const{Fragment:i,jsx:h,jsxs:s}=arguments[0];function _createMdxContent(t){const e={a:"a",code:"code",figcaption:"figcaption",figure:"figure",h2:"h2",li:"li",p:"p",pre:"pre",span:"span",table:"table",tbody:"tbody",td:"td",th:"th",thead:"thead",tr:"tr",ul:"ul",...t.components},{Callout:k,E:a,Note:l,RelatedPost:d,Tab:g,Tabs:r}=e;return k||_missingMdxReference("Callout",!0),a||_missingMdxReference("E",!0),l||_missingMdxReference("Note",!0),d||_missingMdxReference("RelatedPost",!0),g||_missingMdxReference("Tab",!0),r||_missingMdxReference("Tabs",!0),s(i,{children:[s(e.p,{children:["이펙티브 자바 3판 4장은 ",h(a,{children:"클래스와 인터페이스"}),"를 다룬다. 같은 동작을 코드에 담아도 클래스 모양과 인터페이스 사용 방식에 따라 가독성, 결합도, 확장 가능성이 크게 달라진다는 관점이다. 이 글에서는 4장에서 자주 인용되는 7가지 아이템을 자바 예시 코드와 Before/After 비교로 정리한다."]}),"\n",h(l,{title:"이 글에서 다루는 7가지 아이템",children:s(e.ul,{children:["\n",h(e.li,{children:"Item 15. 클래스와 멤버의 접근 권한을 최소화하라"}),"\n",h(e.li,{children:"Item 17. 변경 가능성을 최소화하라"}),"\n",h(e.li,{children:"Item 18. 상속보다는 컴포지션을 사용하라"}),"\n",h(e.li,{children:"Item 19. 상속을 고려해 설계하고 문서화하라, 그러지 않았다면 상속을 금지하라"}),"\n",h(e.li,{children:"Item 20. 추상 클래스보다는 인터페이스를 우선하라"}),"\n",h(e.li,{children:"Item 23. 태그 달린 클래스보다는 클래스 계층 구조를 활용하라"}),"\n",h(e.li,{children:"Item 24. 멤버 클래스는 되도록 static으로 만들라"}),"\n"]})}),"\n",s(e.p,{children:["이 글의 코드 예시는 가상 주문 도메인을 공유한다. 식별자 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"OrderId"})})})}),", 값 객체 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"Money"})})})}),", 라인 아이템 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"LineItem"})})})}),", 그리고 집합 객체 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"Order"})})})}),". 도형 계층(",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"Shape"})})})}),")과 컬렉션 래퍼만 별도 예시로 등장한다."]}),"\n",h(e.h2,{id:"접근-권한-최소화",children:"접근 권한 최소화"}),"\n",s(e.p,{children:["잘 설계된 컴포넌트는 클래스 내부 데이터와 구현 정보를 숨겨 ",h(a,{children:"캡슐화(encapsulation)"})," 또는 ",h(a,{children:"정보 은닉(information hiding)"}),"이 잘 되어 있다. 외부에서 알 필요가 없는 것은 보이지 않게 하고, 외부 API로 약속한 것만 노출한다. 이렇게 분리해 두면 내부 구현을 자유롭게 바꿔도 외부 코드가 깨지지 않는다."]}),"\n",h(e.p,{children:"자바의 접근 제어자는 네 단계다."}),"\n",s(e.table,{children:[h(e.thead,{children:s(e.tr,{children:[h(e.th,{children:"제어자"}),h(e.th,{children:"가시 범위"})]})}),s(e.tbody,{children:[s(e.tr,{children:[h(e.td,{children:h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"private"})})})})}),h(e.td,{children:"선언한 클래스 안에서만"})]}),s(e.tr,{children:[h(e.td,{children:"package-private (default)"}),h(e.td,{children:"같은 패키지 안"})]}),s(e.tr,{children:[h(e.td,{children:h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"protected"})})})})}),h(e.td,{children:"같은 패키지 + 하위 클래스"})]}),s(e.tr,{children:[h(e.td,{children:h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"public"})})})})}),h(e.td,{children:"모든 곳"})]})]})]}),"\n",s(e.p,{children:["기본 원칙은 단순하다. ",h(a,{children:"모든 클래스와 멤버의 접근성을 가능한 한 좁힌다."})," 톱레벨 클래스는 패키지 외부에서 쓸 일이 없으면 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"package-private"})})})}),"로, 멤버는 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"private"})})})}),"을 기본으로 두고 같은 패키지의 다른 클래스가 써야 할 때만 한 단계씩 푼다."]}),"\n",s(e.p,{children:["특히 자주 무너지는 지점이 두 개 있다. 하나는 ",h(a,{children:"public 가변 필드"}),", 다른 하나는 ",h(a,{children:"public 배열·컬렉션 필드"}),"다. 