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72 lines
3.4 KiB
Markdown
72 lines
3.4 KiB
Markdown
---
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id: java-debugging
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title: "Java Debugging"
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category: "Programming_Language"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["자바 디버깅"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.87
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created_at: 2026-07-04
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updated_at: 2026-07-04
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review_reason: ""
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merge_history: []
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tags: ["java", "programming", "w3schools", "debugging"]
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raw_sources: ["https://www.w3schools.com/java/java_debugging.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[Java Debugging]]
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## 🎯 한 줄 통찰 (One-line insight)
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Print-statement debugging doubles as a crash locator — placing `println` calls before and after a suspect line (like a division) reveals exactly which line crashed, since the source shows "Before division" printing successfully while the line after the crash never executes at all. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Debugging** — identifying and fixing errors/bugs; involves reading error messages, tracing variable values, testing code in isolation. [S1]
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- **Print-statement debugging** — the most basic technique: `System.out.println()` to check values and program flow. [S1]
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- **Bracketing suspect code** — print before AND after a risky line to isolate exactly where a crash happens. [S1]
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- **Variable-value checking** — print variable values to verify conditions behave as expected. [S1]
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- **IDE debuggers** — breakpoints, step-through execution, real-time variable inspection (IntelliJ, Eclipse, NetBeans). [S1]
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- **Debugging checklist** — read full error messages, check variable initialization, print to trace, watch for off-by-one errors, comment out code sections to isolate bugs. [S1]
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## 📖 세부 내용 (Details)
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- Crash isolation via print bracketing: `System.out.println("Before division"); int result = x / y; System.out.println("Result: " + result); // never runs`. [S1]
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- Condition verification: `int age = 17; System.out.println("Age: " + age); if (age >= 18) {...} else {...}` — test by changing age to 18/19 and observing output. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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소스에서 모순되는 정보는 발견되지 않음.
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — print 문으로 크래시 지점을 특정하는 기법은 예외 처리(Try Catch) 학습 전 단계의 기초 디버깅 방법이다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Bracketing a suspect line with print statements to locate a crash (Java):
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```java
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int x = 10;
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int y = 0;
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System.out.println("Before division"); // prints
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int result = x / y; // crashes here
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System.out.println("Result: " + result); // never runs
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```
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.87
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[Java Tutorial]]
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- **관련 개념:** [[Java Errors]], [[Java Try Catch]]
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- **참조 맥락:** 에러 발견 후 디버깅 기법 — 예외 처리(try-catch) 챕터로 직접 이어짐.
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## 📚 출처 (Sources)
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- [S1] W3Schools — Java Debugging — https://www.w3schools.com/java/java_debugging.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "Java Debugging" page (Astra wiki-curation, P-Reinforce v3.1 format).
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