{"id":1481,"date":"2022-09-17T07:41:34","date_gmt":"2022-10-01T08:49:29","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/uncategorized\/how-can-i-convert-a-java-string-into-a-double-data-type\/"},"modified":"2024-03-18T15:03:50","modified_gmt":"2024-03-18T15:03:50","slug":"how-can-i-convert-a-java-string-into-a-double-data-type","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-can-i-convert-a-java-string-into-a-double-data-type\/","title":{"rendered":"How can I convert a Java String into a double data type?"},"content":{"rendered":"<p>There are several ways to convert a Java String to a double value. In this article, we will explore some commonly used methods for converting a Java String to either a double primitive type or a Double object. It is important to note that Java&#8217;s support for autoboxing allows for seamless interchangeability between the double primitive type and the Double object.<\/p>\n<pre class=\"post-pre\"><code>Double d1 = 10.25d;\r\n\/\/autoboxing from double to Double\r\ndouble d = Double.valueOf(10.25); \r\n\/\/unboxing from Double to double\r\n<\/code><\/pre>\n<h2>How to convert a String to a <a href=\"https:\/\/www.w3schools.com\/java\/ref_keyword_double.asp\">Double in Java<\/a>.<\/h2>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/655dc633cdcf9b67579ffb3c\/3-0.png\" alt=\"java convert string to double, java string to double\" \/><\/div>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>Double.parseDouble()<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>The parseDouble() method can be used to convert a String to a double. The String can start with &#8220;-&#8221; to indicate a negative number or &#8220;+&#8221; to indicate a positive number. Trailing 0s are removed from the double value. The identifier &#8220;d&#8221; can also be used to indicate that the String is a double value. This method returns a double primitive type. The code snippet below demonstrates how to convert a String to a double using Double.parseDouble():<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>String str = &#8220;+123.4500d&#8221;;<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>double d = Double.parseDouble(str); \/\/ returns double primitive<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>System.out.println(d); \/\/-123.45, trailing 0s are removed<\/ol>\n<\/li>\n<\/ol>\n<p>System.out.println(Double.parseDouble(&#8220;123.45001&#8221;)); \/\/123.45001<br \/>\nSystem.out.println(Double.parseDouble(&#8220;123.45001d&#8221;)); \/\/123.45001<br \/>\nSystem.out.println(Double.parseDouble(&#8220;123.45000&#8221;)); \/\/123.45<br \/>\nSystem.out.println(Double.parseDouble(&#8220;123.45001D&#8221;)); \/\/123.45001<\/p>\n<p>Double.valueOf()<br \/>\nThis method works in a similar way to the parseDouble() method, but it returns a Double object. The code snippet below shows how to use this method to convert a String to a Double object:<br \/>\nString str = &#8220;123.45&#8221;;<br \/>\nDouble d = Double.valueOf(str); \/\/ returns Double object<br \/>\nSystem.out.println(d); \/\/123.45<\/p>\n<p>System.out.println(Double.valueOf(&#8220;123.45d&#8221;)); \/\/123.45<br \/>\nSystem.out.println(Double.valueOf(&#8220;123.4500d&#8221;)); \/\/123.45<br \/>\nSystem.out.println(Double.valueOf(&#8220;123.45D&#8221;)); \/\/123.45<\/p>\n<p>new Double(String s)<br \/>\nWe can also convert a String to a Double object using its constructor. If we want a double primitive type, we can use the doubleValue() method on it. Note that this constructor has been deprecated in Java 9 and it is recommended to use the parseDouble() or valueOf() methods instead. The code snippet below demonstrates how to convert a String to a Double object using its constructor:<br \/>\nString str = &#8220;98.7&#8221;;<br \/>\ndouble d = new Double(str).doubleValue(); \/\/constructor deprecated in java 9<br \/>\nSystem.out.println(d); \/\/98.7<\/p>\n<p>DecimalFormat parse()<br \/>\nThis method is useful for parsing a formatted string to a double. For example, if the String is &#8220;1,11,111.23d&#8221;, we can use DecimalFormat to parse this string to a double as shown below:<br \/>\nString str = &#8220;1,11,111.23d&#8221;;<br \/>\ntry {<br \/>\ndouble l = DecimalFormat.getNumberInstance().parse(str).doubleValue();<br \/>\nSystem.out.println(l); \/\/111111.23<br \/>\n} catch (ParseException e) {<br \/>\ne.printStackTrace();<br \/>\n}<\/p>\n<p>Note that the parse() method returns an instance of Number, so we are calling doubleValue() to get the double primitive type from it. This method also throws a ParseException if the string is not properly formatted.<\/p>\n<p>The above information concludes the process of converting a string to a double in a Java program. You can refer to the Double API documentation for more details.<\/p>\n<p>&nbsp;<\/p>\n<p>More tutorials<\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/comprehending-javas-data-types\/\" target=\"_blank\" rel=\"noopener\">Comprehending Java&#8217;s Data Types<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/converting-a-string-to-a-byte-array-and-a-byte-array-to-a-string-in-the-java-programming-language\/\" target=\"_blank\" rel=\"noopener\">Converting string to array in the Java programming language<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/addition-assignment-operator-in-java\/\" target=\"_blank\" rel=\"noopener\">Addition Assignment Operator mean in Java<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/javas-random-number-generator\/\" target=\"_blank\" rel=\"noopener\">Java&#8217;s Random Number Generator<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/python-functions-ord-and-chr\/\" target=\"_blank\" rel=\"noopener\">The Python functions ord() and chr()<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>There are several ways to convert a Java String to a double value. In this article, we will explore some commonly used methods for converting a Java String to either a double primitive type or a Double object. It is important to note that Java&#8217;s support for autoboxing allows for seamless interchangeability between the double [&hellip;]<\/p>\n","protected":false},"author":14,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-1481","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How can I convert a Java String into a double data type? - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"There are several ways to convert a Java String to a double value. 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