const{Fragment:i,jsx:h,jsxs:s}=arguments[0];function _createMdxContent(t){const k={a:"a",code:"code",figcaption:"figcaption",figure:"figure",h2:"h2",h3:"h3",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:e,E:a,Note:l,RelatedPost:g,Tab:r,Tabs:d}=k;return e||_missingMdxReference("Callout",!0),a||_missingMdxReference("E",!0),l||_missingMdxReference("Note",!0),g||_missingMdxReference("RelatedPost",!0),r||_missingMdxReference("Tab",!0),d||_missingMdxReference("Tabs",!0),s(i,{children:[s(k.p,{children:["이펙티브 자바 3판 5장은 ",h(a,{children:"제네릭(Generics)"}),"을 다룬다. 자바 5에서 제네릭이 들어온 이유는 단순하다. 컬렉션에서 원소를 꺼낼 때마다 손으로 형변환하던 시절을 끝내고, 잘못된 타입이 들어가는 사고를 ",h(a,{children:"컴파일 시점에"})," 잡아내기 위해서다. 이 글에서는 5장에서 가장 자주 인용되는 3가지 아이템을 자바 예시 코드와 Before/After 비교로 정리한다."]}),"\n",h(l,{title:"이 글에서 다루는 3가지 아이템",children:s(k.ul,{children:["\n",h(k.li,{children:"Item 26. Raw 타입은 사용하지 말라"}),"\n",h(k.li,{children:"Item 28. 배열보다는 리스트를 사용하라"}),"\n",h(k.li,{children:"Item 31. 한정적 와일드카드를 사용해 API의 유연성을 높여라"}),"\n"]})}),"\n",s(k.p,{children:["이 글의 코드 예시는 4장과 같은 주문 도메인을 공유한다. 식별자 ",h(k.span,{"data-rehype-pretty-code-figure":"",children:h(k.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(k.span,{"data-line":"",children:h(k.span,{children:"OrderId"})})})}),", 값 객체 ",h(k.span,{"data-rehype-pretty-code-figure":"",children:h(k.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(k.span,{"data-line":"",children:h(k.span,{children:"Money"})})})}),", 라인 아이템 ",h(k.span,{"data-rehype-pretty-code-figure":"",children:h(k.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(k.span,{"data-line":"",children:h(k.span,{children:"LineItem"})})})}),". 그리고 제네릭 자체를 보여주기 위해 ",h(k.span,{"data-rehype-pretty-code-figure":"",children:h(k.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(k.span,{"data-line":"",children:h(k.span,{children:"Stack"})})})})," 같은 컬렉션 예시가 추가로 등장한다."]}),"\n",h(k.h2,{id:"raw-타입은-쓰지-않는다",children:"Raw 타입은 쓰지 않는다"}),"\n",s(k.p,{children:["클래스나 인터페이스 선언에 타입 매개변수가 등장하면 그 타입을 ",h(a,{children:"제네릭 타입(generic type)"}),"이라고 부른다. ",h(k.span,{"data-rehype-pretty-code-figure":"",children:h(k.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(k.span,{"data-line":"",children:h(k.span,{children:"List"})})})})," 인터페이스는 원소 타입을 나타내는 타입 매개변수 ",h(k.span,{"data-rehype-pretty-code-figure":"",children:h(k.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(k.span,{"data-line":"",children:h(k.span,{children:"E"})})})}),"를 받아 ",h(k.span,{"data-rehype-pretty-code-figure":"",children:h(k.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(k.span,{"data-line":"",children:h(k.span,{children:"List"})})})}),"로 선언되어 있다. 사용하는 쪽은 매개변수 자리에 실제 타입을 채워 ",h(k.span,{"data-rehype-pretty-code-figure":"",children:h(k.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(k.span,{"data-line":"",children:h(k.span,{children:"List"})})})}),"처럼 쓰는데, 이렇게 채워진 형태를 ",h(a,{children:"매개변수화 타입(parameterized type)"}),"이라고 부른다."]}),"\n",s(k.p,{children:["문제는 매개변수를 채우지 않은 형태도 여전히 사용 가능하다는 것이다. ",h(k.span,{"data-rehype-pretty-code-figure":"",children:h(k.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(k.span,{"data-line":"",children:h(k.span,{children:"List"})})})})," 그 자체. 이걸 ",h(a,{children:"Raw 타입(raw type)"}),"이라고 부르며, 자바 5 이전 코드와의 호환을 위해 남겨둔 형태다."]}),"\n",s(k.p,{children:["Raw 타입을 쓰면 컴파일러가 타입 검사를 포기한다. ",h(k.span,{"data-rehype-pretty-code-figure":"",children:h(k.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(k.span,{"data-line":"",children:h(k.span,{children:"List"})})})}),"로 선언했다면 String을 넣는 시점에 컴파일 에러로 잡히는 반면, ",h(k.span,{"data-rehype-pretty-code-figure":"",children:h(k.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(k.span,{"data-line":"",children:h(k.span,{children:"List"})})})}),"는 무엇이든 받는다. 사고는 한참 뒤에 원소를 꺼낼 때 ",h(k.span,{"data-rehype-pretty-code-figure":"",children:h(k.code,{"data-language":"plaintext","data-theme":"one-light one-dark-pro github-light github-dark vitesse-light vitesse-dark",children:h(k.span,{"data-line":"",children:h(k.span,{children:"ClassCastException"})})})}),"으로 폭발한다."]}),"\n",s(d,{group:"raw-vs-parameterized",children:[h(r,{label:"Before: Raw 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{"})]}),"\n",h(k.span,{"data-line":"",children:h(k.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:" // 매번 손으로 형변환"})}),"\n",s(k.span,{"data-line":"",children:[h(k.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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들어간다"}),h(k.span,{style:{"--shiki-atom-light":"#50A14F","--shiki-atom-dark":"#98C379","--shiki-github-light":"#032F62","--shiki-github-dark":"#9ECBFF","--shiki-vitesse-light":"#B5695977","--shiki-vitesse-dark":"#C98A7D77"},children:'"'}),h(k.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(k.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:" // 컴파일 에러 (잡힘)"})]})]})})]})})]}),"\n",h(k.p,{children:"After 쪽 매개변수화 타입은 두 가지 일을 동시에 한다."}),"\n",s(k.ul,{children:["\n",s(k.li,{children:[h(a,{children:"잘못된 타입의 원소를 컴파일러가 차단"}),"한다."]}),"\n",s(k.li,{children:["컬렉션에서 꺼내는 모든 지점에 ",h(a,{children:"보이지 않는 형변환"}),"을 컴파일러가 자동으로 삽입한다."]}),"\n"]}),"\n",h(k.p,{children:"두 번째에서 삽입되는 형변환은 컴파일러가 타입을 검증한 뒤이므로 절대 실패하지 않는다."}),"\n",h(k.h3,{id:"list와-listobject는-다르다",children:"List와 List