가변 필드를 외부에 그대로 열면 누구나 값을 바꿀 수 있어 클래스가 자기 상태를 보장하지 못하고, 배열을 그대로 노출하면 길이가 0이 아닌 한 내부 데이터가 통째로 새어 나간다."]}),"\n",s(r,{group:"access-control",children:[h(g,{label:"Before: public 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// 방어적 복사"})]}),"\n",h(e.span,{"data-line":"",children:h(e.span,{style:{"--shiki-atom-light":"#383A42","--shiki-atom-dark":"#ABB2BF","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#999999","--shiki-vitesse-dark":"#666666"},children:" }"})}),"\n",h(e.span,{"data-line":"",children:" "}),"\n",s(e.span,{"data-line":"",children:[h(e.span,{style:{"--shiki-atom-light":"#A626A4","--shiki-atom-dark":"#C678DD","--shiki-github-light":"#D73A49","--shiki-github-dark":"#F97583","--shiki-vitesse-light":"#AB5959","--shiki-vitesse-dark":"#CB7676"},children:" public"}),h(e.span,{style:{"--shiki-atom-light":"#C18401","--shiki-atom-dark":"#E5C07B","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#393A34","--shiki-vitesse-dark":"#DBD7CAEE"},children:" 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",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"lines()"})})})}),"는 내부 리스트를 그대로 돌려주지 않고 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"List.copyOf"})})})}),"로 ",h(a,{children:"읽기 전용 복사본"}),"을 반환한다. 외부가 가져간 리스트를 수정해도 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"Order"})})})})," 내부 상태는 그대로다."]}),"\n",h(k,{type:"info",title:"기억할 한 줄",children:h(e.p,{children:"public 가변 필드는 거의 항상 잘못된 신호다. 노출이 필요하면 메서드를 통해, 컬렉션이라면 불변 복사본으로."})}),"\n",h(e.h2,{id:"불변-객체-만들기",children:"불변 객체 만들기"}),"\n",s(e.p,{children:["변경 가능성을 줄이는 가장 직접적인 방법은 ",h(a,{children:"불변 객체(immutable object)"}),"를 만드는 것이다. 불변 객체는 단순하다. 생성된 시점부터 파괴되는 시점까지 동일한 값을 유지한다. 동기화를 고려할 필요가 없으며 사용에 안전하고, 여러 스레드가 공유해도 문제가 없다. 단점이 있다면 새 값이 필요할 때마다 객체를 새로 만들어야 한다는 것이다."]}),"\n",h(e.p,{children:"불변 클래스를 만드는 규칙은 다섯 가지다."}),"\n",s(e.ul,{children:["\n",h(e.li,{children:"객체 상태를 변경하는 메서드(setter 등)를 제공하지 않는다."}),"\n",s(e.li,{children:["클래스를 확장할 수 없게 한다 (보통 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"final"})})})}),")."]}),"\n",s(e.li,{children:["모든 필드를 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"final"})})})}),"로 선언한다."]}),"\n",s(e.li,{children:["모든 필드를 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"private"})})})}),"으로 선언한다."]}),"\n",h(e.li,{children:"자신 외에는 내부의 가변 컴포넌트에 접근할 수 없게 한다."}),"\n"]}),"\n",s(e.p,{children:["자주 쓰이는 패턴은 ",h(a,{children:"final 클래스 + private 생성자 + 정적 팩토리"}),"다. 정적 팩토리를 두면 자주 쓰이는 값을 캐싱해 같은 인스턴스를 재사용할 수 있고, 나중에 하위 타입으로 교체할 자유도 남는다."]}),"\n",s(r,{group:"immutable-money",children:[h(g,{label:"Before: 가변 Money",children:s(e.figure,{"data-rehype-pretty-code-figure":"",children:[s(e.figcaption,{"data-rehype-pretty-code-title":"","data-language":"java","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light 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vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"plus"})})})}),"에 주목한다. 메서드 이름이 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"add"})})})}),"가 아니라 ",h(a,{children:h(e.code,{children:"plus"})}),"인 이유는 자기 상태를 바꾸지 않고 새 객체를 반환한다는 함수형 의도를 이름에 박아 두기 위해서다. ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"BigInteger.add"})})})}),", ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"String.concat"})})})}),", ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"LocalDate.plusDays"})})})}),"가 모두 같은 패턴이다."]}),"\n",s(e.p,{children:["모든 클래스를 불변으로 만들 수는 없다. 다만 불변으로 만들 수 없는 클래스라도 변경 가능한 부분을 최소한으로 줄이면 객체 상태를 예측하기 쉬워지고 오류 가능성이 줄어든다. 변경이 꼭 필요한 필드를 제외한 나머지는 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"final"})})})}),"로 선언한다."]}),"\n",h(k,{type:"info",title:"기억할 한 줄",children:s(e.p,{children:["다른 합당한 이유가 없다면 모든 필드는 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"private final"})})})}),"이어야 한다."]})}),"\n",h(e.h2,{id:"상속보다-컴포지션",children:"상속보다 컴포지션"}),"\n",h(e.p,{children:"상속은 강력한 도구지만, 잘못 사용하면 캡슐화를 깨뜨린다. 상위 클래스의 구현이 하위 클래스에 그대로 드러나기 때문이다. 상위 클래스가 어느 시점에 어느 메서드를 어떤 순서로 호출하는지가 하위 클래스 동작에 영향을 주므로, 상위 클래스가 릴리스마다 내부 구현을 바꾸면 하위 클래스도 따라 깨질 수 있다."}),"\n",s(e.p,{children:["이펙티브 자바의 고전 예시는 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"HashSet"})})})}),"을 상속해 ",h(a,{children:"지금까지 추가된 원소 수"}),"를 세려는 시도다. 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",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"InstrumentedSet"})})})}),"이 카운트만 추가한다. 이제 위임 대상이 무엇이든 카운트는 정확히 한 번만 올라간다. 위임받는 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"Set"})})})}),"은 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"HashSet"})})})}),"이든 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"TreeSet"})})})}),"이든 상관없다."]}),"\n",s(e.p,{children:["상속은 ",h(a,{children:"순수한 is-a 관계"}),"일 때만 사용한다. 그 경우에도 상위 클래스가 확장을 염두에 두고 설계됐는지를 점검한다. 두 조건 모두를 만족하지 못하면 컴포지션이 안전한 기본값이다."]}),"\n",h(e.h2,{id:"상속용-설계와-문서화",children:"상속용 설계와 문서화"}),"\n",s(e.p,{children:["그래도 상속을 허용해야 한다면, 클래스를 ",h(a,{children:"상속용으로 설계하고 문서화"}),"해야 한다. 핵심은 두 가지다."]}),"\n",s(e.p,{children:["첫째, 재정의 가능한 메서드를 클래스 내부에서 어떻게 사용하는지 공개한다. 어떤 시점에 어떤 메서드를 어떤 순서로 호출하는지가 곧 하위 클래스가 의지하게 될 약속이다. 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// 항상 초기화 후 호출됨"})]}),"\n",h(e.span,{"data-line":"",children:h(e.span,{style:{"--shiki-atom-light":"#383A42","--shiki-atom-dark":"#ABB2BF","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#999999","--shiki-vitesse-dark":"#666666"},children:" }"})}),"\n",h(e.span,{"data-line":"",children:h(e.span,{style:{"--shiki-atom-light":"#383A42","--shiki-atom-dark":"#ABB2BF","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#999999","--shiki-vitesse-dark":"#666666"},children:"}"})})]})})]})})]}),"\n",s(e.p,{children:["같은 규칙이 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"Cloneable.clone"})})})}),", ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"Serializable.readObject"})})})}),"에도 적용된다. 두 메서드 모두 사실상 새 객체를 만들어 내는 생성자처럼 동작하므로, 재정의 가능한 메서드를 직접 또는 간접적으로 호출하면 같은 함정에 빠진다."]}),"\n",h(l,{title:"상속용 클래스 자가 검증 체크리스트",children:s(e.ul,{children:["\n",s(e.li,{children:["재정의 가능 메서드의 자기 사용 패턴을 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"@implSpec"})})})}),"으로 문서화했는가"]}),"\n",s(e.li,{children:[h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"protected"})})})})," 훅을 정말 필요한 곳에만 신중히 노출했는가"]}),"\n",h(e.li,{children:"하위 클래스를 최소 세 개 만들어 가정을 깼는가"}),"\n",s(e.li,{children:["생성자, ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"clone"})})})}),", ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"readObject"})})})}),"에서 재정의 가능 메서드를 호출하지 않는가"]}),"\n"]})}),"\n",h(e.h2,{id:"인터페이스-우선",children:"인터페이스 우선"}),"\n",s(e.p,{children:["자바에는 다중 구현 메커니즘이 두 가지 있다. ",h(a,{children:"추상 클래스"}),"와 ",h(a,{children:"인터페이스"}),"다. 