2nd/10_Wiki/Dev/Topic_Java/Java_Super_Keyword.md

id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit

id	title	category	status	verification_status	canonical_id	aliases	duplicate_of	source_trust_level	confidence_score	created_at	updated_at	review_reason	merge_history	tags	raw_sources	applied_in	github_commit
java-super-keyword	Java Super Keyword	Programming_Language	draft	conceptual		super keyword 자바 super		B	0.9	2026-07-04	2026-07-04			java programming w3schools oop super inheritance	https://www.w3schools.com/java/java_super.asp

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 Keyword의 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):

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).