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class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Inhoud</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">naar zijbalk verplaatsen</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">verbergen</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Top</div> </a> </li> <li id="toc-Soorten_overerving" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Soorten_overerving"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Soorten overerving</span> </div> </a> <ul id="toc-Soorten_overerving-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Voorbeeld" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Voorbeeld"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Voorbeeld</span> </div> </a> <ul id="toc-Voorbeeld-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Inhoud" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Inhoudsopgave omschakelen" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Inhoudsopgave omschakelen</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Overerving (informatica)</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" 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Beschikbaar in 38 talen" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-38" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">38 talen</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%88%D8%B1%D8%A7%D8%AB%D8%A9_(%D8%AD%D9%88%D8%B3%D8%A8%D8%A9)" title="وراثة (حوسبة) – Arabisch" lang="ar" hreflang="ar" data-title="وراثة (حوسبة)" data-language-autonym="العربية" data-language-local-name="Arabisch" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/%C4%B0rsilik" title="İrsilik – Azerbeidzjaans" lang="az" hreflang="az" data-title="İrsilik" data-language-autonym="Azərbaycanca" data-language-local-name="Azerbeidzjaans" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-azb mw-list-item"><a href="https://azb.wikipedia.org/wiki/%D9%82%D8%A7%D9%84%DB%8C%D8%AA%DB%8C%D9%85_(%D8%A8%DB%8C%D9%84%DA%AF%DB%8C_%D8%B3%D8%A7%DB%8C%D8%A7%D8%B1_%D8%A8%DB%8C%D9%84%DB%8C%D9%85%DB%8C)" title="قالیتیم (بیلگی سایار بیلیمی) – South Azerbaijani" lang="azb" hreflang="azb" data-title="قالیتیم (بیلگی سایار بیلیمی)" data-language-autonym="تۆرکجه" data-language-local-name="South Azerbaijani" class="interlanguage-link-target"><span>تۆرکجه</span></a></li><li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/%D0%A1%D0%BF%D0%B0%D0%B4%D0%BA%D0%B0%D0%B2%D0%B0%D0%BD%D1%8C%D0%BD%D0%B5_(%D0%BF%D1%80%D0%B0%D0%B3%D1%80%D0%B0%D0%BC%D0%B0%D0%B2%D0%B0%D0%BD%D1%8C%D0%BD%D0%B5)" title="Спадкаваньне (праграмаваньне) – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Спадкаваньне (праграмаваньне)" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="Belarusian (Taraškievica orthography)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Naslje%C4%91ivanje_(programiranje)" title="Nasljeđivanje (programiranje) – Bosnisch" lang="bs" hreflang="bs" data-title="Nasljeđivanje (programiranje)" data-language-autonym="Bosanski" data-language-local-name="Bosnisch" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Her%C3%A8ncia_(programaci%C3%B3)" title="Herència (programació) – Catalaans" lang="ca" hreflang="ca" data-title="Herència (programació)" data-language-autonym="Català" data-language-local-name="Catalaans" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/D%C4%9Bdi%C4%8Dnost_(objektov%C4%9B_orientovan%C3%A9_programov%C3%A1n%C3%AD)" title="Dědičnost (objektově orientované programování) – Tsjechisch" lang="cs" hreflang="cs" data-title="Dědičnost (objektově orientované programování)" data-language-autonym="Čeština" data-language-local-name="Tsjechisch" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de badge-Q17437798 badge-goodarticle mw-list-item" title="goed artikel"><a href="https://de.wikipedia.org/wiki/Vererbung_(Programmierung)" title="Vererbung (Programmierung) – Duits" lang="de" hreflang="de" data-title="Vererbung (Programmierung)" data-language-autonym="Deutsch" data-language-local-name="Duits" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Inheritance_(object-oriented_programming)" title="Inheritance (object-oriented programming) – Engels" lang="en" hreflang="en" data-title="Inheritance (object-oriented programming)" data-language-autonym="English" data-language-local-name="Engels" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Herencia_(inform%C3%A1tica)" title="Herencia (informática) – Spaans" lang="es" hreflang="es" data-title="Herencia (informática)" data-language-autonym="Español" data-language-local-name="Spaans" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%88%D8%B1%D8%A7%D8%AB%D8%AA_(%D8%A8%D8%B1%D9%86%D8%A7%D9%85%D9%87%E2%80%8C%D9%86%D9%88%DB%8C%D8%B3%DB%8C_%D8%B4%DB%8C%D8%A1%DA%AF%D8%B1%D8%A7)" title="وراثت (برنامه‌نویسی شیءگرا) – Perzisch" lang="fa" hreflang="fa" data-title="وراثت (برنامه‌نویسی شیءگرا)" data-language-autonym="فارسی" data-language-local-name="Perzisch" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Perint%C3%A4_(ohjelmointi)" title="Perintä (ohjelmointi) – Fins" lang="fi" hreflang="fi" data-title="Perintä (ohjelmointi)" data-language-autonym="Suomi" data-language-local-name="Fins" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/H%C3%A9ritage_(informatique)" title="Héritage (informatique) – Frans" lang="fr" hreflang="fr" data-title="Héritage (informatique)" data-language-autonym="Français" data-language-local-name="Frans" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%99%D7%A8%D7%95%D7%A9%D7%94_(%D7%AA%D7%9B%D7%A0%D7%95%D7%AA)" title="ירושה (תכנות) – Hebreeuws" lang="he" hreflang="he" data-title="ירושה (תכנות)" data-language-autonym="עברית" data-language-local-name="Hebreeuws" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%B5%E0%A4%82%E0%A4%B6%E0%A4%BE%E0%A4%A8%E0%A5%81%E0%A4%95%E0%A5%8D%E0%A4%B0%E0%A4%AE_(%E0%A4%95%E0%A4%82%E0%A4%AA%E0%A5%8D%E0%A4%AF%E0%A5%82%E0%A4%9F%E0%A4%B0_%E0%A4%B5%E0%A4%BF%E0%A4%9C%E0%A5%8D%E0%A4%9E%E0%A4%BE%E0%A4%A8)" title="वंशानुक्रम (कंप्यूटर विज्ञान) – Hindi" lang="hi" hreflang="hi" data-title="वंशानुक्रम (कंप्यूटर विज्ञान)" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/%C3%96r%C3%B6kl%C5%91d%C3%A9s_(objektumorient%C3%A1lt_programoz%C3%A1s)" title="Öröklődés (objektumorientált programozás) – Hongaars" lang="hu" hreflang="hu" data-title="Öröklődés (objektumorientált programozás)" data-language-autonym="Magyar" data-language-local-name="Hongaars" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%BA%D5%A1%D5%BC%D5%A1%D5%B6%D5%A3%D5%B8%D6%82%D5%B4_(%D5%AE%D6%80%D5%A1%D5%A3%D6%80%D5%A1%D5%BE%D5%B8%D6%80%D5%B8%D6%82%D5%B4)" title="Ժառանգում (ծրագրավորում) – Armeens" lang="hy" hreflang="hy" data-title="Ժառանգում (ծրագրավորում)" data-language-autonym="Հայերեն" data-language-local-name="Armeens" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/Erf%C3%B0ir_(forritun)" title="Erfðir (forritun) – IJslands" lang="is" hreflang="is" data-title="Erfðir (forritun)" data-language-autonym="Íslenska" data-language-local-name="IJslands" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Ereditariet%C3%A0_(informatica)" title="Ereditarietà (informatica) – Italiaans" lang="it" hreflang="it" data-title="Ereditarietà (informatica)" data-language-autonym="Italiano" data-language-local-name="Italiaans" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E7%B6%99%E6%89%BF_(%E3%83%97%E3%83%AD%E3%82%B0%E3%83%A9%E3%83%9F%E3%83%B3%E3%82%B0)" title="継承 (プログラミング) – Japans" lang="ja" hreflang="ja" data-title="継承 (プログラミング)" data-language-autonym="日本語" data-language-local-name="Japans" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%9B%E1%83%94%E1%83%9B%E1%83%99%E1%83%95%E1%83%98%E1%83%93%E1%83%A0%E1%83%94%E1%83%9D%E1%83%91%E1%83%90_(%E1%83%9E%E1%83%A0%E1%83%9D%E1%83%92%E1%83%A0%E1%83%90%E1%83%9B%E1%83%98%E1%83%A0%E1%83%94%E1%83%91%E1%83%90)" title="მემკვიდრეობა (პროგრამირება) – Georgisch" lang="ka" hreflang="ka" data-title="მემკვიდრეობა (პროგრამირება)" data-language-autonym="ქართული" data-language-local-name="Georgisch" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%83%81%EC%86%8D_(%EA%B0%9D%EC%B2%B4_%EC%A7%80%ED%96%A5_%ED%94%84%EB%A1%9C%EA%B7%B8%EB%9E%98%EB%B0%8D)" title="상속 (객체 지향 프로그래밍) – Koreaans" lang="ko" hreflang="ko" data-title="상속 (객체 지향 프로그래밍)" data-language-autonym="한국어" data-language-local-name="Koreaans" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Paveld%C4%97jimas_(programavimas)" title="Paveldėjimas (programavimas) – Litouws" lang="lt" hreflang="lt" data-title="Paveldėjimas (programavimas)" data-language-autonym="Lietuvių" data-language-local-name="Litouws" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-ltg mw-list-item"><a href="https://ltg.wikipedia.org/wiki/B%C4%93rnaklase" title="Bērnaklase – Letgaals" lang="ltg" hreflang="ltg" data-title="Bērnaklase" data-language-autonym="Latgaļu" data-language-local-name="Letgaals" class="interlanguage-link-target"><span>Latgaļu</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Pewarisan_(pengaturcaraan_berorientasi_objek)" title="Pewarisan (pengaturcaraan berorientasi objek) – Maleis" lang="ms" hreflang="ms" data-title="Pewarisan (pengaturcaraan berorientasi objek)" data-language-autonym="Bahasa Melayu" data-language-local-name="Maleis" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Arv_i_programmering" title="Arv i programmering – Noors - Nynorsk" lang="nn" hreflang="nn" data-title="Arv i programmering" data-language-autonym="Norsk nynorsk" data-language-local-name="Noors - Nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Dziedziczenie_(programowanie)" title="Dziedziczenie (programowanie) – Pools" lang="pl" hreflang="pl" data-title="Dziedziczenie (programowanie)" data-language-autonym="Polski" data-language-local-name="Pools" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Heran%C3%A7a_(programa%C3%A7%C3%A3o_orientada_a_objetos)" title="Herança (programação orientada a objetos) – Portugees" lang="pt" hreflang="pt" data-title="Herança (programação orientada a objetos)" data-language-autonym="Português" data-language-local-name="Portugees" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9D%D0%B0%D1%81%D0%BB%D0%B5%D0%B4%D0%BE%D0%B2%D0%B0%D0%BD%D0%B8%D0%B5_(%D0%BF%D1%80%D0%BE%D0%B3%D1%80%D0%B0%D0%BC%D0%BC%D0%B8%D1%80%D0%BE%D0%B2%D0%B0%D0%BD%D0%B8%D0%B5)" title="Наследование (программирование) – Russisch" lang="ru" hreflang="ru" data-title="Наследование (программирование)" data-language-autonym="Русский" data-language-local-name="Russisch" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Inheritance_(object-oriented_programming)" title="Inheritance (object-oriented programming) – Simple English" lang="en-simple" hreflang="en-simple" data-title="Inheritance (object-oriented programming)" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%9D%D0%B0%D1%81%D0%BB%D0%B5%D1%92%D0%B8%D0%B2%D0%B0%D1%9A%D0%B5_(%D0%BE%D0%B1%D1%98%D0%B5%D0%BA%D1%82%D0%BD%D0%BE-%D0%BE%D1%80%D0%B8%D1%98%D0%B5%D0%BD%D1%82%D0%B8%D1%81%D0%B0%D0%BD%D0%BE_%D0%BF%D1%80%D0%BE%D0%B3%D1%80%D0%B0%D0%BC%D0%B8%D1%80%D0%B0%D1%9A%D0%B5)" title="Наслеђивање (објектно-оријентисано програмирање) – Servisch" lang="sr" hreflang="sr" data-title="Наслеђивање (објектно-оријентисано програмирање)" data-language-autonym="Српски / srpski" data-language-local-name="Servisch" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv badge-Q70893996 mw-list-item" title=""><a href="https://sv.wikipedia.org/wiki/Arv_(programmering)" title="Arv (programmering) – Zweeds" lang="sv" hreflang="sv" data-title="Arv (programmering)" data-language-autonym="Svenska" data-language-local-name="Zweeds" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%AE%E0%AE%B0%E0%AE%AA%E0%AE%BF%E0%AE%AF%E0%AE%B2%E0%AF%8D%E0%AE%AA%E0%AF%81_(%E0%AE%95%E0%AE%A3%E0%AE%BF%E0%AE%A9%E0%AE%BF%E0%AE%AF%E0%AE%BF%E0%AE%AF%E0%AE%B2%E0%AF%8D)" title="மரபியல்பு (கணினியியல்) – Tamil" lang="ta" hreflang="ta" data-title="மரபியல்பு (கணினியியல்)" data-language-autonym="தமிழ்" data-language-local-name="Tamil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Kal%C4%B1t%C4%B1m_(programlama)" title="Kalıtım (programlama) – Turks" lang="tr" hreflang="tr" data-title="Kalıtım (programlama)" data-language-autonym="Türkçe" data-language-local-name="Turks" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9D%D0%B0%D1%81%D0%BB%D1%96%D0%B4%D1%83%D0%B2%D0%B0%D0%BD%D0%BD%D1%8F_(%D0%BF%D1%80%D0%BE%D0%B3%D1%80%D0%B0%D0%BC%D1%83%D0%B2%D0%B0%D0%BD%D0%BD%D1%8F)" title="Наслідування (програмування) – Oekraïens" lang="uk" hreflang="uk" data-title="Наслідування (програмування)" data-language-autonym="Українська" data-language-local-name="Oekraïens" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a 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</div> <div id="siteSub" class="noprint">Uit Wikipedia, de vrije encyclopedie</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="nl" dir="ltr"><p><b>Overerving</b> is een term die gebruikt wordt bij de methodiek van het <a href="/wiki/Object-ori%C3%ABntatie" class="mw-redirect" title="Object-oriëntatie">object-georiënteerd programmeren</a>. Het betekent dat een <a href="/wiki/Klasse_(informatica)" title="Klasse (informatica)">klasse</a> variabelen (eigenschappen) en - afhankelijk van de definitie van de programmeertaal voor methodes - <a href="/wiki/Functie_(informatica)" class="mw-redirect" title="Functie (informatica)">functies</a> en procedures erft van een superklasse. </p> <div class="mw-heading mw-heading2"><h2 id="Soorten_overerving">Soorten overerving</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Overerving_(informatica)&veaction=edit&section=1" title="Bewerk dit kopje: Soorten overerving" class="mw-editsection-visualeditor"><span>bewerken</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Overerving_(informatica)&action=edit&section=1" title="De broncode bewerken van de sectie: Soorten overerving"><span>brontekst bewerken</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Men kan een onderscheid maken tussen "implementatie-overerving" en "blauwdrukovererving" (<i>interface inheritance</i>). Het verschil is dat bij de laatste variant alleen de definitie overgeërfd wordt, en niet de implementatie daarvan. Om objectgerichtheid, en in het bijzonder <a href="/wiki/Polymorfisme_(informatica)" title="Polymorfisme (informatica)">polymorfisme</a>, echt goed tot zijn recht te laten komen, is dat laatste van belang. In plaats van implementatie-overerving kunnen in dat geval inbedding en delegatie als alternatief toegepast worden. </p> <div class="mw-heading mw-heading2"><h2 id="Voorbeeld">Voorbeeld</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Overerving_(informatica)&veaction=edit&section=2" title="Bewerk dit kopje: Voorbeeld" class="mw-editsection-visualeditor"><span>bewerken</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Overerving_(informatica)&action=edit&section=2" title="De broncode bewerken van de sectie: Voorbeeld"><span>brontekst bewerken</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Als superklasse kan bijvoorbeeld "Dier" genomen worden. Een van de eigenschappen van een "Dier" is de vorm; de vorm wordt bepaald door de DNA-code van het dier. Bij het aanmaken van het dier wordt de DNA-code vastgelegd. De DNA-code kan bepaald worden door het afnemen van bloed: voor het gemak geeft een functie met de naam "bloed" de DNA-code van het dier. </p><p>De klasse zou er als volgt uit kunnen zien: </p> <pre>klasse Dier { constante DNAcode; constructor Dier(DNA) {DNAcode = DNA} // maakt het dier aan. methode bloed():DNAcode // geeft DNA code af door middel van bloed } </pre> <p>Dieren reageren ook op prikkels van buitenaf, dus zou aan deze <a href="/wiki/Klasse_(informatica)" title="Klasse (informatica)">klasse</a> ook een methode met de naam "prikkel" toegevoegd kunnen worden die een <a href="/wiki/Variabele_(informatica)" title="Variabele (informatica)">variabele</a> waarde van de klasse binnenkrijgt en verwerkt. </p> <pre>klasse Dier { constante DNAcode constructor Dier(DNA) {DNAcode = DNA} // maakt het dier aan. methode bloed():DNAcode // geeft DNA code af door middel van bloed methode prikkel(Prikkel) // geeft een prikkel aan het dier } </pre> <p>Door over te erven van de klasse "Dier" worden alle eigenschappen en methodes van die klasse overgenomen. Dit maakt het mogelijk om nieuwe diersoorten te maken die allemaal een DNA-code hebben en prikkels kunnen verwerken. De programmeur kan een nieuwe diersoort een unieke DNA-code geven en het op een andere manier laten reageren op een prikkel dan is voorgeschreven in de superklasse "Dier". </p><p>Een voorbeeld van een klasse die erft van "Dier" is een klasse "Zoogdier" waarvan de eigenschappen en methodes op haar beurt worden overgeërfd door een klasse "Olifant". </p> <pre>klasse Zoogdier (Dier) { variabele Geluid = 'zzzz'; constructor Zoogdier(DNA) { super(DNA) } methode maakGeluid():Geluid { return Geluid } // geeft het geluid van een Zoogdier } klasse Olifant (Zoogdier) { variabele Geluid = 'Muuuh' constructor Olifant { super('GCTTGGACCGTCGATGA') } methode stamp() // laat een Olifant stampen } </pre> <p>De "Zoogdier"-klasse neemt alle methodes en eigenschappen van "Dier" over en voegt er eigen methodes en eigenschappen aan toe. De "Olifant"-klasse overschrijft alleen de variabele "Geluid"; alle andere methodes en toegankelijke eigenschappen van de klasse neemt hij over van zijn superklasse(n). Als het geluid van een "Olifant" wordt opgevraagd wordt dus het geluid "Muuuh" teruggegeven in plaats van het standaardgeluid "zzzz". </p><p>De klasse "Dier" is hier een <a href="/w/index.php?title=Generalisatie&action=edit&redlink=1" class="new" title="Generalisatie (de pagina bestaat niet)">generalisatie</a> van "Zoogdier". De klasse "Zoogdier" is een <a href="/wiki/Specialisatie" title="Specialisatie">specialisatie</a> van "Dier". Het verschijnsel overerving wordt daarom ook wel specialisatie genoemd. </p><p>Door overerving goed toe te passen is het dus mogelijk om van alle wezens die uiteindelijk eigenschappen erven van de superklasse "Dier" de DNA-code te krijgen en ze een prikkel toe te sturen. Dit heet <a href="/wiki/Polymorfisme_(informatica)" title="Polymorfisme (informatica)">polymorfisme</a>. Bij klassen die erven van "Zoogdier" kan zelfs het geluid worden opgevraagd. </p>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1&useformat=desktop" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Overgenomen van "<a dir="ltr" href="https://nl.wikipedia.org/w/index.php?title=Overerving_(informatica)&oldid=63773185">https://nl.wikipedia.org/w/index.php?title=Overerving_(informatica)&oldid=63773185</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Categorie:Alles" title="Categorie:Alles">Categorie</a>: <ul><li><a href="/wiki/Categorie:Programmeerconcept" title="Categorie:Programmeerconcept">Programmeerconcept</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> Deze pagina is voor het laatst bewerkt op 4 feb 2023 om 12:30.</li> <li id="footer-info-copyright">De tekst is beschikbaar onder de licentie <a rel="nofollow" class="external text" href="//creativecommons.org/licenses/by-sa/4.0/deed.nl">Creative Commons Naamsvermelding/Gelijk delen</a>, er kunnen aanvullende voorwaarden van toepassing zijn. 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