{"id":494,"date":"2023-09-23T12:31:28","date_gmt":"2023-05-06T13:43:43","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java%e4%b8%ad%e7%9a%84printf%e5%87%bd%e6%95%b0-%e5%b0%86%e6%a0%bc%e5%bc%8f%e5%8c%96%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2%e6%89%93%e5%8d%b0%e5%88%b0%e6%8e%a7%e5%88%b6%e5%8f%b0\/"},"modified":"2025-08-02T13:59:08","modified_gmt":"2025-08-02T05:59:08","slug":"java%e4%b8%ad%e7%9a%84printf%e5%87%bd%e6%95%b0-%e5%b0%86%e6%a0%bc%e5%bc%8f%e5%8c%96%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2%e6%89%93%e5%8d%b0%e5%88%b0%e6%8e%a7%e5%88%b6%e5%8f%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e4%b8%ad%e7%9a%84printf%e5%87%bd%e6%95%b0-%e5%b0%86%e6%a0%bc%e5%bc%8f%e5%8c%96%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2%e6%89%93%e5%8d%b0%e5%88%b0%e6%8e%a7%e5%88%b6%e5%8f%b0\/","title":{"rendered":"Java printf()\u51fd\u6570\u5b8c\u5168\u6307\u5357\uff1a\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u8f93\u51fa\u6280\u5de7\u4e0e\u5b9e\u4f8b"},"content":{"rendered":"<p>\u6211\u4eec\u4e4b\u524d\u5df2\u7ecf\u8ba8\u8bba\u4e86Java\u4e2d\u7684println()\u65b9\u6cd5\u3002\u4eca\u5929\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u8ba8\u8bbaprintf()\u65b9\u6cd5\u53ca\u5176\u4e0d\u540c\u7684\u5b9e\u73b0\u65b9\u5f0f\u3002\u51c6\u5907\u597d\u4e86\u5417\uff1f\u5f00\u59cb\u5427\uff01<\/p>\n<h2>Java printf() \u53ef\u4ee5\u7528\u4e2d\u6587\u7ffb\u8bd1\u4e3a&#8221;Java \u6253\u5370\u683c\u5f0f\u5316\u8f93\u51fa&#8221;\u3002<\/h2>\n<ul class=\"post-ul\">\n<li>printf()\u65b9\u6cd5\u4e0d\u4ec5\u5728C\u8bed\u8a00\u4e2d\u5b58\u5728\uff0c\u5728Java\u4e2d\u4e5f\u6709\u3002<\/li>\n<li>\u8be5\u65b9\u6cd5\u5c5e\u4e8ePrintStream\u7c7b\u3002<\/li>\n<li>\u5b83\u7528\u4e8e\u4f7f\u7528\u5404\u79cd\u683c\u5f0f\u8bf4\u660e\u7b26\u6253\u5370\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u3002<\/li>\n<\/ul>\n<h3>\u8bed\u6cd5<\/h3>\n<p>\u4ee5\u4e0b\u662fprintf()\u65b9\u6cd5\u53ef\u7528\u7684\u8bed\u6cd5\uff1a<\/p>\n<pre class=\"post-pre\"><code>System.out.printf(string);\r\nSystem.out.printf(format, arguments);\r\nSystem.out.printf(locale, format, arguments);\r\n<\/code><\/pre>\n<p>\u7b2c\u4e00\u79cd\u8bed\u6cd5\u4e0d\u9700\u8981\u4efb\u4f55\u683c\u5f0f\u5316\uff0c\u5c31\u50cfprintln()\u65b9\u6cd5\u4e00\u6837\u3002<\/p>\n<p>System.out.format()\u548cSystem.out.printf()\u65b9\u6cd5\u662f\u76f8\u540c\u7684\u3002<\/p>\n<h3>String.format()\u548cSystem.out.printf()\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h3>\n<ol>\n<li>String.format()\u8fd4\u56de\u4e00\u4e2a\u683