{"id":792,"date":"2023-07-18T09:31:56","date_gmt":"2024-02-25T09:41:32","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/%e5%b0%86java%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%bd%ac%e6%8d%a2%e4%b8%ba%e5%8f%8c%e7%b2%be%e5%ba%a6%e6%b5%ae%e7%82%b9%e6%95%b0\/"},"modified":"2025-08-03T08:02:59","modified_gmt":"2025-08-03T00:02:59","slug":"%e5%b0%86java%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%bd%ac%e6%8d%a2%e4%b8%ba%e5%8f%8c%e7%b2%be%e5%ba%a6%e6%b5%ae%e7%82%b9%e6%95%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%b0%86java%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%bd%ac%e6%8d%a2%e4%b8%ba%e5%8f%8c%e7%b2%be%e5%ba%a6%e6%b5%ae%e7%82%b9%e6%95%b0\/","title":{"rendered":"Java\u5b57\u7b26\u4e32\u8f6c\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570\u7684\u5168\u9762\u6559\u7a0b\u4e0e\u5b9e\u7528\u6280\u5de7"},"content":{"rendered":"<p>Java \u4e2d\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570\u3002\u4eca\u5929\u6211\u4eec\u5c06\u4ecb\u7ecd\u4e00\u4e9b\u5e38\u89c1\u7684\u65b9\u6cd5\uff0c\u5c06 Java \u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u53cc\u7cbe\u5ea6\u539f\u59cb\u6570\u636e\u7c7b\u578b\u6216 Double \u5bf9\u8c61\u3002\u8bf7\u6ce8\u610f\uff0c\u7531\u4e8e Java \u652f\u6301\u81ea\u52a8\u88c5\u7bb1\uff0c\u53cc\u7cbe\u5ea6\u539f\u59cb\u7c7b\u578b\u548c Double \u5bf9\u8c61\u53ef\u4ee5\u4e92\u76f8\u66ff\u6362\uff0c\u6ca1\u6709\u4efb\u4f55\u95ee\u9898\u3002<\/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>Java\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570<\/h2>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/6564855ca4b2f92e6c7307b9\/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>\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528parseDouble()\u65b9\u6cd5\u5c06\u5b57\u7b26\u4e32\u89e3\u6790\u4e3adouble\u7c7b\u578b\u3002\u5b57\u7b26\u4e32\u53ef\u4ee5\u4ee5\u201c-\u201d\u5f00\u5934\u8868\u793a\u8d1f\u6570\u6216\u4ee5\u201c+\u201d\u5f00\u5934\u8868\u793a\u6b63\u6570\u3002\u53e6\u5916\uff0c\u53cc\u7cbe\u5ea6\u503c\u4e2d\u7684\u5c3e\u968f0\u5c06\u88ab\u5220\u9664\u3002\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528\u201cd\u201d\u4f5c\u4e3a\u6807\u8bc6\u7b26\u6765\u8868\u793a\u5b57\u7b26\u4e32\u662f\u4e00\u4e2adouble\u7c7b\u578b\u7684\u503c\u3002\u8be5\u65b9\u6cd5\u8fd4\u56de\u53cc\u7cbe\u5ea6\u57fa\u672c\u7c7b\u578b\u3002\u4e0b\u9762\u7684\u4ee3\u7801\u7247\u6bb5\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528Double.parseDouble()\u65b9\u6cd5\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3adouble\u7c7b\u578b\u3002<\/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); \/\/ \u8fd4\u56de\u53cc\u7cbe\u5ea6\u57fa\u672c\u7c7b\u578b<\/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\uff0c\u5c3e\u968f0\u88ab\u5220\u9664<\/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 \/>\n\u8fd9\u4e2a\u65b9\u6cd5\u7684\u5de5\u4f5c\u65b9\u5f0f\u4e0eparseDouble()\u65b9\u6cd5\u51e0\u4e4e\u76f8\u4f3c\uff0c\u53ea\u662f\u5b83\u8fd4\u56deDouble\u5bf9\u8c61\u3002\u8ba9\u6211\u4eec\u770b\u770b\u5982\u4f55\u4f7f\u7528\u8fd9\u4e2a\u65b9\u6cd5\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3aDouble\u5bf9\u8c61\u3002<br \/>\nString str = &#8220;123.45&#8221;;<br \/>\nDouble d = Double.valueOf(str); \/\/ \u8fd4\u56deDouble\u5bf9\u8c61<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 \/>\n\u6211\u4eec\u8fd8\u53ef\u4ee5\u901a\u8fc7\u5176\u6784\u9020\u51fd\u6570\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3aDouble\u5bf9\u8c61\u3002\u5982\u679c\u6211\u4eec\u60f3\u8981\u53cc\u7cbe\u5ea6\u57fa\u672c\u7c7b\u578b\uff0c\u90a3\u4e48\u6211\u4eec\u53ef\u4ee5\u5728\u5b83\u4e0a\u9762\u4f7f\u7528doubleValue()\u65b9\u6cd5\u3002\u6ce8\u610f\uff0c\u8fd9\u4e2a\u6784\u9020\u51fd\u6570\u5df2\u7ecf\u5728Java 9\u4e2d\u88ab\u5f03\u7528\u4e86\uff0c\u63a8\u8350\u4f7f\u7528parseDouble()\u6216valueOf()\u65b9\u6cd5\u3002<br \/>\nString str = &#8220;98.7&#8221;;<br \/>\ndouble d = new Double(str).doubleValue(); \/\/ \u6784\u9020\u51fd\u6570\u5728Java 9\u4e2d\u88ab\u5f03\u7528<br \/>\nSystem.out.println(d); \/\/98.7<\/p>\n<p>DecimalFormat parse()<br \/>\n\u8fd9\u4e2a\u65b9\u6cd5\u5bf9\u4e8e\u89e3\u6790\u683c\u5f0f\u5316\u7684\u5b57\u7b26\u4e32\u4e3adouble\u5f88\u6709\u7528\u3002\u4f8b\u5982\uff0c\u5982\u679c\u5b57\u7b26\u4e32\u662f\u201c1,11,111.23d\u201d\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528DecimalFormat\u5c06\u8be5\u5b57\u7b26\u4e32\u89e3\u6790\u4e3adouble\u7c7b\u578b\uff1a<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>\u6ce8\u610f\uff0cparse()\u65b9\u6cd5\u8fd4\u56deNumber\u7684\u5b9e\u4f8b\uff0c\u56e0\u6b64\u6211\u4eec\u8c03\u7528doubleValue()\u6765\u4ece\u4e2d\u83b7\u53d6\u53cc\u7cbe\u5ea6\u57fa\u672c\u7c7b\u578b\u3002\u5982\u679c\u5b57\u7b26\u4e32\u683c\u5f0f\u4e0d\u6b63\u786e\uff0c\u8be5\u65b9\u6cd5\u5c06\u629b\u51faParseException\u3002<\/p>\n<p>\u8fd9\u5c31\u662f\u5173\u4e8e\u5728Java\u7a0b\u5e8f\u4e2d\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3adouble\u7684\u6240\u6709\u5185\u5bb9\u3002\u53c2\u8003\uff1aDouble API\u6587\u6863\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java \u4e2d\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570\u3002\u4eca\u5929\u6211\u4eec\u5c06\u4ecb\u7ecd\u4e00\u4e9b\u5e38\u89c1\u7684\u65b9\u6cd5\uff0c\u5c06 Java \u5b57\u7b26\u4e32\u8f6c\u6362 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[225,180,2111,181,612],"class_list":{"0":"post-792","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-java","9":"tag-2111","10":"tag-181","11":"tag-612"},"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>Java\u5b57\u7b26\u4e32\u8f6c\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570\u7684\u5168\u9762\u6559\u7a0b\u4e0e\u5b9e\u7528\u6280\u5de7 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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