2nd/10_Wiki/Dev/Topic_Java/Java_Debugging.md

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

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-debugging	Java Debugging	Programming_Language	draft	conceptual		자바 디버깅		B	0.87	2026-07-04	2026-07-04			java programming w3schools debugging	https://www.w3schools.com/java/java_debugging.asp

Java Debugging

🎯 한 줄 통찰 (One-line insight)

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]

🧠 핵심 개념 (Core concepts)

• Debugging — identifying and fixing errors/bugs; involves reading error messages, tracing variable values, testing code in isolation. [S1]
• Print-statement debugging — the most basic technique: System.out.println() to check values and program flow. [S1]
• Bracketing suspect code — print before AND after a risky line to isolate exactly where a crash happens. [S1]
• Variable-value checking — print variable values to verify conditions behave as expected. [S1]
• IDE debuggers — breakpoints, step-through execution, real-time variable inspection (IntelliJ, Eclipse, NetBeans). [S1]
• 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]

📖 세부 내용 (Details)

• Crash isolation via print bracketing: System.out.println("Before division"); int result = x / y; System.out.println("Result: " + result); // never runs. [S1]
• 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]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — print 문으로 크래시 지점을 특정하는 기법은 예외 처리(Try Catch) 학습 전 단계의 기초 디버깅 방법이다. [S1]

💻 코드 패턴 (Code patterns)

Bracketing a suspect line with print statements to locate a crash (Java):

int x = 10;
int y = 0;
System.out.println("Before division"); // prints
int result = x / y;                    // crashes here
System.out.println("Result: " + result); // never runs

✅ 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 Errors, Java Try Catch
• 참조 맥락: 에러 발견 후 디버깅 기법 — 예외 처리(try-catch) 챕터로 직접 이어짐.

📚 출처 (Sources)

• [S1] W3Schools — Java Debugging — https://www.w3schools.com/java/java_debugging.asp

📝 변경 이력 (Change history)

• 2026-07-04: Initial draft synthesized from the W3Schools "Java Debugging" page (Astra wiki-curation, P-Reinforce v3.1 format).