{"id":738,"date":"2023-04-19T12:26:09","date_gmt":"2023-04-02T05:24:59","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java%e3%81%aelong%e5%9e%8b%e3%82%92string%e5%9e%8b%e3%81%ab%e5%a4%89%e6%8f%9b%e3%81%99%e3%82%8b\/"},"modified":"2025-08-01T02:03:56","modified_gmt":"2025-07-31T17:03:56","slug":"java%e3%81%aelong%e5%9e%8b%e3%82%92string%e5%9e%8b%e3%81%ab%e5%a4%89%e6%8f%9b%e3%81%99%e3%82%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%aelong%e5%9e%8b%e3%82%92string%e5%9e%8b%e3%81%ab%e5%a4%89%e6%8f%9b%e3%81%99%e3%82%8b\/","title":{"rendered":"Java\u306elong\u578b\u3092String\u578b\u306b\u5909\u63db\u3059\u308b"},"content":{"rendered":"<p>\u4eca\u65e5\u306f\u3001Java\u3067long\u3092\u6587\u5b57\u5217\u306b\u5909\u63db\u3059\u308b\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002Java\u306elong\u304b\u3089\u6587\u5b57\u5217\u3078\u306e\u5909\u63db\u306f\u3001\u591a\u304f\u306e\u65b9\u6cd5\u3067\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4f8b\u3068\u30b3\u30fc\u30c9\u306e\u65ad\u7247\u3092\u4f7f\u3063\u3066\u3001\u305d\u308c\u305e\u308c\u306e\u65b9\u6cd5\u3092\u9806\u306b\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<h2>Java\u306eLong\u3092String\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\uff1a<\/h2>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65649d83daa94e2bdf7c1e20\/2-0.png\" alt=\"java long to string\" \/><\/div>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>+\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3059\u308b<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u3053\u308c\u306f\u3001Java\u3067long\u3092\u6587\u5b57\u5217\u306b\u5909\u63db\u3059\u308b\u6700\u3082\u7c21\u5358\u306a\u65b9\u6cd5\u3067\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>long l = 123L;<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>String str = l+&#8221;&#8221;; \/\/ str\u306f&#8217;123&#8242;<\/ol>\n<\/li>\n<\/ol>\n<p>Long.toString()\u3092\u4f7f\u7528\u3059\u308b<br \/>\nLong\u30af\u30e9\u30b9\u306etoString\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001long\u306e\u6587\u5b57\u5217\u8868\u73fe\u309210\u9032\u6570\u3067\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30b3\u30fc\u30c9\u30b9\u30cb\u30da\u30c3\u30c8\u3067\u306f\u3001Java\u3067long\u3092\u6587\u5b57\u5217\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\nlong l = 12345L;<br \/>\nString str = Long.toString(l);<br \/>\nSystem.out.println(str); \/\/ &#8216;12345&#8217;\u3092\u51fa\u529b\u3059\u308b<\/p>\n<p>8\u9032\u6570\u308416\u9032\u6570\u306a\u3069\u3001\u4ed6\u306e\u5f62\u5f0f\u3067\u3082long\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u3053\u308c\u3089\u306e\u30b7\u30ca\u30ea\u30aa\u3067long\u3092\u6587\u5b57\u5217\u306b\u5909\u63db\u3059\u308b\u3068\u3069\u3046\u306a\u308b\u304b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<br \/>\nlong l = 0x11L;<br \/>\nString str = Long.toString(l);<br \/>\nSystem.out.println(str); \/\/ &#8217;17&#8217;\u3092\u51fa\u529b\u3059\u308b<br \/>\nl = 011L;<br \/>\nstr = Long.toString(l);<br \/>\nSystem.out.println(str); \/\/ &#8216;9&#8217;\u3092\u51fa\u529b\u3059\u308b<\/p>\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\u6587\u5b57\u5217\u306f\u5e38\u306b10\u9032\u6570\u306e\u5f62\u5f0f\u3067\u8fd4\u3055\u308c\u307e\u3059\u3002\u4ed6\u306e\u65b9\u6cd5\u3082\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>String.valueOf()\u3092\u4f7f\u7528\u3059\u308b<br \/>\nlong l = 12345L;<br \/>\nString str = String.valueOf(l); \/\/ str\u306f&#8217;12345&#8242;<\/p>\n<p>new Long(long l)\u3092\u4f7f\u7528\u3059\u308b<br \/>\nJava 9\u304b\u3089\u3001long\u5f15\u6570\u3092\u6301\u3064Long\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30fc\u306f\u975e\u63a8\u5968\u306b\u306a\u308a\u307e\u3057\u305f\u304c\u3001\u305d\u308c\u3092\u77e5\u3063\u3066\u304a\u304f\u3079\u304d\u3067\u3059\u3002<br \/>\nlong l = 12345L;<br \/>\n\/\/ Java 9\u304b\u3089\u975e\u63a8\u5968\u3067\u3059\u304c\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u305f\u3081\u306bvalueOf\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044<br \/>\nString str = new Long(l).toString(); \/\/ str\u306f&#8217;12345&#8242;<\/p>\n<p>String.format()\u3092\u4f7f\u7528\u3059\u308b<br \/>\nlong l = 369L;<br \/>\nString s = String.format(&#8220;%d&#8221;, l);<\/p>\n<p>DecimalFormat\u3092\u4f7f\u7528\u3059\u308b<br \/>\nlong l = 12345L;<br \/>\nString str = DecimalFormat.getNumberInstance().format(l);<br \/>\nSystem.out.println(str); \/\/ str\u306f&#8217;12,345&#8242;<br \/>\n\/\/ \u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u9069\u7528\u3057\u306a\u3044\u5834\u5408<br \/>\nstr = new DecimalFormat(&#8220;#&#8221;).format(l);<br \/>\nSystem.out.println(str); \/\/ str\u306f&#8217;12345&#8242;<\/p>\n<p>StringBuilder\u3001StringBuffer\u3092\u4f7f\u7528\u3059\u308b<br \/>\nlong l = 12345L;<br \/>\nString str = new StringBuilder().append(l).toString();<\/p>\n<h2>Java\u306eLong\u3092String\u306b\u5909\u63db\u3059\u308b\u4f8b<\/h2>\n<p>\u3053\u3053\u306b\u306f\u3001\u4e0a\u8a18\u3067\u898b\u305f\u3055\u307e\u3056\u307e\u306a\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001long\u3092\u6587\u5b57\u5217\u306b\u5909\u63db\u3057\u3066\u8868\u793a\u3059\u308b\u7c21\u5358\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.string;\r\n\r\nimport java.text.DecimalFormat;\r\n\r\npublic class JavaLongToString {\r\n\r\n\t@SuppressWarnings(\"deprecation\")\r\n\tpublic static void main(String[] args) {\r\n\t\tlong l = 12345L;\r\n\t\tString str = Long.toString(l);\r\n\t\tSystem.out.println(str);\r\n\r\n\t\tstr = String.valueOf(l);\r\n\t\tSystem.out.println(str);\r\n\r\n\t\t\/\/ deprecated from Java 9, use valueOf for better performance\r\n\t\tstr = new Long(l).toString();\r\n\t\tSystem.out.println(str);\r\n\r\n\t\tstr = String.format(\"%d\", l);\r\n\t\tSystem.out.println(str);\r\n\r\n\t\tstr = l + \"\";\r\n\t\tSystem.out.println(str);\r\n\r\n\t\tstr = DecimalFormat.getNumberInstance().format(l);\r\n\t\tSystem.out.println(str);\r\n\r\n\t\tstr = new DecimalFormat(\"#\").format(l);\r\n\t\tSystem.out.println(str);\r\n\r\n\t\tstr = new StringBuilder().append(l).toString();\r\n\t\tSystem.out.println(str);\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u9577\u3044\u5024\u30928\u9032\u6570\u307e\u305f\u306f16\u9032\u6570\u5f62\u5f0f\u306b\u5909\u66f4\u3059\u308b\u3068\u3001\u6587\u5b57\u5217\u8868\u73fe\u306f\u5e38\u306b10\u9032\u6570\u5f62\u5f0f\u3067\u3042\u308b\u3053\u3068\u306b\u6c17\u4ed8\u304f\u3067\u3057\u3087\u3046\u3002<\/p>\n<h2>Long\u578b\u3092String\u578b\u306b\u5909\u63db\u3059\u308b\u969b\u306e\u57fa\u6570\u6307\u5b9a\u306b\u3064\u3044\u3066\u3001\u65e5\u672c\u8a9e\u3067\u8aac\u660e\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/h2>\n<p>\u300c\u57fa\u6570\u3092\u6307\u5b9a\u3057\u3066\u3001Long\u578b\u3092String\u578b\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8ff0\u3079\u307e\u3059\u3002\u300d<\/p>\n<p>\u3082\u3057\u79c1\u305f\u3061\u304c\u30c7\u30d5\u30a9\u30eb\u30c8\u306e10\u9032\u6570\u3067\u306f\u306a\u304f\u3001\u7570\u306a\u308b\u57fa\u6570\u3067long\u578b\u3092\u6587\u5b57\u5217\u306b\u5909\u63db\u3057\u305f\u3044\u5834\u5408\u3001Long\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u30b9\u30cb\u30da\u30c3\u30c8\u306f\u30018\u9032\u6570\u308416\u9032\u6570\u3001\u307e\u305f\u306f\u30ab\u30b9\u30bf\u30e0\u306e\u57fa\u6570\u3067long\u5909\u6570\u306e\u6587\u5b57\u5217\u8868\u73fe\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>long number = 45;\r\nSystem.out.println(Long.toBinaryString(number)); \/\/101101\r\nSystem.out.println(Long.toOctalString(number)); \/\/55\r\nSystem.out.println(Long.toHexString(number)); \/\/2d\r\nSystem.out.println(Long.toString(number, 5)); \/\/140\r\n<\/code><\/pre>\n<p>\u3053\u308c\u3067\u3001Java\u30d7\u30ed\u30b0\u30e9\u30e0\u3067long\u578b\u3092String\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u306e\u8aac\u660e\u306f\u7d42\u308f\u308a\u3067\u3059\u3002\u53c2\u8003\u6587\u732e\uff1aLong API\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4eca\u65e5\u306f\u3001Java\u3067long\u3092\u6587\u5b57\u5217\u306b\u5909\u63db\u3059\u308b\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002Java\u306elong\u304b\u3089\u6587\u5b57\u5217\u3078\u306e\u5909\u63db\u306f\u3001\u591a\u304f\u306e\u65b9\u6cd5\u3067\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4f8b\u3068\u30b3\u30fc\u30c9\u306e\u65ad\u7247\u3092\u4f7f\u3063\u3066\u3001\u305d\u308c\u305e\u308c\u306e\u65b9\u6cd5\u3092\u9806\u306b\u8aac\u660e\u3057\u307e\u3059\u3002 Java\u306eLo [&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":[26,61],"class_list":["post-738","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\u306elong\u578b\u3092String\u578b\u306b\u5909\u63db\u3059\u308b - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Java\u306elong\u578b\u3092String\u578b\u306b\u5909\u63db\u3059\u308b\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\u3002\" 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