{"id":31871,"date":"2023-01-25T06:08:06","date_gmt":"2023-01-25T00:38:06","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-does-the-comparator-works-with-arrays-sort\/"},"modified":"2023-01-25T06:08:06","modified_gmt":"2023-01-25T00:38:06","slug":"solved-how-does-the-comparator-works-with-arrays-sort","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-does-the-comparator-works-with-arrays-sort\/","title":{"rendered":"[Solved] How does the Comparator works with Arrays.sort?"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-51169254\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"51169254\" data-parentid=\"51168709\" data-score=\"3\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" 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>Rules for <code>a.compareTo(b)<\/code><\/p>\n<ul>\n<li><code>returns negative value<\/code> : <code>a is before b<\/code><\/li>\n<li><code>returns 0<\/code> : <code>a equal to b<\/code><\/li>\n<li><code>return positive value<\/code> : <code>a is after b<\/code><\/li>\n<\/ul>\n<hr>\n<p>Because the parameter are <code>first, second<\/code> and you compare like <code>second.compareTo(first)<\/code> you&#8217;ll get reverse order : <\/p>\n<pre><code>(second+first)   344 first+ second  434 comparing : -1 &gt;&gt;   4 is before 34\n(second+first)   423 first+ second  234 comparing : 2  &gt;&gt;  23 is after   4\n(second+first)  3423 first+ second 2334 comparing : 1  &gt;&gt;  23 is after  34\n(second+first)  3415 first+ second 1534 comparing : 2  &gt;&gt;  15 is after  34\n(second+first)  2315 first+ second 1523 comparing : 1  &gt;&gt;  15 is after  23\n<\/code><\/pre>\n<blockquote>\n<p>With these 5 <code>before\/after<\/code> rules the order is <code>4 34 23 15<\/code><\/p>\n<p>Which is <em><code>Reverse Lexical Order<\/code><\/em> (Lexical because use of <code>String<\/code>, reverse because compare second to first)<\/p>\n<\/blockquote>\n<hr>\n<p><em>Details for one case<\/em><\/p>\n<ul>\n<li>The <code>sort<\/code> method will compare <code>4<\/code> and <code>34<\/code>, so <code>first=4<\/code> and <code>second=34<\/code><\/li>\n<li>you compute <code>\"344\".compareTo(\"434\")<\/code>, because 344 is before 434 is lexical order you got -1<\/li>\n<li>Because of <code>-1<\/code> the <code>sort<\/code> method will remember that <code>4<\/code> is before <code>34<\/code><\/li>\n<\/ul>\n<\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\"><\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved How does the Comparator works with Arrays.sort? <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Rules for a.compareTo(b) returns negative value : a is before b returns 0 : a equal to b return positive value : a is after b Because the parameter are first, second and you compare like second.compareTo(first) you&#8217;ll get reverse order : (second+first) 344 first+ second 434 comparing : -1 &gt;&gt; 4 is before &#8230; <a title=\"[Solved] How does the Comparator works with Arrays.sort?\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-how-does-the-comparator-works-with-arrays-sort\/\" aria-label=\"More on [Solved] How does the Comparator works with Arrays.sort?\">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":[361,1880,323],"class_list":["post-31871","post","type-post","status-publish","format-standard","hentry","category-solved","tag-arrays","tag-comparator","tag-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>[Solved] How does the Comparator works with Arrays.sort? 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