자바 8부터 인터페이스도 디폴트 메서드를 가질 수 있게 되면서, 둘 다 ",h(a,{children:"인스턴스 메서드의 구현을 제공할 수 있다"}),"는 점에서 비슷해 보인다. 그러나 큰 차이가 있다. 추상 클래스를 구현하려면 그 추상 클래스를 단일 조상으로 두어야 한다. 자바는 단일 상속만 허용하므로, 한 클래스가 가질 수 있는 추상 조상은 하나뿐이다."]}),"\n",s(e.p,{children:["반면 인터페이스는 여러 개를 동시에 구현할 수 있다. 인터페이스는 ",h(a,{children:"믹스인(mixin) 타입"}),"으로 동작하며, 주된 타입 외에 선택적 행위를 추가로 선언하는 효과를 준다. ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"Comparable"})})})}),"은 자신을 구현한 클래스의 인스턴스들끼리 순서를 정할 수 있음을 의미하고, ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"AutoCloseable"})})})}),"은 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"try-with-resources"})})})}),"에 들어갈 수 있음을 의미한다."]}),"\n",s(e.p,{children:["같은 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"Order"})})})}),"라도 도메인에 따라 조합이 달라진다. 가격순으로 정렬해야 하면 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"Comparable"})})})}),"를 구현하고, JSON 직렬화 대상이면 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"Serializable"})})})}),"을 추가하는 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*"}),h(e.span,{style:{"--shiki-atom-light":"#383A42","--shiki-atom-dark":"#ABB2BF","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#393A34","--shiki-vitesse-dark":"#DBD7CAEE"},children:" quantity"}),h(e.span,{style:{"--shiki-atom-light":"#383A42","--shiki-atom-dark":"#ABB2BF","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#999999","--shiki-vitesse-dark":"#666666"},children:","}),h(e.span,{style:{"--shiki-atom-light":"#E45649","--shiki-atom-dark":"#E5C07B","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#B07D48","--shiki-vitesse-dark":"#BD976A"},children:" unitPrice"}),h(e.span,{style:{"--shiki-atom-light":"#383A42","--shiki-atom-dark":"#ABB2BF","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#999999","--shiki-vitesse-dark":"#666666"},children:"."}),h(e.span,{style:{"--shiki-atom-light":"#4078F2","--shiki-atom-dark":"#61AFEF","--shiki-github-light":"#6F42C1","--shiki-github-dark":"#B392F0","--shiki-vitesse-light":"#59873A","--shiki-vitesse-dark":"#80A665"},children:"currency"}),h(e.span,{style:{"--shiki-atom-light":"#383A42","--shiki-atom-dark":"#ABB2BF","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#999999","--shiki-vitesse-dark":"#666666"},children:"());"})]}),"\n",h(e.span,{"data-line":"",children:h(e.span,{style:{"--shiki-atom-light":"#383A42","--shiki-atom-dark":"#ABB2BF","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#999999","--shiki-vitesse-dark":"#666666"},children:" }"})}),"\n",h(e.span,{"data-line":"",children:h(e.span,{style:{"--shiki-atom-light":"#383A42","--shiki-atom-dark":"#ABB2BF","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#999999","--shiki-vitesse-dark":"#666666"},children:"}"})})]})})]}),"\n",s(e.p,{children:[h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"LineItem"})})})}),"은 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"price()"})})})}),"만 구현하면 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"discounted(int)"})})})}),"를 자동으로 얻는다. 