{"id":1200,"date":"2012-12-20T10:21:21","date_gmt":"2012-12-20T01:21:21","guid":{"rendered":"http:\/\/www.techscore.com\/blog\/?p=1200"},"modified":"2018-11-14T16:33:58","modified_gmt":"2018-11-14T07:33:58","slug":"%e3%81%82%e3%81%88%e3%81%a6%e8%a8%80%e3%81%86%e3%81%bb%e3%81%a9%e3%81%a7%e3%81%af%e3%81%aa%e3%81%84%e3%80%80%e6%95%b0%e5%80%a4%e5%a4%89%e6%8f%9b%e6%99%82%e3%81%ae%e5%9e%8b%e3%83%81%e3%82%a7%e3%83%83","status":"publish","type":"post","link":"https:\/\/www.techscore.com\/blog\/2012\/12\/20\/%e3%81%82%e3%81%88%e3%81%a6%e8%a8%80%e3%81%86%e3%81%bb%e3%81%a9%e3%81%a7%e3%81%af%e3%81%aa%e3%81%84%e3%80%80%e6%95%b0%e5%80%a4%e5%a4%89%e6%8f%9b%e6%99%82%e3%81%ae%e5%9e%8b%e3%83%81%e3%82%a7%e3%83%83\/","title":{"rendered":"\u3042\u3048\u3066\u8a00\u3046\u307b\u3069\u3067\u306f\u306a\u3044\u3000\u6570\u5024\u5909\u63db\u6642\u306e\u578b\u30c1\u30a7\u30c3\u30af Java\u7de8"},"content":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306fJava\u30d7\u30ed\u30b0\u30e9\u30de\u306a\u3046\u306e\u6751\u4e0a\u3067\u3059\u3002<\/p>\n<p>\u4eca\u56de\u306f\u6570\u5024\u5909\u63db\u6642\u306e\u578b\u30c1\u30a7\u30c3\u30af\u306b\u95a2\u3059\u308b\u8a18\u4e8b\u3067\u3059\u3002<\/p>\n<p>\u4ee5\u524d<a href=\"http:\/\/www.techscore.com\/blog\/2012\/11\/28\/%E6%95%B0%E5%80%A4-%E2%87%94-%E6%96%87%E5%AD%97%E5%88%97%E5%A4%89%E6%8F%9B-java%E7%B7%A8\/\">\u6570\u5024 \u21d4 \u6587\u5b57\u5217\u5909\u63db<\/a>\u3067\u6587\u5b57\u5217\u3092\u6570\u5024\u5909\u63db\u3059\u308b\u6642\u306f<\/p>\n<pre class=\"lang:java decode:true\">Integer.parseInt(s);\r\nnew Integer(s).intValue();\r\nInteger.valueOf(s).intValue();<\/pre>\n<p>\u3068\u304b\u3067\u6570\u5024\u5909\u63db\u3059\u308b\u3088\u3046\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3066\u307e\u3057\u305f\u304c\u3001\u3060\u3044\u305f\u3044\u6570\u5024\u5909\u63db\u3059\u308b\u6642\u306f\u6570\u5024\u5909\u63db\u53ef\u80fd\u304b\u306e\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u3092\u3059\u308b\u306e\u304c\u304a\u884c\u5100\u304c\u826f\u3044\u3067\u3059\u3002<br \/>\n\u306a\u306e\u3067\u3001\u4eca\u56de\u306f\u6570\u5024\u5909\u63db\u6642\u306e\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u306b\u3064\u3044\u3066<\/p>\n<p>\u578b\u30c1\u30a7\u30c3\u30af\u306e\u65b9\u6cd5\u306f\u8272\u3005\u3042\u308b\u3068\u304a\u3082\u3044\u307e\u3059\u304c\u3001\u6b21\u306e3\u3064\u3067\u691c\u8a3c\u3057\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n<ol>\n<li>Integer#parseInt()\u6642\u306e\u4f8b\u5916\u30c1\u30a7\u30c3\u30af\n<pre class=\"lang:java decode:true \">public boolean isNumber(String val) {\r\n\ttry {\r\n\t\tInteger.parseInt(val);\r\n\t\treturn true;\r\n\t} catch (NumberFormatException nfex) {\r\n\t\treturn false;\r\n\t}\r\n}<\/pre>\n<\/li>\n<li>\u6b63\u898f\u8868\u73fe\u30c1\u30a7\u30c3\u30af\n<pre class=\"lang:java decode:true \">public boolean isNumber(String val) {\r\n\tString regex = \"\\\\A[-]?[0-9]+\\\\z\";\r\n\tPattern p = Pattern.compile(regex);\r\n\tMatcher m1 = p.matcher(val);\r\n\treturn m1.find();\r\n}<\/pre>\n<\/li>\n<li>commons-lang\u306eNumberUtils#isNumber()\n<pre class=\"lang:java decode:true \">public boolean isNumber(String val) {\r\n\treturn