{"id":29611,"date":"2023-01-09T05:17:52","date_gmt":"2023-01-08T23:47:52","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-to-convert-an-arraylist-of-strings-to-integers-without-any-library-methods\/"},"modified":"2023-01-09T05:17:52","modified_gmt":"2023-01-08T23:47:52","slug":"solved-how-to-convert-an-arraylist-of-strings-to-integers-without-any-library-methods","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-to-convert-an-arraylist-of-strings-to-integers-without-any-library-methods\/","title":{"rendered":"[Solved] How to convert an ArrayList of Strings to integers without any library methods?"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-55567011\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"55567011\" data-parentid=\"55566994\" data-score=\"2\" 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>You are missing something here. You have a <code>List<\/code> of <code>String<\/code>s, and you should iterate over the characters of each of these <code>String<\/code>s separately in order to convert it to an <code>int<\/code>. This means you need two nested loops.<\/p>\n<p>Though there are much easier ways of doing it (with <code>Integer.parseInt()<\/code>), here&#8217;s an implementation based on the logic of your original code:<\/p>\n<pre><code>List&lt;String&gt; numbers = Arrays.asList(\"45\",\"9\",\"77\");\nList&lt;Integer&gt; output = new ArrayList&lt;&gt;();\nfor (String number : numbers) {\n    int res = 0;\n    for (int i = 0; i &lt; number.length(); i++) {\n        res = res * 10 + (number.charAt(i) - '0');\n    }  \n    output.add(res);         \n}\nSystem.out.println (output);\n<\/code><\/pre>\n<p>Output:<\/p>\n<pre><code>[45, 9, 77]\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">3<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved How to convert an ArrayList of Strings to integers without any library methods? <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] You are missing something here. You have a List of Strings, and you should iterate over the characters of each of these Strings separately in order to convert it to an int. This means you need two nested loops. Though there are much easier ways of doing it (with Integer.parseInt()), here&#8217;s an implementation based &#8230; <a title=\"[Solved] How to convert an ArrayList of Strings to integers without any library methods?\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-convert-an-arraylist-of-strings-to-integers-without-any-library-methods\/\" aria-label=\"More on [Solved] How to convert an ArrayList of Strings to integers without any library methods?\">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":[323],"class_list":["post-29611","post","type-post","status-publish","format-standard","hentry","category-solved","tag-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] How to convert an ArrayList of Strings to integers without any library methods? - 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-how-to-convert-an-arraylist-of-strings-to-integers-without-any-library-methods\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] How to convert an ArrayList of Strings to integers without any library methods? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You are missing something here. You have a List of Strings, and you should iterate over the characters of each of these Strings separately in order to convert it to an int. This means you need two nested loops. Though there are much easier ways of doing it (with Integer.parseInt()), here&#8217;s an implementation based ... 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