c\u5f0f\u5316\u7684\u5b57\u7b26\u4e32\u3002System.out.printf()\u4e0d\u4ec5\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\uff0c\u8fd8\u4f1a\u5c06\u5176\u6253\u5370\u5230\u63a7\u5236\u53f0\u3002<\/li>\n<li>printf()\u4f7f\u7528java.util.Formatter\u7c7b\u6765\u89e3\u6790\u683c\u5f0f\u5b57\u7b26\u4e32\u5e76\u751f\u6210\u8f93\u51fa\u3002<\/li>\n<\/ol>\n<h3>\u683c\u5f0f\u6307\u793a\u7b26<\/h3>\n<p>\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e0bprintf\u51fd\u6570\u53ef\u7528\u7684\u683c\u5f0f\u8bf4\u660e\u7b26\u6709\u54ea\u4e9b\u3002<\/p>\n<ul class=\"post-ul\">\n<li>%c &#8211; \u5b57\u7b26<\/li>\n<li>%d &#8211; \u5341\u8fdb\u5236\uff08\u6574\u6570\uff09\u6570\u5b57\uff08\u57fa\u6570\u4e3a10\uff09<\/li>\n<li>%e &#8211; \u6307\u6570\u5f62\u5f0f\u7684\u6d6e\u70b9\u6570<\/li>\n<li>%f &#8211; \u6d6e\u70b9\u6570<\/li>\n<li>%i &#8211; \u6574\u6570\uff08\u57fa\u6570\u4e3a10\uff09<\/li>\n<li>%o &#8211; \u516b\u8fdb\u5236\u6570\uff08\u57fa\u6570\u4e3a8\uff09<\/li>\n<li>%s &#8211; \u5b57\u7b26\u4e32<\/li>\n<li>%u &#8211; \u65e0\u7b26\u53f7\u5341\u8fdb\u5236\uff08\u6574\u6570\uff09\u6570\u5b57<\/li>\n<li>%x &#8211; \u5341\u516d\u8fdb\u5236\u6570\uff08\u57fa\u6570\u4e3a16\uff09<\/li>\n<li>%t &#8211; \u683c\u5f0f\u5316\u65e5\u671f\/\u65f6\u95f4<\/li>\n<li>%% &#8211; \u6253\u5370\u767e\u5206\u53f7<\/li>\n<li>\\% &#8211; \u6253\u5370\u767e\u5206\u53f7<\/li>\n<\/ul>\n<p>\u6ce8\u610f\uff1a\u5728printf()\u4e2d\uff0c%n\u6216\\n\u88ab\u7528\u4f5c\u6362\u884c\u7b26\u3002<\/p>\n<h3>\u8f6c\u4e49\u5b57\u7b26<\/h3>\n<p>\u4ee5\u4e0b\u662f\u5728printf()\u4e2d\u53ef\u7528\u7684\u8f6c\u4e49\u5b57\u7b26\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\\b &#8211; \u9000\u683c<\/li>\n<li>\\f &#8211; \u6362\u9875\uff0c\u4e0b\u4e00\u884c\u7684\u7b2c\u4e00\u4e2a\u5b57\u7b26\u4ece\u5f53\u524d\u884c\u6700\u540e\u4e00\u4e2a\u5b57\u7b26\u7684\u53f3\u4fa7\u5f00\u59cb<\/li>\n<li>\\n &#8211; \u6362\u884c<\/li>\n<li>\\r &#8211; \u56de\u8f66<\/li>\n<li>\\t &#8211; \u5236\u8868\u7b26<\/li>\n<li>\\\\ &#8211; \u53cd\u659c\u6760<\/li>\n<\/ul>\n<h3>\u683c\u5f0f\u8bf4\u660e\u7b26\u5b8c\u6574\u8bed\u6cd5<\/h3>\n<p>\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u5177\u6709\u6269\u5c55\u96c6\u7684\u683c\u5f0f\u8bf4\u660e\u7b26\u7684\u5b8c\u6574\u8bed\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code>%&lt;flags&gt;&lt;width&gt;&lt;.precision&gt;specifier\r\n<\/code><\/pre>\n<p>\u5728\u683c\u5f0f\u8bf4\u660e\u7b26\u4e2d\uff0c\u4f7f\u7528&#8221;+&#8221;\u53ef\u4ee5\u53f3\u5bf9\u9f50\uff0c\u4f7f\u7528&#8221;-&#8220;\u53ef\u4ee5\u5de6\u5bf9\u9f50\u3002\u63a5\u4e0b\u6765\uff0c\u542f\u52a8\u60a8\u7684Jshell\u5e76\u5f00\u59cb\u4f7f\u7528printf()\uff01<\/p>\n<h3>\u6570\u5b57\u683c\u5f0f\u5316<\/h3>\n<p>\u8fd9\u91cc\u6709\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<pre