---
id: java-list
title: "Java List"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["List interface", "자바 리스트"]
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", "collections-framework", "list"]
raw_sources: ["https://www.w3schools.com/java/java_list.asp"]
applied_in: []
github_commit: ""
---

# [[Java List]]

## 🎯 한 줄 통찰 (One-line insight)
`List` is an interface, so `new List<String>()` is impossible — you must always instantiate a CONCRETE implementer like `ArrayList` or `LinkedList`, a distinction that mirrors the abstract-class rule from the OOP section (cannot instantiate the abstraction itself). [S1]

## 🧠 핵심 개념 (Core concepts)
- **`List` interface** — ordered collection; supports index access, duplicates, and preserves insertion order. [S1]
- **Cannot instantiate directly** — must use an implementing class: `ArrayList` (resizable array, fast random access) or `LinkedList` (linked container chain, easy insert/remove). [S1]
- **Common methods** — `add()`, `get()`, `set()`, `remove()`, `size()`. [S1]
- **List vs. plain array** — array is fixed-size and not part of the Collections Framework; List implementations are dynamic-size and part of the framework. [S1]

## 📖 세부 내용 (Details)
- Method table: `add()` (append), `get()` (read by index), `set()` (replace by index), `remove()` (delete by index), `size()` (count). [S1]
- Comparison table: Array (fixed size, faster raw performance, not in Collections Framework) vs. List (dynamic size, more flexible/feature-rich, part of Collections Framework). [S1]

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

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — 순서와 중복을 허용해야 하는 데이터 저장에 List 인터페이스가 표준적으로 쓰인다. [S1]

## 💻 코드 패턴 (Code patterns)
해당 챕터는 개념/메서드표 중심으로 별도 실행 코드 예제가 없음 — 다음 챕터([[Java ArrayList]])에서 List 구현체 실습이 시작된다.

## ✅ 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 Collections]], [[Java ArrayList]], [[Java LinkedList]]
- **참조 맥락:** List 인터페이스의 기초 — ArrayList/LinkedList 구현체 챕터로 직접 이어짐.

## 📚 출처 (Sources)
- [S1] W3Schools — Java List Interface — https://www.w3schools.com/java/java_list.asp

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