{"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\/it\/blog\/news\/samyj-populyarnyj-primer-java-koda-na-stackoverflow-okazalsya-s-oshibkoj","title":{"rendered":"Il esempio di codice Java pi\u00f9 popolare su StackOverflow si \u00e8 rivelato con un errore.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Il pi\u00f9 popolare <noindex><a rel=\"nofollow\" href=\"https:\/\/stackoverflow.com\/questions\/3758606\/how-to-convert-byte-size-into-human-readable-format-in-java\/3758880#3758880\">esempio di codice Java<\/a><\/noindex>, pubblicato su StackOverflow, <noindex><a rel=\"nofollow\" href=\"https:\/\/programming.guide\/worlds-most-copied-so-snippet.html\">si \u00e8 rivelato<\/a><\/noindex> con un errore che porta a risultati errati sotto determinate condizioni. Il codice in questione \u00e8 stato pubblicato nel 2010 e ha accumulato oltre mille raccomandazioni, ed \u00e8 stato <noindex><a rel=\"nofollow\" href=\"https:\/\/arxiv.org\/pdf\/1802.02938.pdf\">copia<\/a><\/noindex> in molti progetti e appare in repository su GitHub circa 7.000 volte. \u00c8 notevole che l'errore non sia stato trovato dagli utenti che copiano questo codice nei loro progetti, ma dall'autore originale del consiglio.<\/p>\n<p>Il codice in questione convertiva le dimensioni in byte in un formato leggibile, ad esempio 110592 veniva trasformato in \u00ab110,6 kB\u00bb o \u00ab108,0 KiB\u00bb. Il codice \u00e8 stato proposto come un'ottimizzazione tramite logaritmi rispetto a un precedente consiglio, in cui il valore era determinato mediante una divisione sequenziale del valore iniziale in un ciclo per 1018, 1015, 1012, 1019,<br \/>\n10^6, 10^3 e 10^0, fino a quando il divisore \u00e8 maggiore del valore originale in byte. A causa di calcoli imprecisi nella versione ottimizzata (overflow del valore long) il risultato elaborato per numeri molto grandi (exabyte) non era accurato. <\/p>\n<p>L'autore del consiglio ha anche cercato di richiamare l'attenzione sul problema della copia degli esempi senza citare la fonte e senza specificare la licenza. Secondo una ricerca precedentemente <noindex><a rel=\"nofollow\" href=\"https:\/\/empirical-software.engineering\/assets\/pdf\/icse19-snippets-slides.pdf\">condotta,<\/a><\/noindex> il 46% degli sviluppatori ha copiato codice da StackOverflow senza citare l'autore, il 75% non sapeva che il codice fosse distribuito sotto la licenza CC BY-SA, e il 67% non sapeva che ci\u00f2 comportasse la necessit\u00e0 di attribuire il credito.<\/p>\n<p>Secondo <noindex><a rel=\"nofollow\" href=\"https:\/\/arxiv.org\/pdf\/1910.01321.pdf\">i dati<\/a><\/noindex> Un'altra ricerca ha rivelato che copiare esempi di codice comporta non solo il rischio di errori nel codice, ma anche vulnerabilit\u00e0. Ad esempio, analizzando 72.483 esempi di codice su StackOverflow in C++, i ricercatori hanno identificato serie vulnerabilit\u00e0 in 69 esempi (pari allo 0,09%), inclusi nella lista delle raccomandazioni pi\u00f9 popolari. Analizzando poi la presenza di questo codice su GitHub, \u00e8 emerso che il codice vulnerabile copiato da StackOverflow \u00e8 presente in 2.859 progetti.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <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 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\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 5.0.0.1 - aioseo.com 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