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76 lines
3.3 KiB
Markdown
76 lines
3.3 KiB
Markdown
---
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id: java-anonymous
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title: "Java Anonymous"
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category: "Programming_Language"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["anonymous class", "자바 익명 클래스"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.87
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created_at: 2026-07-04
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updated_at: 2026-07-04
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review_reason: ""
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merge_history: []
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tags: ["java", "programming", "w3schools", "oop", "anonymous-class"]
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raw_sources: ["https://www.w3schools.com/java/java_anonymous.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[Java Anonymous]]
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## 🎯 한 줄 통찰 (One-line insight)
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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]
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## 🧠 핵심 개념 (Core concepts)
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- **Anonymous class** — a nameless class defined and instantiated in the same expression. [S1]
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- **Use case** — overriding a method of an existing class/interface without writing a separate named class file. [S1]
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- **Extends a class** — `new Animal() { @Override method } ;` — creates a one-off subclass instance inline. [S1]
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- **Implements an interface** — the same syntax works to implement an interface on the fly. [S1]
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- **Required trailing semicolon** — closes the object-creation statement, not just the class body. [S1]
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## 📖 세부 내용 (Details)
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- Overriding a class method anonymously: `Animal myAnimal = new Animal() { public void makeSound() { System.out.println("Woof woof"); } };`. [S1]
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- Implementing an interface anonymously: `Greeting greet = new Greeting() { public void sayHello() { System.out.println("Hello, World!"); } };`. [S1]
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- Use cases listed: overriding a method without a new subclass, quickly implementing an interface, passing small behaviors as objects. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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소스에서 모순되는 정보는 발견되지 않음.
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — 일회성 동작(override/interface 구현)을 별도 파일 없이 즉석에서 정의하는 표준 패턴이다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Anonymous class implementing an interface on the fly (Java):
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```java
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interface Greeting {
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void sayHello();
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}
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Greeting greet = new Greeting() {
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public void sayHello() {
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System.out.println("Hello, World!");
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}
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};
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greet.sayHello();
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```
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.87
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[Java Tutorial]]
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- **관련 개념:** [[Java Interface]], [[Java Polymorphism]], [[Java Enums]]
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- **참조 맥락:** 일회성 클래스/인터페이스 구현 — Enums 챕터로 이어짐.
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## 📚 출처 (Sources)
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- [S1] W3Schools — Java Anonymous Class — https://www.w3schools.com/java/java_anonymous.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "Java Anonymous Class" page (Astra wiki-curation, P-Reinforce v3.1 format).
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