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effectivejava's Introduction

EffectiveJava

Ch3

Item 10) equals는 일반 규약을 지켜 재정의하라

  • 객체 식별성(object identity) => 두 객체가 물리적으로(주소가) 같은가
  • 논리적 동치성(logical equality) => 내용이 같은가

equals()를 재정의해야할 때는
=> 논리적 동치성이 필요할 때
=> 상위 클래스에서는 객체 식별성에 대한 비교만 했을 때

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