{"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\/da\/blog\/news\/samyj-populyarnyj-primer-java-koda-na-stackoverflow-okazalsya-s-oshibkoj","title":{"rendered":"Det mest popul\u00e6re Java-kodeeksempel p\u00e5 StackOverflow viste sig at have en fejl","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Det mest popul\u00e6re <noindex><a rel=\"nofollow\" href=\"https:\/\/stackoverflow.com\/questions\/3758606\/how-to-convert-byte-size-into-human-readable-format-in-java\/3758880#3758880\">Java-kodeeksempel<\/a><\/noindex>, offentliggjort p\u00e5 StackOverflow, <noindex><a rel=\"nofollow\" href=\"https:\/\/programming.guide\/worlds-most-copied-so-snippet.html\">vist sig<\/a><\/noindex> at have en fejl, der f\u00f8rer til, at der under bestemte betingelser vises et forkert resultat. Den p\u00e5g\u00e6ldende kode blev offentliggjort i 2010 og har f\u00e5et over tusinde anbefalinger samt er <noindex><a rel=\"nofollow\" href=\"https:\/\/arxiv.org\/pdf\/1802.02938.pdf\">kopieret<\/a><\/noindex> til mange projekter og findes i repositories p\u00e5 GitHub omkring 7.000 gange. Det er bem\u00e6rkelsesv\u00e6rdigt, at fejlen ikke blev opdaget af brugerne, der kopierede denne kode til deres projekter, men af den oprindelige forfatter af r\u00e5det.<\/p>\n<p>Den betragtede kode omdannede byte-st\u00f8rrelser til en l\u00e6sbar form, for eksempel omdannede 110592 til &#171;110.6 kB&#187; eller &#171;108.0 KiB&#187;. Koden blev foresl\u00e5et som optimeret ved hj\u00e6lp af logaritmer, en variant af det tidligere foresl\u00e5ede r\u00e5d, hvor st\u00f8rrelsen blev bestemt ved sekventiel deling af den oprindelige v\u00e6rdi i en loop med 1018, 1015, 1012, 1019,<br \/>\n106, 103 og 100, indtil deleren var st\u00f8rre end den oprindelige v\u00e6rdi i bytes. P\u00e5 grund af un\u00f8jagtige beregninger i den optimerede version (overl\u00f8b af long-v\u00e6rdien) svarede resultatet ved behandling af meget store tal (exabyte) ikke til virkeligheden. <\/p>\n<p>R\u00e5dgiveren fors\u00f8gte ogs\u00e5 at g\u00f8re opm\u00e6rksom p\u00e5 problemet med at kopiere eksempler uden at angive kilden og uden at angive licens. If\u00f8lge tidligere <noindex><a rel=\"nofollow\" href=\"https:\/\/empirical-software.engineering\/assets\/pdf\/icse19-snippets-slides.pdf\">gennemf\u00f8rte unders\u00f8gelser<\/a><\/noindex> kopierede 46% af udviklerne koden fra StackOverflow uden at angive forfatteren, 75% vidste ikke, at koden blev udgivet under CC BY-SA-licensen, og 67% vidste ikke, at dette medf\u00f8rte, at forfatterskabet skulle angives.<\/p>\n<p>If\u00f8lge <noindex><a rel=\"nofollow\" href=\"https:\/\/arxiv.org\/pdf\/1910.01321.pdf\">data<\/a><\/noindex> if\u00f8lge en anden unders\u00f8gelse er kopiering af kodeeksempler ikke kun forbundet med risikoen for fejl i koden, men ogs\u00e5 for s\u00e5rbarheder. For eksempel, ved at analysere 72483 kodeeksempler p\u00e5 C++ p\u00e5 StackOverflow, afsl\u00f8rede forskerne alvorlige s\u00e5rbarheder i 69 eksempler (hvilket udg\u00f8r 0,09%), der er blandt de mest popul\u00e6re anbefalinger. Efter at have analyseret findes af denne kode p\u00e5 GitHub, blev det afsl\u00f8ret, at s\u00e5rbar kode kopieret fra StackOverflow er til stede i 2859 projekter.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Kilde: <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 5.0.3 - aioseo.com -->\n\t<meta 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