{"id":734,"date":"2023-04-06T01:54:28","date_gmt":"2023-07-09T09:39:22","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java%e3%81%aeprintf%e3%81%af%e3%80%81%e3%83%95%e3%82%a9%e3%83%bc%e3%83%9e%e3%83%83%e3%83%88%e3%81%95%e3%82%8c%e3%81%9f%e6%96%87%e5%ad%97%e5%88%97%e3%82%92%e3%82%b3%e3%83%b3%e3%82%bd%e3%83%bc\/"},"modified":"2025-08-01T02:02:14","modified_gmt":"2025-07-31T17:02:14","slug":"java%e3%81%aeprintf%e3%81%af%e3%80%81%e3%83%95%e3%82%a9%e3%83%bc%e3%83%9e%e3%83%83%e3%83%88%e3%81%95%e3%82%8c%e3%81%9f%e6%96%87%e5%ad%97%e5%88%97%e3%82%92%e3%82%b3%e3%83%b3%e3%82%bd%e3%83%bc","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%aeprintf%e3%81%af%e3%80%81%e3%83%95%e3%82%a9%e3%83%bc%e3%83%9e%e3%83%83%e3%83%88%e3%81%95%e3%82%8c%e3%81%9f%e6%96%87%e5%ad%97%e5%88%97%e3%82%92%e3%82%b3%e3%83%b3%e3%82%bd%e3%83%bc\/","title":{"rendered":"Java\u306eprintf()\u306f\u3001\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3055\u308c\u305f\u6587\u5b57\u5217\u3092\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u8868\u793a\u3059\u308b\u305f\u3081\u306e\u3082\u306e\u3067\u3059\u3002"},"content":{"rendered":"<p>\u3059\u3067\u306b\u524d\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067Java\u306eprintln()\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u8a71\u3057\u5408\u3044\u307e\u3057\u305f\u3002\u4eca\u65e5\u306f\u3001printf()\u30e1\u30bd\u30c3\u30c9\u3068\u305d\u306e\u3055\u307e\u3056\u307e\u306a\u5b9f\u88c5\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u8a71\u3057\u5408\u3044\u307e\u3059\u3002\u6e96\u5099\u306f\u3044\u3044\u3067\u3059\u304b\uff1f\u59cb\u3081\u307e\u3057\u3087\u3046\uff01<\/p>\n<h2>Java\u306eprintf()<\/h2>\n<ul class=\"post-ul\">\n<li>printf() method is not only there in C, but also in Java.<\/li>\n<li>This method belongs to the PrintStream class.<\/li>\n<li>It\u2019s used to print formatted strings using various format specifiers.<\/li>\n<\/ul>\n<h3>\u69cb\u6587 (\u3053\u3046\u3076\u3093)<\/h3>\n<p>printf()\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u7528\u53ef\u80fd\u306a\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/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>\u6700\u521d\u306e\u3082\u306e\u306f\u4f55\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3082\u884c\u308f\u305a\u3001println() \u30e1\u30bd\u30c3\u30c9\u306e\u3088\u3046\u3067\u3059\u3002<\/p>\n<p>System.out.format()\u30e1\u30bd\u30c3\u30c9\u306f\u3001System.out.printf()\u30e1\u30bd\u30c3\u30c9\u3068\u540c\u3058\u3067\u3059\u3002<\/p>\n<h3>String.format()\u3068System.out.printf()\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\u3002<\/h3>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>String.format()\u306f\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3055\u308c\u305f\u6587\u5b57\u5217\u3092\u8fd4\u3057\u307e\u3059\u3002System.out.printf()\u3082\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3055\u308c\u305f\u6587\u5b57\u5217\u3092\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u51fa\u529b\u3057\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>printf()\u306fjava.util.Formatter\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u3001\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u6587\u5b57\u5217\u3092\u89e3\u6790\u3057\u51fa\u529b\u3092\u751f\u6210\u3057\u307e\u3059\u3002<\/ol>\n<h3>\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u6307\u5b9a\u5b50<\/h3>\n<p>printf\u3067\u5229\u7528\u53ef\u80fd\u306a\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u6307\u5b9a\u5b50\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<ul class=\"post-ul\">\n<li>%c character<\/li>\n<li>%d decimal (integer) number (base 10)<\/li>\n<li>%e exponential floating-point number<\/li>\n<li>%f floating-point number<\/li>\n<li>%i integer (base 10)<\/li>\n<li>%o octal number (base 8)<\/li>\n<li>%s String<\/li>\n<li>%u unsigned decimal (integer) number<\/li>\n<li>%x number in hexadecimal (base 16)<\/li>\n<li>%t formats date\/time<\/li>\n<li>%% print a percent sign<\/li>\n<li>\\% print a percent