NumberUtils.isNumber(val);\r\n}<\/pre>\n<\/li>\n<\/ol>\n<p>(\u6ce8\u610f)<\/p>\n<ul>\n<li>\u4eca\u56de\u306f\u6574\u6570\u6642\u306e\u30c1\u30a7\u30c3\u30af\u306e\u307f\u3068\u3044\u3046\u3053\u3068\u306b\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n<li>\u6b63\u898f\u8868\u73fe\u306e\u30c1\u30a7\u30c3\u30af\u306e\u5b9f\u969b\u306e\u30b3\u30fc\u30c9\u306fPattern\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306b\u3057\u3066\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210\u306e\u30b3\u30b9\u30c8\u3092\u4e0b\u3052\u3066\u3044\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>100\u4e07\u56de\u306e\u30eb\u30fc\u30d7\u3067\u3059\u3079\u3066true\u3092\u8fd4\u3059\u3082\u306e\u5834\u5408(\u6587\u5b57\u5217\u306e1\u3068\u304b)\u3068\u3059\u3079\u3066false\u3092\u8fd4\u3059\u5834\u5408(\u6587\u5b57\u5217\u306ea\u3068\u304b)\u3067\u8abf\u67fb\u3057\u307e\u3057\u305f\u3002<br \/>\n\u4ee5\u4e0b\u7d50\u679c\u3067\u3059\u3002\u5358\u4f4d\u306f\u30df\u30ea\u79d2\u3067\u3059\u3002<\/p>\n<table>\n<tbody>\n<tr>\n<th colspan=\"2\"><\/th>\n<th>Java5<\/th>\n<th>Java6<\/th>\n<th>Java7<\/th>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #E5E4E8;\">\n<td rowspan=\"2\">Integer#parseInt()<\/td>\n<td>\u3059\u3079\u3066true<\/td>\n<td>292<\/td>\n<td>218<\/td>\n<td>183<\/td>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #E5E4E8;\">\n<td>\u3059\u3079\u3066false<\/td>\n<td>1739<\/td>\n<td>1329<\/td>\n<td>1051<\/td>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #E5E4E8;\">\n<td rowspan=\"2\">\u6b63\u898f\u8868\u73fe\u30c1\u30a7\u30c3\u30af<\/td>\n<td>\u3059\u3079\u3066true<\/td>\n<td>532<\/td>\n<td>455<\/td>\n<td>291<\/td>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #E5E4E8;\">\n<td>\u3059\u3079\u3066false<\/td>\n<td>515<\/td>\n<td>455<\/td>\n<td>273<\/td>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #E5E4E8;\">\n<td rowspan=\"2\">NumberUtils#isNumber()<\/td>\n<td>\u3059\u3079\u3066true<\/td>\n<td>212<\/td>\n<td>180<\/td>\n<td>159<\/td>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #E5E4E8;\">\n<td>\u3059\u3079\u3066false<\/td>\n<td>212<\/td>\n<td>187<\/td>\n<td>128<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Integer#parseInt()\u306ftrue\u3092\u8fd4\u3059\u5834\u5408\u3068false\u3092\u8fd4\u3059\u5834\u5408\u3067\u305a\u3044\u3076\u3093\u3068\u5dee\u304c\u3067\u307e\u3059\u306d\u3002<br \/>\n\u30a8\u30e9\u30fc\u6642\u306f\u4f8b\u5916\u30af\u30e9\u30b9\u3092\u751f\u6210\u3057\u3066\u30b9\u30ed\u30fc\u3059\u308b\u306e\u3067\u9045\u304f\u306a\u308a\u305d\u3046\u306a\u611f\u3058\u304c\u3057\u307e\u3059\u306d\u3002<br \/>\n\u6b63\u898f\u8868\u73fe\u30c1\u30a7\u30c3\u30af\u3068NumberUtils#isNumber()\u306f\u3069\u3061\u3089\u3082\u5b89\u5b9a\u3057\u3066\u3044\u307e\u3059\u306d\u3002<\/p>\n<p>\u305f\u3060\u4eca\u56de\u306f\u6574\u6570\u306b\u9650\u3063\u3066\u306a\u306e\u3067\u3054\u6ce8\u610f\u3092\uff01\uff01<br \/>\n\u3061\u306a\u307f\u306b\u6b21\u306e\u6587\u5b57\u5217\u3067\u305d\u308c\u305e\u308c\u304c\u8fd4\u3059\u5024\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<table>\n<tbody>\n<tr>\n<th>\u30b1\u30fc\u30b9<\/th>\n<th>Integer#parseInt()<\/th>\n<th>\u6b63\u898f\u8868\u73fe\u30c1\u30a7\u30c3\u30af<\/th>\n<th>NumberUtils#isNumber()<\/th>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #E5E4E8;\">\n<td>1<\/td>\n<td>true<\/td>\n<td>true<\/td>\n<td>true<\/td>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #E5E4E8;\">\n<td>123<\/td>\n<td>true<\/td>\n<td>true<\/td>\n<td>true<\/td>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #E5E4E8;\">\n<td>a<\/td>\n<td>false<\/td>\n<td>false<\/td>\n<td>false<\/td>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #E5E4E8;\">\n<td>0<\/td>\n<td>true<\/td>\n<td>true<\/td>\n<td>true<\/td>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #E5E4E8;\">\n<td>-100<\/td>\n<td>true<\/td>\n<td>true<\/td>\n<td>