{"id":10797,"date":"2022-09-25T00:41:39","date_gmt":"2022-09-24T19:11:39","guid":{"rendered":"http:\/\/jassweb.com\/solved\/solved-why-bitset-allows-values-distinct-from-1-and-0\/"},"modified":"2022-09-25T00:41:39","modified_gmt":"2022-09-24T19:11:39","slug":"solved-why-bitset-allows-values-distinct-from-1-and-0","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-why-bitset-allows-values-distinct-from-1-and-0\/","title":{"rendered":"[Solved] Why Bitset allows values distinct from 1 and 0?"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-41848183\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"41848183\" data-parentid=\"41847693\" data-score=\"6\" data-position-on-page=\"2\" data-highest-scored=\"0\" data-question-has-accepted-highest-score=\"0\" itemprop=\"suggestedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p><code>BitSet<\/code> logically represents a &#8220;vector of bits that grows as needed&#8221; (<a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/java\/util\/BitSet.html\">javadoc<\/a>).<\/p>\n<p>When you create it via <code>new BitSet()<\/code>, you have all bits set to 0 (false).<\/p>\n<pre><code>0    5    10\n|    |    |\n000000000000... (virtually infinite sequence)\n<\/code><\/pre>\n<p>Using <code>set(x)<\/code> you set to 1 (true) the bit at position <em>x<\/em> (where the first position is 0); e.g. in your code you enable bits 3, 5 and 9.<\/p>\n<pre><code>0    5    10\n|    |    |\n000101000100...\n<\/code><\/pre>\n<p><code>toString()<\/code> reports the list of bits set to 1, i.e. 3, 5 and 9 in the example.<\/p>\n<p><code>toByteArray()<\/code> converts the contents of the <code>BitSet<\/code> to a sequence of <code>byte<\/code> values, each containing the value of 8 contiguous bits, in little-endian order (i.e. starting from least indices in the <code>BitSet<\/code>). The output <code>{40, 2}<\/code> in your example comes from:<\/p>\n<pre><code> 7      0   15     8    &lt;- position in BitSet\n |      |   |      |\n{00101000 , 00000010}   &lt;- toByteArray(), binary\n    |          |\n{  40     ,    2    }   &lt;- toByteArray(), decimal\n<\/code><\/pre>\n<p>Hope this helps.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">2<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Why Bitset allows values distinct from 1 and 0? <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] BitSet logically represents a &#8220;vector of bits that grows as needed&#8221; (javadoc). When you create it via new BitSet(), you have all bits set to 0 (false). 0 5 10 | | | 000000000000&#8230; (virtually infinite sequence) Using set(x) you set to 1 (true) the bit at position x (where the first position is &#8230; <a title=\"[Solved] Why Bitset allows values distinct from 1 and 0?\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-why-bitset-allows-values-distinct-from-1-and-0\/\" aria-label=\"More on [Solved] Why Bitset allows values distinct from 1 and 0?\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[2959,323],"class_list":["post-10797","post","type-post","status-publish","format-standard","hentry","category-solved","tag-bitset","tag-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Why Bitset allows values distinct from 1 and 0? - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-why-bitset-allows-values-distinct-from-1-and-0\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Why Bitset allows values distinct from 1 and 0? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] BitSet logically represents a &#8220;vector of bits that grows as needed&#8221; (javadoc). 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