{"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":"L'esempio di codice Java pi\u00f9 popolare su StackOverflow si \u00e8 rivelato avere 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\">risultato<\/a><\/noindex> con un errore che porta a un risultato errato in determinate condizioni. Il codice esaminato \u00e8 stato pubblicato nel 2010 e ha accumulato pi\u00f9 di mille raccomandazioni, ed \u00e8 stato <noindex><a rel=\"nofollow\" href=\"https:\/\/arxiv.org\/pdf\/1802.02938.pdf\">copiato<\/a><\/noindex> in molti progetti ed \u00e8 presente nei repository su GitHub circa 7.000 volte. \u00c8 notevole che l'errore non sia stato trovato dagli utenti che copiavano questo codice nei loro progetti, ma dall'autore originale del consiglio.<\/p>\n<p>Il codice esaminato convertiva la dimensione in byte in una forma leggibile, ad esempio 110592 veniva trasformato in \u00ab110.6 kB\u00bb o \u00ab108.0 KiB\u00bb. Il codice \u00e8 stato proposto come ottimizzato tramite logaritmi rispetto a un consiglio precedentemente suggerito, in cui il valore era determinato sulla base della divisione sequenziale del valore iniziale in un ciclo per 1018, 1015, 1012, 1019,<br \/>\n106, 103 e 100, finch\u00e9 il divisore fosse maggiore del valore iniziale in byte. A causa di calcoli imprecisi nella versione ottimizzata (overflow del valore long), il risultato del lavoro su numeri molto grandi (exabyte) non corrispondeva alla realt\u00e0. <\/p>\n<p>L'autore del consiglio ha anche cercato di richiamare l'attenzione sul problema della copia degli esempi senza indicare la fonte e senza specificare la licenza. Secondo una ricerca effettuata in precedenza, <noindex><a rel=\"nofollow\" href=\"https:\/\/empirical-software.engineering\/assets\/pdf\/icse19-snippets-slides.pdf\">il 46% degli sviluppatori ha copiato codice da StackOverflow senza citare l'autore, il 75% non sapeva che il codice era distribuito con licenza CC BY-SA, e il 67% non sapeva che ci\u00f2 implicava la necessit\u00e0 di attribuzione.<\/a><\/noindex> un'altra ricerca ha mostrato che copiare esempi di codice comporta non solo il rischio di presenza di errori nel codice, ma anche di vulnerabilit\u00e0. Ad esempio, analizzando 72.483 esempi di codice su StackOverflow in C++, i ricercatori hanno identificato gravi vulnerabilit\u00e0 in 69 esempi (corrispondenti allo 0,09%), inclusi nella lista delle raccomandazioni pi\u00f9 popolari. Analizzando successivamente la presenza di questo codice su GitHub, \u00e8 emerso che il codice vulnerabile copiato da StackOverflow era presente in 2.859 progetti.<\/p>\n<p>Secondo <noindex><a rel=\"nofollow\" href=\"https:\/\/arxiv.org\/pdf\/1910.01321.pdf\">dati<\/a><\/noindex> Il pi\u00f9 popolare esempio di codice Java.<\/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 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\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 -->\n\t<meta name=\"description\" content=\"\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.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/it\/blog\/news\/samyj-populyarnyj-primer-java-koda-na-stackoverflow-okazalsya-s-oshibkoj\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO 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