class=\"post-pre\"><code>|  Welcome to JShell -- Version 12.0.1\r\n|  For an introduction type: \/help intro\r\n\r\njshell&gt; int x = 10\r\nx ==&gt; 10\r\n\r\njshell&gt; System.out.printf(\"\u683c\u5f0f\u5316\u8f93\u51fa\u4e3a: %d %d%n\", x, -x)\r\n\u683c\u5f0f\u5316\u8f93\u51fa\u4e3a: 10 -10\r\n\r\n<\/code><\/pre>\n<p>\u8ba9\u6211\u4eec\u4f7f\u7528\u4e00\u4e9b\u7cbe\u786e\u7684\u683c\u5f0f\u5316\uff1a<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; float y = 2.28f\r\ny ==&gt; 2.28\r\n\r\njshell&gt; System.out.printf(\"\u7cbe\u786e\u683c\u5f0f\u5316\u52304\u4f4d\u5c0f\u6570 %.4f\\n\",y)\r\n\r\n\u7cbe\u786e\u683c\u5f0f\u5316\u52304\u4f4d\u5c0f\u6570 2.2800\r\n\r\njshell&gt; float z = 3.147293165f\r\nz ==&gt; 3.147293\r\n\r\njshell&gt; System.out.printf(\"\u7cbe\u786e\u683c\u5f0f\u5316\u52302\u4f4d\u5c0f\u6570 %.2f\\n\",z)\r\n\r\n\u7cbe\u786e\u683c\u5f0f\u5316\u52302\u4f4d\u5c0f\u6570 3.15\r\n<\/code><\/pre>\n<p>\u6b63\u5982\u60a8\u6240\u770b\u5230\u7684\uff0c\u5728\u7b2c\u4e8c\u79cd\u60c5\u51b5\u4e0b\uff0c\u5b83\u4f1a\u56db\u820d\u4e94\u5165\u5230\u4e0b\u4e00\u4e2a\u5c0f\u6570\u4f4d\u3002<\/p>\n<h3>\u5bbd\u5ea6\u8bf4\u660e\u7b26\u3001\u5bf9\u9f50\u3001\u4ee5\u96f6\u586b\u5145<\/h3>\n<p>\u5728\u672c\u8282\u4e2d\uff0c\u6211\u4eec\u5c06\u4e3a\u6bcf\u4e2a\u4f8b\u5b50\u63d0\u4f9b\u4e09\u4e2a\u793a\u4f8b\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; System.out.printf(\"'%5.2f'%n\", 2.28);\r\n' 2.28'\r\n<\/code><\/pre>\n<p>\u5982\u60a8\u6240\u89c1\uff0c\u5bbd\u5ea6\u6307\u5b9a\u7b26\u5206\u914d\u4e86\u4e94\u4e2a\u5b57\u7b26\u5bbd\u5ea6\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u5185\u5bb9\u53f3\u5bf9\u9f50\u3002\u7a7a\u767d\u5904\u53ef\u4ee5\u4f7f\u7528\u96f6\u586b\u5145\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; System.out.printf(\"'%05.2f'%n\", 2.28);\r\n'02.28'\r\n\r\njshell&gt; System.out.printf(\"'%010.2f'%n\", 2.28);\r\n'0000002.28'\r\n\r\njshell&gt; System.out.printf(\"'%010.2f'%n\", -2.28);\r\n'-000002.28'\r\n\r\njshell&gt; System.out.printf(\"'%010.2f'%n\", 1234567.89);\r\n'1234567.89'\r\n\r\njshell&gt; System.out.printf(\"'%010.2f'%n\", -1234567.89);\r\n'-1234567.89'\r\n\r\n<\/code><\/pre>\n<p>\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u5bf9\u9f50\u65b9\u5f0f\u4e3a\u53f3\u5bf9\u9f50\uff0c\u4f7f\u7528+\u7b26\u53f7\u8868\u793a\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; System.out.printf(\"'%10.2f'%n\", 