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- Topic_Programming 최종 문서 수: 2784 → 3985.

10_Wiki/Topic_Programming/Topic_Java/Java_Try_Catch.md

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+---
+id: java-try-catch
+title: "Java Try Catch"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["exception handling", "자바 예외 처리"]
+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", "exceptions", "try-catch"]
+raw_sources: ["https://www.w3schools.com/java/java_try_catch.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Java Try Catch]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+`finally` runs regardless of outcome — even after a caught exception — making it the guaranteed place for cleanup code that must execute whether the try block succeeded or the catch block fired, distinct from code placed after the whole try/catch structure. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Exception** — Java's technical term for the error object thrown when something goes wrong at runtime. [S1]
+- **`try`** — defines a block of code to test for errors during execution. [S1]
+- **`catch(Exception e)`** — defines a block that runs if an error occurs in the try block. [S1]
+- **`finally`** — runs after try/catch regardless of the result. [S1]
+- **`throw`** — creates and raises a custom exception, paired with an exception type (e.g. `ArithmeticException`). [S1]
+- **Common exception types** — `ArithmeticException`, `ArrayIndexOutOfBoundsException`, `ClassNotFoundException`, `FileNotFoundException`, `InputMismatchException`, `IOException`, `NullPointerException`, `NumberFormatException`, `StringIndexOutOfBoundsException`. [S1]
+
+## 📖 세부 내용 (Details)
+- Uncaught exception: `int[] myNumbers = {1, 2, 3}; System.out.println(myNumbers[10]); // ArrayIndexOutOfBoundsException: 10`. [S1]
+- Caught with try/catch: `try { System.out.println(myNumbers[10]); } catch (Exception e) { System.out.println("Something went wrong."); }`. [S1]
+- With finally: `try {...} catch (Exception e) {...} finally { System.out.println("The 'try catch' is finished."); }` — finally always runs. [S1]
+- Custom throw: `static void checkAge(int age) { if (age < 18) { throw new ArithmeticException("Access denied - You must be at least 18 years old."); } else { System.out.println("Access granted - You are old enough!"); } }`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 나이 체크에 throw로 커스텀 예외를 발생시키는 패턴이 실전 검증 로직의 대표 사례다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Try/catch/finally with custom throw (Java):
+```java
+static void checkAge(int age) {
+    if (age < 18) {
+        throw new ArithmeticException("Access denied - You must be at least 18 years old.");
+    } 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 Debugging]], [[Java Exceptions Multiple]], [[Java Try Catch Resources]]
+- **참조 맥락:** 예외 처리의 기초 문법 — 다중 예외 처리(Multiple Exceptions) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Java Exceptions - Try...Catch — https://www.w3schools.com/java/java_try_catch.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Java Exceptions - Try...Catch" page (Astra wiki-curation, P-Reinforce v3.1 format).