{"id":24002,"date":"2024-03-17T00:05:17","date_gmt":"2024-03-16T15:05:17","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ae%e6%ad%a3%e8%a6%8f%e8%a1%a8%e7%8f%be%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%a6%e6%95%b0%e5%ad%97%e3%81%8b%e3%81%a9%e3%81%86%e3%81%8b%e3%82%92%e5%88%a4%e6%96%ad%e3%81%99%e3%82%8b\/"},"modified":"2025-08-07T18:27:45","modified_gmt":"2025-08-07T09:27:45","slug":"java%e3%81%ae%e6%ad%a3%e8%a6%8f%e8%a1%a8%e7%8f%be%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%a6%e6%95%b0%e5%ad%97%e3%81%8b%e3%81%a9%e3%81%86%e3%81%8b%e3%82%92%e5%88%a4%e6%96%ad%e3%81%99%e3%82%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ae%e6%ad%a3%e8%a6%8f%e8%a1%a8%e7%8f%be%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%a6%e6%95%b0%e5%ad%97%e3%81%8b%e3%81%a9%e3%81%86%e3%81%8b%e3%82%92%e5%88%a4%e6%96%ad%e3%81%99%e3%82%8b\/","title":{"rendered":"Java\u306e\u6b63\u898f\u8868\u73fe\u3092\u4f7f\u7528\u3057\u3066\u6570\u5b57\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f"},"content":{"rendered":"<p>Java\u306e\u6b63\u898f\u8868\u73fe\u3092\u4f7f\u7528\u3057\u3066\u3001\u6587\u5b57\u5217\u304c\u6570\u5b57\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u305d\u306e\u5b9f\u88c5\u4f8b\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-type\">boolean<\/span> <span class=\"hljs-title function_\">isNumeric<\/span><span class=\"hljs-params\">(String str)<\/span> {\r\n    <span class=\"hljs-comment\">\/\/ \u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u5339\u914d\u6570\u5b57<\/span>\r\n    <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">regex<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"^[0-9]+$\"<\/span>;\r\n    <span class=\"hljs-keyword\">return<\/span> str.matches(regex);\r\n}\r\n<\/code><\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001matches()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u6307\u5b9a\u3055\u308c\u305f\u6b63\u898f\u8868\u73fe\u3068\u4e00\u81f4\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002 \u6b63\u898f\u8868\u73fe\u300c^[0-9]+$\u300d\u306f\u3001\u6587\u5b57\u5217\u304c\u6570\u5b57\u306e\u307f\u3067\u69cb\u6210\u3055\u308c\u3001\u7a7a\u3067\u306a\u3044\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306f\u4f7f\u7528\u4f8b\u3067\u3059\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> {\r\n    <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">str1<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"12345\"<\/span>;\r\n    <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">str2<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"12.34\"<\/span>;\r\n    \r\n    System.out.println(isNumeric(str1)); <span class=\"hljs-comment\">\/\/ \u8f93\u51fa\uff1atrue<\/span>\r\n    System.out.println(isNumeric(str2)); <span class=\"hljs-comment\">\/\/ \u8f93\u51fa\uff1afalse<\/span>\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u3001isNumeric()\u30e1\u30bd\u30c3\u30c9\u304c2\u3064\u306e\u6587\u5b57\u5217\u304c\u6570\u5b57\u304b\u3069\u3046\u304b\u3092\u305d\u308c\u305e\u308c\u5224\u65ad\u3057\u3001\u7d50\u679c\u306ftrue\u3068false\u3067\u3057\u305f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u306e\u6b63\u898f\u8868\u73fe\u3092\u4f7f\u7528\u3057\u3066\u3001\u6587\u5b57\u5217\u304c\u6570\u5b57\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u305d\u306e\u5b9f\u88c5\u4f8b\u3067\u3059\u3002 public static boolean isNumeric(String str) { \/\/ \u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u5339\u914d\u6570\u5b57 [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-24002","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) - 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