2.28);\r\n'      2.28'\r\n<\/code><\/pre>\n<p>\u4e0b\u9762\u7684\u4ee3\u7801\u9760\u5de6\u5bf9\u9f50\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; System.out.printf(\"'%-10.2f'%n\", 2.28);\r\n'2.28      '\r\n<\/code><\/pre>\n<p>\u4f7f\u7528\u9017\u53f7\u548c\u5730\u57df\uff1a<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; System.out.printf(Locale.US, \"%,d %n\", 5000);\r\n5,000\r\n<\/code><\/pre>\n<h3>\u5b57\u7b26\u4e32\u548c\u5e03\u5c14\u578b\u683c\u5f0f\u5316<\/h3>\n<p>\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u4f7f\u7528\u4e00\u4e9b\u57fa\u672c\u793a\u4f8b\u8fdb\u884c\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\uff1a<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; System.out.printf(\"%s %s!%n\",\"\u4f60\u597d\",\"\u4e16\u754c\");\r\n\u4f60\u597d \u4e16\u754c!\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>jshell&gt; System.out.printf(\"%s\\f%s!%n\",\"\u4f60\u597d\",\"\u4e16\u754c!\");\r\n\u4f60\u597d\r\n     \u4e16\u754c!!\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>jshell&gt; System.out.printf(\"%s\\\\%s!%n\",\"\u4f60\u597d\",\"\u4e16\u754c!\");\r\n\u4f60\u597d\\\u4e16\u754c!!\r\n<\/code><\/pre>\n<p>\u5927\u5199\u8f6c\u6362\uff1a<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; System.out.printf(\"%s %S!%n\",\"Hello\",\"World\");\r\nHello WORLD!\r\n<\/code><\/pre>\n<p>\u4e0b\u9762\u7ed9\u51fa\u4e86\u5e03\u5c14\u683c\u5f0f\u5316\u7684\u793a\u4f8b\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; System.out.printf(\"%b%n\", false);\r\nfalse\r\n\r\njshell&gt; System.out.printf(\"%b%n\", 0.5);\r\ntrue\r\n\r\njshell&gt; System.out.printf(\"%b%n\", \"false\");\r\ntrue\r\n<\/code><\/pre>\n<h3>\u65f6\u95f4\u683c\u5f0f\u5316<\/h3>\n<p>&#8220;H&#8221;\u8868\u793a\u5c0f\u65f6\uff0c&#8221;M&#8221;\u8868\u793a\u5206\u949f\uff0c&#8221;S&#8221;\u8868\u793a\u79d2\u3002&#8217;L&#8217;\u548c&#8217;N&#8217;\u5206\u522b\u7528\u6765\u8868\u793a\u6beb\u79d2\u548c\u7eb3\u79d2\u7684\u65f6\u95f4\u3002&#8217;p&#8217;\u8868\u793a\u4e0a\u5348\/\u4e0b\u5348\u3002&#8217;z&#8217;\u6253\u5370\u51fa\u4e0e\u683c\u6797\u5c3c\u6cbb\u6807\u51c6\u65f6\u95f4\u7684\u5dee\u5f02\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; Date date = new Date();\r\ndate ==&gt; Fri Apr 19 02:15:36 IST 2019\r\n\r\njshell&gt; System.out.printf(\"%tT%n\", date);\r\n02:15:36\r\n\r\njshell&gt; System.out.printf(\"\u5c0f\u65f6 : %tH, \u5206\u949f: %tM, \u79d2: %tS%n\",date,date,date)\r\n\u5c0f\u65f6 : 02, \u5206\u949f: 15, \u79d2: 36\r\n\r\n<\/code><\/pre>\n<p>\u540e\u8005\u9700\u8981\u5f88\u591a\u76f8\u540c\u7684\u53c2\u6570\u3002\u76f8\u53cd\uff0c\u6211\u4eec\u53ef\u4ee5\u7528\u4e00\u4e2a\u53c2\u6570\u6765\u66ff\u6362\u5b83\u4eec\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; System.out.printf(\"%1$tH:%1$tM:%1$tS %1$Tp GMT %1$tz  %n\", date)\r\n02:15:36 AM GMT +0530\r\n<\/code><\/pre>\n<h3>\u65e5\u671f\u683c\u5f0f\u5316<\/h3>\n<p>\u65e5\u671f\u683c\u5f0f\u6709\u4e0b\u5217\u7279\u6b8a\u5b57\u7b26:<br \/>\nA\/a &#8211; \u5b8c\u6574\u7684\u661f\u671f\uff08\u5168\u79f0\/\u7f29\u5199\uff09<br \/>\nB\/b &#8211; \u5b8c\u6574\u7684\u6708\u4efd\uff08\u5168\u79f0\/\u7f29\u5199\uff09<br \/>\nd &#8211; \u683c\u5f0f\u5316\u4e3a\u4e24\u4f4d\u6570\u7684\u65e5\u671f<br \/>\nm &#8211; \u683c\u5f0f\u5316\u4e3a\u4e24\u4f4d\u6570\u7684\u6708\u4efd<br \/>\nY &#8211; \u5b8c\u6574\u7684\u5e74\u4efd\/\u5e74\u4efd\u7684\u6700\u540e\u4e24\u4f4d\u6570\u5b57<br \/>\nj &#8211; \u4e00\u5e74\u4e2d\u7684\u7b2c\u51e0\u5929<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; System.out.printf(\"%s %tB %&lt;te, %&lt;tY\", \"\u5f53\u524d\u65e5\u671f: \", date);\r\n\u5f53\u524d\u65e5\u671f:  April 19, 2019\r\n\r\njshell&gt; System.out.printf(\"%1$td.%1$tm.%1$ty %n\", date);\r\n19.04.19\r\n\r\njshell&gt; System.out.printf(\"%s %tb %&lt;te, %&lt;ty\", \"\u5f53\u524d\u65e5\u671f: \", date);\r\n\u5f53\u524d\u65e5\u671f:  Apr 19, 19\r\n\r\n<\/code><\/pre>\n<h2>\u7ed3\u8bba<\/h2>\n<p>\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u6211\u4eec\u8ba8\u8bba\u4e86\u4f7f\u7528printf()\u65b9\u6cd5\u53ef\u4ee5\u8fdb\u884c\u7684\u5404\u79cd\u683c\u5f0f\u5316\u9009\u9879\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6211\u4eec\u4e4b\u524d\u5df2\u7ecf\u8ba8\u8bba\u4e86Java\u4e2d\u7684println()\u65b9\u6cd5\u3002\u4eca\u5929\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u8ba8\u8bbaprintf()\u65b9\u6cd5\u53ca\u5176\u4e0d\u540c\u7684\u5b9e\u73b0\u65b9 [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[189,225,1488,1490,1489],"class_list":{"0":"post-494","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-java","9":"tag-printf","10":"tag-1490","11":"tag-1489"},"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 printf()\u51fd\u6570\u5b8c\u5168\u6307\u5357\uff1a\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u8f93\u51fa\u6280\u5de7\u4e0e\u5b9e\u4f8b - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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