comparisons and conditions. [S1]

## 📖 세부 내용 (Details)
- Raw boolean output: `System.out.println(myAge >= votingAge); // true`. [S1]
- Actionable via if/else: [S1]
```java
if (myAge >= votingAge) {
    System.out.println("Old enough to vote!");
} else {
    System.out.println("Not old enough to vote.");
}
```

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
소스에서 모순되는 정보는 발견되지 않음.

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — 다음 챕터(If...Else)로 넘어가기 전, boolean이 조건문의 기반이라는 점을 명시적으로 예고한다. [S1]

## 💻 코드 패턴 (Code patterns)
Boolean check turned actionable via if/else (Java):
```java
int myAge = 25;
int votingAge = 18;
if (myAge >= votingAge) {
    System.out.println("Old enough to vote!");
} else {
    System.out.println("Not old enough to vote.");
}
```

## ✅ 검증 상태 및 신뢰도
- **상태:** draft
- **검증 단계:** conceptual
- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
- **신뢰 점수:** 0.87
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[Java Tutorial]]
- **관련 개념:** [[Java Booleans]], [[Java If Else]]
- **참조 맥락:** boolean이 모든 조건문의 기반이라는 점을 예고 — 다음 챕터 If...Else로 직접 연결.

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

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