sign<\/li>\n<\/ul>\n<p>\u6ce8\u610f\uff1a%n\u307e\u305f\u306f\\n\u306f\u3001printf\uff08\uff09\u3067\u6539\u884c\u306e\u533a\u5207\u308a\u3068\u3057\u3066\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3>\u30a8\u30b9\u30b1\u30fc\u30d7\u6587\u5b57<\/h3>\n<p>printf()\u3067\u4f7f\u7528\u3067\u304d\u308b\u30a8\u30b9\u30b1\u30fc\u30d7\u6587\u5b57\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<ul class=\"post-ul\">\n<li>\\b backspace<\/li>\n<li>\\f next line first character starts to the right of current line last character<\/li>\n<li>\\n newline<\/li>\n<li>\\r carriage return<\/li>\n<li>\\t tab<\/li>\n<li>\\\\ backslash<\/li>\n<\/ul>\n<h3>\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u6307\u5b9a\u5b50\u306e\u5b8c\u5168\u306a\u69cb\u6587<\/h3>\n<p>\u62e1\u5f35\u30bb\u30c3\u30c8\u3092\u4f7f\u3063\u305f\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u6307\u5b9a\u5b50\u306e\u5b8c\u5168\u306a\u69cb\u6587\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"post-pre\"><code>%&lt;flags&gt;&lt;width&gt;&lt;.precision&gt;specifier\r\n<\/code><\/pre>\n<p>\u30d5\u30e9\u30b0\u306f\u3001\u53f3\u5bc4\u305b\u306b\u3059\u308b\u5834\u5408\u306b\u306f+\u3001\u5de6\u5bc4\u305b\u306b\u3059\u308b\u5834\u5408\u306b\u306f-\u3068\u3057\u3066\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002\u305d\u308c\u3067\u306f\u3001Jshell\u3092\u8d77\u52d5\u3057\u3066printf()\u3092\u4f7f\u3044\u59cb\u3081\u307e\u3057\u3087\u3046\uff01<\/p>\n<h3>\u6570\u5024\u306e\u66f8\u5f0f\u8a2d\u5b9a<\/h3>\n<p>\u4f8b\u3092\u6319\u3052\u308b\u3068\u3001<\/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(\"Formatted output is: %d %d%n\", x, -x)\r\nFormatted output is: 10 -10\r\n\r\n<\/code><\/pre>\n<p>\u53b3\u5bc6\u306a\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u4f7f\u7528\u3057\u307e\u3057\u3087\u3046\u3002<\/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(\"Precision formatting upto 4 decimal places %.4f\\n\",y)\r\n\r\nPrecision formatting upto 4 decimal places 2.2800\r\n\r\njshell&gt; float z = 3.147293165f\r\nz ==&gt; 3.147293\r\n\r\njshell&gt; System.out.printf(\"Precision formatting upto 2 decimal places %.2f\\n\",z)\r\n\r\nPrecision formatting upto 2 decimal places 3.15\r\n<\/code><\/pre>\n<p>\u7b2c2\u306e\u5834\u5408\u306f\u3001\u6b21\u306e\u5c0f\u6570\u6841\u306b\u56db\u6368\u4e94\u5165\u3055\u308c\u308b\u3053\u3068\u304c\u308f\u304b\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>\u5e45\u6307\u5b9a\u5b50\u3001\u6574\u5217\u3001\u30bc\u30ed\u3067\u57cb\u3081\u308b<\/h3>\n<p>\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u305d\u308c\u305e\u308c\u306b\u3064\u3044\u30663\u3064\u306e\u4f8b\u3092\u898b\u3066\u3044\u304d\u307e\u3059\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>\u6307\u5b9a\u5b50\u5e45\u306b\u3088\u3063\u3066\u30015\u6587\u5b57\u306e\u5e45\u304c\u5272\u308a\u5f53\u3066\u3089\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002\u5185\u5bb9\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u53f3\u5bc4\u305b\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u5de6\u5074\u306e\u7a7a\u767d\u90e8\u5206\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30bc\u30ed\u3067\u57cb\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/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>\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u63c3\u3048\u308b\u3068\u3001+ \u306e\u8a18\u53f7\u3067\u53f3\u5bc4\u308a\u306b\u306a\u308a\u307e\u3059\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>\u6b21\u306e\u30b3\u30fc\u30c9\u306f\u3001\u5de6\u306b\u914d\u7f6e\u3055\u308c\u307e\u3059\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>\u30b3\u30f3\u30de\u3068\u30ed\u30b1\u30fc\u30eb\u306e\u4f7f\u7528<\/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>\u6587\u5b57\u5217\u3001\u30d6\u30fc\u30ea\u30a2\u30f3\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8<\/h3>\n<p>\u3044\u304f\u3064\u304b\u306e\u57fa\u672c\u7684\u306a\u4f8b\u3092\u4f7f\u3063\u3066\u3001String\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306b\u3064\u3044\u3066\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/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<pre class=\"post-pre\"><code>jshell&gt; System.out.printf(\"%s\\f%s!