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10_Wiki/Topic_Programming/Topic_Java/Java_Algorithms.md

@@ -0,0 +1,75 @@
+---
+id: java-algorithms
+title: "Java Algorithms"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["Collections class algorithms", "자바 알고리즘"]
+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", "algorithms", "collections"]
+raw_sources: ["https://www.w3schools.com/java/java_algorithms.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Java Algorithms]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+`Collections.binarySearch()` REQUIRES the list to already be sorted — the example explicitly calls `Collections.sort(names)` immediately before `binarySearch()`, since binary search's speed advantage depends entirely on the data being in order; searching an unsorted list with it gives undefined/incorrect results. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Algorithm** — a procedure to solve a problem (search, sort, manipulate data structures). [S1]
+- **`Collections` class** — provides built-in algorithms in `java.util`, avoiding the need to hand-write them. [S1]
+- **`Collections.binarySearch(list, key)`** — fast search, but requires a pre-sorted list. [S1]
+- **`Collections.sort(list)`** / **`sort(list, reverseOrder())`** — ascending/descending sort. [S1]
+- **`Collections.max()` / `min()`** — largest/smallest element. [S1]
+- **`Collections.shuffle()`** — randomly reorders elements. [S1]
+- **`Collections.frequency(list, element)`** — counts occurrences of a value. [S1]
+- **`Collections.swap(list, i, j)`** — swaps two elements by index. [S1]
+
+## 📖 세부 내용 (Details)
+- Binary search (must sort first): `Collections.sort(names); int index = Collections.binarySearch(names, "Angie");`. [S1]
+- Max/min: `Collections.max(numbers); Collections.min(numbers);`. [S1]
+- Shuffle: `Collections.shuffle(cards);`. [S1]
+- Frequency: `int count = Collections.frequency(fruits, "Banana");`. [S1]
+- Swap: `Collections.swap(fruits, 0, 2); // Swap first and third element`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **정렬 선행 조건**: binarySearch()는 리스트가 반드시 정렬되어 있어야 정확히 동작한다는 점이 예제에서 명시적으로 지켜짐. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 카드 셔플(Collections.shuffle)이나 과일 빈도 계산(frequency)이 실전 알고리즘 활용의 대표 사례다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Sort-then-binarySearch pattern (Java):
+```java
+ArrayList<String> names = new ArrayList<>();
+names.add("Liam"); names.add("Jenny"); names.add("Kasper"); names.add("Angie");
+Collections.sort(names); // required before binarySearch
+int index = Collections.binarySearch(names, "Angie");
+```
+
+## ✅ 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 Sort List]], [[Java Iterator]], [[Java Advanced Sorting]]
+- **참조 맥락:** Collections 클래스의 내장 알고리즘 — 고급 정렬(Advanced Sorting) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Java Algorithms — https://www.w3schools.com/java/java_algorithms.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Java Algorithms" page (Astra wiki-curation, P-Reinforce v3.1 format).