true<\/td>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #E5E4E8;\">\n<td>10-10<\/td>\n<td>false<\/td>\n<td>false<\/td>\n<td>false<\/td>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #E5E4E8;\">\n<td>+100<\/td>\n<td>true<\/td>\n<td>false<\/td>\n<td>false<\/td>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #E5E4E8;\">\n<td>10+10<\/td>\n<td>false<\/td>\n<td>false<\/td>\n<td>false<\/td>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #E5E4E8;\">\n<td>+<\/td>\n<td>false<\/td>\n<td>false<\/td>\n<td>false<\/td>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #E5E4E8;\">\n<td>-<\/td>\n<td>false<\/td>\n<td>false<\/td>\n<td>false<\/td>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #E5E4E8;\">\n<td>1.0<\/td>\n<td>false<\/td>\n<td>false<\/td>\n<td>true<\/td>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #E5E4E8;\">\n<td>1.1<\/td>\n<td>false<\/td>\n<td>false<\/td>\n<td>true<\/td>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #E5E4E8;\">\n<td>1,000<\/td>\n<td>false<\/td>\n<td>false<\/td>\n<td>false<\/td>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #E5E4E8;\">\n<td>12345678901234567890<\/td>\n<td>false<\/td>\n<td>true<\/td>\n<td>true<\/td>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #FFA54F;\">\n<td>0x123<\/td>\n<td>false<\/td>\n<td>false<\/td>\n<td>true<\/td>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #FFA54F;\">\n<td>123L<\/td>\n<td>false<\/td>\n<td>false<\/td>\n<td>true<\/td>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #FFA54F;\">\n<td>123D<\/td>\n<td>false<\/td>\n<td>false<\/td>\n<td>true<\/td>\n<\/tr>\n<tr style=\"background: none repeat scroll 0 0 #FFA54F;\">\n<td>12e3<\/td>\n<td>false<\/td>\n<td>false<\/td>\n<td>true<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u203b \u7db2\u639b\u3051\u90e8\u5206\u3092\u8ffd\u8a18(2014\u5e745\u670822\u65e5)<br \/>\n\u4eca\u56de\u306f\u6574\u6570\u306e\u307f\u3068\u3044\u3046\u3053\u3068\u306a\u306e\u3067\u300116\u9032\u6570\u3001long\u578b\u3001\u5c0f\u6570\u70b9\u306a\u3069\u306e\u8868\u8a18\u65b9\u6cd5\u3067\u306f\u7d50\u679c\u304c\u7570\u306a\u308a\u307e\u3059\u3002<br \/>\n\u958b\u767a\u6642\u306b\u306f\u6ce8\u610f\u3092\uff01\uff01\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306fJava\u30d7\u30ed\u30b0\u30e9\u30de\u306a\u3046\u306e\u6751\u4e0a\u3067\u3059\u3002<\/p>\n<p>\u4eca\u56de\u306f\u6570\u5024\u5909\u63db\u6642\u306e\u578b\u30c1\u30a7\u30c3\u30af\u306b\u95a2\u3059\u308b\u8a18\u4e8b\u3067\u3059\u3002<br \/><a href=\"https:\/\/www.techscore.com\/blog\/2012\/12\/20\/%e3%81%82%e3%81%88%e3%81%a6%e8%a8%80%e3%81%86%e3%81%bb%e3%81%a9%e3%81%a7%e3%81%af%e3%81%aa%e3%81%84%e3%80%80%e6%95%b0%e5%80%a4%e5%a4%89%e6%8f%9b%e6%99%82%e3%81%ae%e5%9e%8b%e3%83%81%e3%82%a7%e3%83%83\/\">\u7d9a\u304d\u3092\u8aad\u3080...<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[18],"tags":[57,28],"_links":{"self":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/1200"}],"collection":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/comments?post=1200"}],"version-history":[{"count":2,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/1200\/revisions"}],"predecessor-version":[{"id":4198,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/1200\/revisions\/4198"}],"wp:attachment":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/media?parent=1200"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/categories?post=1200"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/tags?post=1200"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}