추상 클래스로 같은 일을 하려면 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"LineItem"})})})}),"이 단일 추상 조상에 묶여야 했고, 다른 행위를 더 끼우기가 어려웠을 것이다."]}),"\n",s(e.p,{children:["다만 디폴트 메서드는 만능이 아니다. ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"equals"})})})}),", ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"hashCode"})})})}),", ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"toString"})})})})," 같은 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"Object"})})})})," 메서드는 디폴트 메서드로 제공할 수 없고, 인터페이스에는 인스턴스 필드를 둘 수 없다. 추상 클래스가 더 자연스러운 자리도 분명히 있다. 그래서 표준 라이브러리는 자주 ",h(a,{children:"인터페이스 + 골격 구현체(skeletal implementation)"})," 쌍으로 제공한다. ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"Collection"})})})}),", ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"List"})})})}),", ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"Set"})})})})," 같은 인터페이스 옆에 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"AbstractCollection"})})})}),", ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"AbstractList"})})})}),", ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"AbstractSet"})})})}),"이 함께 있는 이유다."]}),"\n",h(k,{type:"info",title:"선택 기준 한 줄",children:h(e.p,{children:"다중 구현이나 믹스인 의도가 있다면 인터페이스, 공통 상태와 골격 구현이 핵심이면 추상 클래스. 둘 다 필요하면 인터페이스와 골격 구현체를 함께 제공한다."})}),"\n",h(e.h2,{id:"태그-대신-계층",children:"태그 대신 계층"}),"\n",s(e.p,{children:["태그 달린 클래스는 한 클래스 안에 두 가지 이상의 의미를 섞어 놓고, ",h(a,{children:"태그 필드"}),"와 분기로 구분하는 패턴이다. 도형을 예로 들면, 원과 사각형을 한 클래스에 담고 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"Type.CIRCLE"})})})})," 또는 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"Type.RECTANGLE"})})})})," 태그로 구분하는 식이다."]}),"\n",h(e.p,{children:"코드는 분기로 가득 차고, 사용하지 않는 필드까지 모든 인스턴스가 함께 들고 다닌다. 메모리 효율이 떨어지고, 의미 없는 필드가 객체에 섞여 있어 가독성도 함께 무너진다. 새 도형을 추가하려면 태그 enum, 분기, 생성자, 메서드 모두에 손을 대야 한다."}),"\n",s(r,{group:"tagged-vs-hierarchy",children:[h(g,{label:"Before: 태그 달린 클래스",children:s(e.figure,{"data-rehype-pretty-code-figure":"",children:[s(e.figcaption,{"data-rehype-pretty-code-title":"","data-language":"java","data-theme":"one-light 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class"}),h(e.span,{style:{"--shiki-atom-light":"#C18401","--shiki-atom-dark":"#E5C07B","--shiki-github-light":"#6F42C1","--shiki-github-dark":"#B392F0","--shiki-vitesse-light":"#2E8F82","--shiki-vitesse-dark":"#5DA994"},children:" Shape"}),h(e.span,{style:{"--shiki-atom-light":"#383A42","--shiki-atom-dark":"#ABB2BF","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#999999","--shiki-vitesse-dark":"#666666"},children:" {"})]}),"\n",s(e.span,{"data-line":"",children:[h(e.span,{style:{"--shiki-atom-light":"#A626A4","--shiki-atom-dark":"#C678DD","--shiki-github-light":"#D73A49","--shiki-github-dark":"#F97583","--shiki-vitesse-light":"#AB5959","--shiki-vitesse-dark":"#CB7676"},children:" enum"}),h(e.span,{style:{"--shiki-atom-light":"#C18401","--shiki-atom-dark":"#E5C07B","--shiki-github-light":"#6F42C1","--shiki-github-dark":"#B392F0","--shiki-vitesse-light":"#2E8F82","--shiki-vitesse-dark":"#5DA994"},children:" Type"}),h(e.span,{style:{"--shiki-atom-light":"#383A42","--shiki-atom-dark":"#E06C75","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#999999","--shiki-vitesse-dark":"#666666"},children:" {"}),h(e.span,{style:{"--shiki-atom-light":"#986801","--shiki-atom-dark":"#D19A66","--shiki-github-light":"#005CC5","--shiki-github-dark":"#79B8FF","--shiki-vitesse-light":"#A65E2B","--shiki-vitesse-dark":"#C99076"},children:" CIRCLE"}),h(e.span,{style:{"--shiki-atom-light":"#383A42","--shiki-atom-dark":"#ABB2BF","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#999999","--shiki-vitesse-dark":"#666666"},children:","}),h(e.span,{style:{"--shiki-atom-light":"#986801","--shiki-atom-dark":"#D19A66","--shiki-github-light":"#005CC5","--shiki-github-dark":"#79B8FF","--shiki-vitesse-light":"#A65E2B","--shiki-vitesse-dark":"#C99076"},children:" RECTANGLE"}),h(e.span,{style:{"--shiki-atom-light":"#383A42","--shiki-atom-dark":"#E06C75","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#999999","--shiki-vitesse-dark":"#666666"},children:" }"})]}),"\n",h(e.span,{"data-line":"",children:" "}),"\n",s(e.span,{"data-line":"",children:[h(e.span,{style:{"--shiki-atom-light":"#A626A4","--shiki-atom-dark":"#C678DD","--shiki-github-light":"#D73A49","--shiki-github-dark":"#F97583","--shiki-vitesse-light":"#AB5959","--shiki-vitesse-dark":"#CB7676"},children:" private"}),h(e.span,{style:{"--shiki-atom-light":"#A626A4","--shiki-atom-dark":"#C678DD","--shiki-github-light":"#D73A49","--shiki-github-dark":"#F97583","--shiki-vitesse-light":"#AB5959","--shiki-vitesse-dark":"#CB7676"},children:" final"}),h(e.span,{style:{"--shiki-atom-light":"#C18401","--shiki-atom-dark":"#E5C07B","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#393A34","--shiki-vitesse-dark":"#DBD7CAEE"},children:" Type"}),h(e.span,{style:{"--shiki-atom-light":"#E45649","--shiki-atom-dark":"#E06C75","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#B07D48","--shiki-vitesse-dark":"#BD976A"},children:" type"}),h(e.span,{style:{"--shiki-atom-light":"#383A42","--shiki-atom-dark":"#ABB2BF","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#999999","--shiki-vitesse-dark":"#666666"},children:";"})]}),"\n",h(e.span,{"data-line":"",children:" "}),"\n",h(e.span,{"data-line":"",children:h(e.span,{style:{"--shiki-atom-light":"#A0A1A7","--shiki-atom-light-font-style":"italic","--shiki-atom-dark":"#7F848E","--shiki-atom-dark-font-style":"italic","--shiki-github-light":"#6A737D","--shiki-github-light-font-style":"inherit","--shiki-github-dark":"#6A737D","--shiki-github-dark-font-style":"inherit","--shiki-vitesse-light":"#A0ADA0","--shiki-vitesse-light-font-style":"inherit","--shiki-vitesse-dark":"#758575DD","--shiki-vitesse-dark-font-style":"inherit"},children:" // 사각형일 때만 사용"})}),"\n",s(e.span,{"data-line":"",children:[h(e.span,{style:{"--shiki-atom-light":"#A626A4","--shiki-atom-dark":"#C678DD","--shiki-github-light":"#D73A49","--shiki-github-dark":"#F97583","--shiki-vitesse-light":"#AB5959","--shiki-vitesse-dark":"#CB7676"},children:" private"}),h(e.span,{style:{"--shiki-atom-light":"#A626A4","--shiki-atom-dark":"#C678DD","--shiki-github-light":"#D73A49","--shiki-github-dark":"#F97583","--shiki-vitesse-light":"#AB5959","--shiki-vitesse-dark":"#CB7676"},children:" double"}),h(e.span,{style:{"--shiki-atom-light":"#E45649","--shiki-atom-dark":"#E06C75","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#B07D48","--shiki-vitesse-dark":"#BD976A"},children:" length"}),h(e.span,{style:{"--shiki-atom-light":"#383A42","--shiki-atom-dark":"#ABB2BF","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#999999","--shiki-vitesse-dark":"#666666"},children:";"})]}),"\n",s(e.span,{"data-line":"",children:[h(e.span,{style:{"--shiki-atom-light":"#A626A4","--shiki-atom-dark":"#C678DD","--shiki-github-light":"#D73A49","--shiki-github-dark":"#F97583","--shiki-vitesse-light":"#AB5959","--shiki-vitesse-dark":"#CB7676"},children:" private"}),h(e.span,{style:{"--shiki-atom-light":"#A626A4","--shiki-atom-dark":"#C678DD","--shiki-github-light":"#D73A49","--shiki-github-dark":"#F97583","--shiki-vitesse-light":"#AB5959","--shiki-vitesse-dark":"#CB7676"},children:" double"}),h(e.span,{style:{"--shiki-atom-light":"#E45649","--shiki-atom-dark":"#E06C75","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#B07D48","--shiki-vitesse-dark":"#BD976A"},children:" width"}),h(e.span,{style:{"--shiki-atom-light":"#383A42","--shiki-atom-dark":"#ABB2BF","--shiki-github-light":"#24292E","--shiki-github-dark":"#E1E4E8","--shiki-vitesse-light":"#999999","--shiki-vitesse-dark":"#666666"},children:";"})]}),"\n",h(e.span,{"data-line":"",children:" 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",h(a,{children:"계층 구조를 흉내 낸 어색한 시도"}),"로 봐도 좋다. 태그 필드와 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"switch"})})})}),"가 보이면 거의 항상 클래스 계층으로 풀 수 있는지 먼저 점검한다."]}),"\n",h(e.h2,{id:"정적-멤버-클래스",children:"정적 멤버 클래스"}),"\n",s(e.p,{children:["자바의 중첩 클래스는 네 종류다. ",h(a,{children:"정적 멤버 클래스"}),", ",h(a,{children:"비정적 멤버 클래스"}),", ",h(a,{children:"익명 클래스"}),", ",h(a,{children:"지역 클래스"}),". 이 절은 앞의 두 종류 사이의 선택만 다룬다."]}),"\n",s(e.p,{children:["비정적 멤버 클래스의 인스턴스는 암묵적으로 바깥 클래스 인스턴스와 연결된다. 그래서 비정적 멤버 클래스 안에서 ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"OuterClass.this"})})})}),"로 바깥 인스턴스를 참조할 수 있다. 이 연결 정보가 인스턴스 안에 만들어지므로 메모리를 더 차지하고 생성 시간도 더 든다."]}),"\n",s(e.p,{children:["더 위험한 건 ",h(a,{children:"숨은 외부 참조"}),"다. ",h(e.span,{"data-rehype-pretty-code-figure":"",children:h(e.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(e.span,{"data-line":"",children:h(e.span,{children:"static"})})})}),"을 빠뜨린 멤버 클래스는 자신이 명시적으로 외부를 참조하지 않더라도 바깥 인스턴스로의 참조를 항상 들고 있다. 멤버 클래스 인스턴스가 어디선가 살아 있는 한 바깥 인스턴스도 가비지 컬렉터가 회수하지 못한다. ",h(a,{children:"의도하지 않은 메모리 누수"}),"가 자주 여기서 시작된다."]}),"\n",s(e.p,{children:["원칙은 단순하다. ",s(a,{children:["멤버 클래스에서 바깥 인스턴스에 접근할 일이 없다면 반드시 ",h(e.code,{children:"static"}),"을 붙인다."]})," 바깥 인스턴스에 접근해야 할 정당한 이유가 있을 때만 비정적 멤버 클래스로 둔다. 어댑터(adapter) 구현이 그런 자리의 대표 사례다."]}),"\n",s(r,{group:"static-member-class",children:[h(g,{label:"Before: 비정적 멤버 클래스 — 외부 참조 불필요",children:s(e.figure,{"data-rehype-pretty-code-figure":"",children:[s(e.figcaption,{"data-rehype-pretty-code-title":"","data-language":"java","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:[h(e.span,{className:"code-lang-icon","data-lang":"java","data-len":"4","aria-hidden":"true",children:"JAVA"}),"Order.java"]}),h(e.pre,{tabIndex:"0","data-language":"java","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:s(e.code,{"data-language":"java","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light 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