{"id":53599,"date":"2019-12-05T00:00:00","date_gmt":"2019-12-04T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/samyj-populyarnyj-primer-java-koda-na-stackoverflow-okazalsya-s-oshibkoj"},"modified":"2020-02-18T14:01:31","modified_gmt":"2020-02-18T11:01:31","slug":"samyj-populyarnyj-primer-java-koda-na-stackoverflow-okazalsya-s-oshibkoj","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/samyj-populyarnyj-primer-java-koda-na-stackoverflow-okazalsya-s-oshibkoj","title":{"rendered":"Najpopularniejszy przyk\u0142ad kodu Java na StackOverflow okaza\u0142 si\u0119 b\u0142\u0119dny","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Najbardziej popularny <noindex><a rel=\"nofollow\" href=\"https:\/\/stackoverflow.com\/questions\/3758606\/how-to-convert-byte-size-into-human-readable-format-in-java\/3758880#3758880\">przyk\u0142ad kodu Java<\/a><\/noindex>, opublikowanego na StackOverflow, <noindex><a rel=\"nofollow\" href=\"https:\/\/programming.guide\/worlds-most-copied-so-snippet.html\">okaza\u0142 si\u0119<\/a><\/noindex> z b\u0142\u0119dem, prowadz\u0105cym do wy\u015bwietlenia w okre\u015blonych warunkach nieprawid\u0142owego wyniku. Rozwa\u017cany kod zosta\u0142 umieszczony w 2010 roku i zyska\u0142 ponad tysi\u0105c rekomendacji, a tak\u017ce zosta\u0142 <noindex><a rel=\"nofollow\" href=\"https:\/\/arxiv.org\/pdf\/1802.02938.pdf\">skopiowany<\/a><\/noindex> do wielu projekt\u00f3w i spotyka si\u0119 w repozytoriach na GitHubie oko\u0142o 7 tysi\u0119cy razy. Co ciekawe, b\u0142\u0105d odkry\u0142 nie u\u017cytkownik kopiuj\u0105cy ten kod do swoich projekt\u00f3w, lecz pierwotny autor rady.<\/p>\n<p>Rozwa\u017cany kod przeprowadza\u0142 konwersj\u0119 rozmiaru w bajtach na form\u0119 czyteln\u0105, na przyk\u0142ad 110592 zamienia\u0142 na &#171;110.6 kB&#187; lub &#171;108.0 KiB&#187;. Kod zosta\u0142 zaproponowany jako optymalizowana wersja wcze\u015bniejszej rady, w kt\u00f3rej warto\u015b\u0107 by\u0142a okre\u015blana na podstawie iteracyjnego dzielenia warto\u015bci pocz\u0105tkowej w p\u0119tli przez 1018, 1015, 1012, 1019,<br \/>\n106, 103 i 100, a\u017c dzielnik by\u0142 wi\u0119kszy od pocz\u0105tkowej warto\u015bci w bajtach. Z powodu niedok\u0142adnych oblicze\u0144 w wersji optymalizowanej (przepe\u0142nienie warto\u015bci long) wynik dzia\u0142ania przy przetwarzaniu bardzo du\u017cych liczb (eksabajt\u00f3w) nie odpowiada\u0142 rzeczywisto\u015bci. <\/p>\n<p>Autor rady r\u00f3wnie\u017c stara\u0142 si\u0119 zwr\u00f3ci\u0107 uwag\u0119 na problem kopiowania przyk\u0142ad\u00f3w bez odniesienia do \u017ar\u00f3d\u0142a i bez wskazania licencji. Z danych wcze\u015bniej <noindex><a rel=\"nofollow\" href=\"https:\/\/empirical-software.engineering\/assets\/pdf\/icse19-snippets-slides.pdf\">przeprowadzonego badania<\/a><\/noindex> 46% programist\u00f3w skopiowa\u0142o kod ze StackOverflow bez podawania autora, 75% nie wiedzia\u0142o, \u017ce kod jest obj\u0119ty licencj\u0105 CC BY-SA, a 67% nie zdawa\u0142o sobie sprawy, co to oznacza w kontek\u015bcie obowi\u0105zku wskazywania autorstwa.<\/p>\n<p>Wed\u0142ug <noindex><a rel=\"nofollow\" href=\"https:\/\/arxiv.org\/pdf\/1910.01321.pdf\">danych<\/a><\/noindex> innego badania, kopiowanie przyk\u0142ad\u00f3w kodu wi\u0105\u017ce si\u0119 nie tylko z ryzykiem wyst\u0105pienia b\u0142\u0119d\u00f3w w kodzie, ale i luk bezpiecze\u0144stwa. Na przyk\u0142ad, analizuj\u0105c 72483 przyk\u0142ad\u00f3w kodu na C++ na StackOverflow, badacze zidentyfikowali powa\u017cne luki w 69 przyk\u0142adach (co stanowi 0,09%), kt\u00f3re znajduj\u0105 si\u0119 na li\u015bcie najbardziej popularnych rekomendacji. Nast\u0119pnie, analizuj\u0105c obecno\u015b\u0107 tego kodu na GitHubie, stwierdzono, \u017ce skopiowany z StackOverflow podatny kod wyst\u0119puje w 2859 projektach.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>\u0179r\u00f3d\u0142o: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51982\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0421\u0430\u043c\u044b\u0439 \u043f\u043e\u043f\u0443\u043b\u044f\u0440\u043d\u044b\u0439 \u043f\u0440\u0438\u043c\u0435\u0440 Java-\u043a\u043e\u0434\u0430, \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e \u043d\u0430 StackOverflow, \u043e\u043a\u0430\u0437\u0430\u043b\u0441\u044f \u0441 \u043e\u0448\u0438\u0431\u043a\u043e\u0439, \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0435\u0439 \u043a \u0432\u044b\u0432\u043e\u0434\u0443 \u043f\u0440\u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 \u0443\u0441\u043b\u043e\u0432\u0438\u044f\u0445 \u043d\u0435\u0432\u0435\u0440\u043d\u043e\u0433\u043e \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0430. \u0420\u0430\u0441\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u0435\u043c\u044b\u0439 \u043a\u043e\u0434 \u0431\u044b\u043b \u0440\u0430\u0437\u043c\u0435\u0449\u0451\u043d \u0432 2010 \u0433\u043e\u0434\u0443 \u0438 \u043d\u0430\u043a\u043e\u043f\u0438\u043b \u0431\u043e\u043b\u0435\u0435 \u0442\u044b\u0441\u044f\u0447\u0438 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0430\u0446\u0438\u0439, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0431\u044b\u043b \u0441\u043a\u043e\u043f\u0438\u0440\u043e\u0432\u0430\u043d \u0432\u043e \u043c\u043d\u043e\u0433\u0438\u0435 \u043f\u0440\u043e\u0435\u043a\u0442\u044b \u0438 \u0432\u0441\u0442\u0440\u0435\u0447\u0430\u0435\u0442\u0441\u044f \u0432 \u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u044f\u0445 \u043d\u0430 GitHub \u043e\u043a\u043e\u043b\u043e 7 \u0442\u044b\u0441\u044f\u0447 \u0440\u0430\u0437. \u041f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u044c\u043d\u043e, \u0447\u0442\u043e \u043e\u0448\u0438\u0431\u043a\u0443 \u043d\u0430\u0448\u043b\u0438 \u043d\u0435 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0438, \u043a\u043e\u043f\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0434\u0430\u043d\u043d\u044b\u0439 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-53599","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com 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