---
id: java-anonymous
title: "Java Anonymous"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["anonymous class", "자바 익명 클래스"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.87
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["java", "programming", "w3schools", "oop", "anonymous-class"]
raw_sources: ["https://www.w3schools.com/java/java_anonymous.asp"]
applied_in: []
github_commit: ""
---

# [[Java Anonymous]]

## 🎯 한 줄 통찰 (One-line insight)
An anonymous class body ends with a semicolon (`};`) — an easy detail to miss, since it's not closing a method or normal class, but terminating the object-creation STATEMENT `Animal myAnimal = new Animal() {...}` that happens to contain a class body inline. [S1]

## 🧠 핵심 개념 (Core concepts)
- **Anonymous class** — a nameless class defined and instantiated in the same expression. [S1]
- **Use case** — overriding a method of an existing class/interface without writing a separate named class file. [S1]
- **Extends a class** — `new Animal() { @Override method } ;` — creates a one-off subclass instance inline. [S1]
- **Implements an interface** — the same syntax works to implement an interface on the fly. [S1]
- **Required trailing semicolon** — closes the object-creation statement, not just the class body. [S1]

## 📖 세부 내용 (Details)
- Overriding a class method anonymously: `Animal myAnimal = new Animal() { public void makeSound() { System.out.println("Woof woof"); } };`. [S1]
- Implementing an interface anonymously: `Greeting greet = new Greeting() { public void sayHello() { System.out.println("Hello, World!"); } };`. [S1]
- Use cases listed: overriding a method without a new subclass, quickly implementing an interface, passing small behaviors as objects. [S1]

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

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — 일회성 동작(override/interface 구현)을 별도 파일 없이 즉석에서 정의하는 표준 패턴이다. [S1]

## 💻 코드 패턴 (Code patterns)
Anonymous class implementing an interface on the fly (Java):
```java
interface Greeting {
    void sayHello();
}
Greeting greet = new Greeting() {
    public void sayHello() {
        System.out.println("Hello, World!");
    }
};
greet.sayHello();
```

## ✅ 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 Interface]], [[Java Polymorphism]], [[Java Enums]]
- **참조 맥락:** 일회성 클래스/인터페이스 구현 — Enums 챕터로 이어짐.

## 📚 출처 (Sources)
- [S1] W3Schools — Java Anonymous Class — https://www.w3schools.com/java/java_anonymous.asp

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