%n\",\"Hello\",\"World!\");\r\nHello\r\n     World!!\r\n<\/code><\/pre>\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>\u5927\u6587\u5b57\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>\u4ee5\u4e0b\u306b\u3001\u30d6\u30fc\u30eb\u5024\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u4f8b\u3092\u793a\u3057\u307e\u3059\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>\u6642\u9593\u306e\u5f62\u5f0f\u5316<\/h3>\n<p>\u300cH\u300d\u3001\u300cM\u300d\u3001\u300cS\u300d\u306f\u3001\u305d\u308c\u305e\u308c\u6642\u9593\u3001\u5206\u3001\u79d2\u3092\u8868\u3057\u307e\u3059\u3002\u300cL\u300d\u3001\u300cN\u300d\u306f\u3001\u30df\u30ea\u79d2\u3068\u30ca\u30ce\u79d2\u3092\u305d\u308c\u305e\u308c\u8868\u3057\u307e\u3059\u3002\u300cp\u300d\u306f\u3001\u5348\u524d\/\u5348\u5f8c\u3092\u793a\u3057\u307e\u3059\u3002\u300cz\u300d\u306f\u3001GMT\u3068\u306e\u5dee\u3092\u51fa\u529b\u3057\u307e\u3059\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(\"H : %tH, M: %tM, S: %tS%n\",date,date,date)\r\nH : 02, M: 15, S: 36\r\n\r\n<\/code><\/pre>\n<p>\u5f8c\u8005\u306f\u540c\u3058\u3082\u306e\u304c\u591a\u304f\u5fc5\u8981\u3067\u3059\u3002\u4ee3\u308f\u308a\u306b\u3001\u305d\u308c\u3089\u3092\u4e00\u3064\u3060\u3051\u3067\u7f6e\u304d\u63db\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; System.out.printf(\"%1$tH:%1$tM:%1$tS %1$Tp GMT %1$tz  %n\", date)\r\n02:15:36 AM GMT +0530\r\n<\/code><\/pre>\n<h3>\u65e5\u4ed8\u306e\u66f8\u5f0f\u8a2d\u5b9a (\u3072\u3065\u3051\u306e\u3057\u3087\u3057\u304d\u305b\u3063\u3066\u3044)<\/h3>\n<p>\u65e5\u4ed8\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306b\u306f\u4ee5\u4e0b\u306e\u7279\u6b8a\u6587\u5b57\u304c\u3042\u308a\u307e\u3059\uff1aA\/a &#8211; \u5b8c\u5168\u306a\u66dc\u65e5\/\u7701\u7565\u3055\u308c\u305f\u66dc\u65e5\u3001B\/b &#8211; \u5b8c\u5168\u306a\u6708\u540d\/\u7701\u7565\u3055\u308c\u305f\u6708\u540d\u3001d &#8211; \u4e8c\u6841\u306e\u65e5\u3001m &#8211; \u4e8c\u6841\u306e\u6708\u3001Y &#8211; \u5b8c\u5168\u306a\u5e74\/\u5e74\u306e\u4e0b2\u6841\u3001j &#8211; \u5e74\u9593\u306e\u65e5\u6570\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; System.out.printf(\"%s %tB %&lt;te, %&lt;tY\", \"Current date: \", date);\r\nCurrent date:  April 19, 2019\r\n\r\njshell&gt; System.out.printf(\"%1$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\", \"Current date: \", date);\r\nCurrent date:  Apr 19, 19\r\n\r\n<\/code><\/pre>\n<h2>\u7d50\u8ad6<\/h2>\n<p>\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001printf\uff08\uff09\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u53ef\u80fd\u306a\u3055\u307e\u3056\u307e\u306a\u5f62\u5f0f\u8a2d\u5b9a\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3057\u305f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3059\u3067\u306b\u524d\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067Java\u306eprintln()\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u8a71\u3057\u5408\u3044\u307e\u3057\u305f\u3002\u4eca\u65e5\u306f\u3001printf()\u30e1\u30bd\u30c3\u30c9\u3068\u305d\u306e\u3055\u307e\u3056\u307e\u306a\u5b9f\u88c5\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u8a71\u3057\u5408\u3044\u307e\u3059\u3002\u6e96\u5099\u306f\u3044\u3044\u3067\u3059\u304b\uff1f\u59cb\u3081\u307e\u3057\u3087\u3046\uff01 Java\u306eprint [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-734","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"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\u306eprintf()\u306f\u3001\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3055\u308c\u305f\u6587\u5b57\u5217\u3092\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u8868\u793a\u3059\u308b\u305f\u3081\u306e\u3082\u306e\u3067\u3059\u3002 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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