---
id: java-super-keyword
title: "Java Super Keyword"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["super keyword", "자바 super"]
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", "oop", "super", "inheritance"]
raw_sources: ["https://www.w3schools.com/java/java_super.asp"]
applied_in: []
github_commit: ""
---

# [[Java Super Keyword]]

## 🎯 한 줄 통찰 (One-line insight)
`super()` (calling the parent constructor) must be the FIRST statement in a subclass constructor — the exact same rule as `this()` for constructor chaining — meaning Java allows only one "delegate first" call per constructor, either to another local constructor or to the parent's, never both, and only at the very start. [S1]

## 🧠 핵심 개념 (Core concepts)
- **`super`** — refers to the parent class of a subclass; primarily resolves name collisions between super/subclass methods or attributes. [S1]
- **`super.method()`** — calls the parent's version of an overridden method. [S1]
- **`super.attribute`** — accesses the parent's attribute when the subclass shadows it with a same-named field. [S1]
- **`super()`** — calls the parent class's constructor; must be the first statement in the subclass constructor. [S1]

## 📖 세부 내용 (Details)
- Calling parent method: `class Dog extends Animal { public void animalSound() { super.animalSound(); System.out.println("The dog says: bow wow"); } }` — outputs both the parent's and child's messages. [S1]
- Accessing parent attribute: `class Animal { String type = "Animal"; } class Dog extends Animal { String type = "Dog"; public void printType() { System.out.println(super.type); } }` — prints "Animal", not "Dog". [S1]
- Calling parent constructor: `class Animal { Animal() { System.out.println("Animal is created"); } } class Dog extends Animal { Dog() { super(); System.out.println("Dog is created"); } }` — prints both messages in order. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
- **super() 호출 위치 제약**: 서브클래스 생성자 내 첫 번째 문장이어야 한다는 점이 [[Java This Keyword]]의 this() 규칙과 동일하게 강조됨. [S1]

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — Animal→Dog 계층에서 부모 생성자/메서드/속성에 접근하는 표준 패턴이다. [S1]

## 💻 코드 패턴 (Code patterns)
Calling the parent constructor first via super() (Java):
```java
class Animal {
    Animal() {
        System.out.println("Animal is created");
    }
}
class Dog extends Animal {
    Dog() {
        super(); // must be first statement
        System.out.println("Dog is created");
    }
}
```

## ✅ 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 Inheritance]], [[Java This Keyword]], [[Java Polymorphism]]
- **참조 맥락:** 부모 클래스 접근 키워드 — this() 규칙과 대칭되는 제약을 가짐.

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

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