{"id":936,"date":"2018-11-15T12:00:29","date_gmt":"2018-11-15T03:00:29","guid":{"rendered":"https:\/\/www.bold.ne.jp\/engineer-club\/?p=936"},"modified":"2025-09-17T13:48:32","modified_gmt":"2025-09-17T04:48:32","slug":"java-indexof","status":"publish","type":"post","link":"https:\/\/www.bold.ne.jp\/engineer-club\/java-indexof","title":{"rendered":"Java\u306eindexof\u3068\u306f\uff1f\u6587\u5b57\u30fb\u6587\u5b57\u5217\u306e\u4f4d\u7f6e\u3092\u8abf\u3079\u308bString.indexOf\/lastIndexOf\u306e\u4f7f\u3044\u65b9"},"content":{"rendered":"<p>String.indexOf\/lastIndexOf\u306f\u3001\u6307\u5b9a\u3057\u305f\u6587\u5b57\u30fb\u6587\u5b57\u5217\u304c<span>String<\/span>\u4e2d\u306b\u51fa\u73fe\u3059\u308b\u4f4d\u7f6e<span>(<\/span>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9<span>)<\/span>\u3092\u623b\u3059\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<br \/>\n<span>Java<\/span>\u3067\u306e\u6587\u5b57\u5217\u64cd\u4f5c\u3067\u306f\u57fa\u672c\u306e\u4e00\u3064\u3067\u3059\u306e\u3067\u3001\u3057\u3063\u304b\u308a\u899a\u3048\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001<strong><\/strong><span class=\"f-marker-p\"><strong>String.indexOf\/lastIndexOf\u306e\u4f7f\u3044\u65b9<\/strong><\/span>\u304b\u3089\u3001<strong><span class=\"f-marker-p\">\u7c21\u5358\u306a\u5fdc\u7528\u307e\u3067<\/span><\/strong>\u3092\u521d\u5fc3\u8005\u5411\u3051\u306b\u304a\u4f1d\u3048\u3057\u307e\u3059\u3002<\/p>\n<p>\u203b\u3053\u306e\u8a18\u4e8b\u306e\u30b5\u30f3\u30d7\u30eb\u306f\u3001<span>Java 10<\/span>\u306e\u74b0\u5883\u3067\u52d5\u4f5c\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<div id=\"toc_container\" class=\"no_bullets\"><p class=\"toc_title\">\u76ee\u6b21<\/p><ul class=\"toc_list\"><li><a href=\"#JavaStringindexOflastIndexOf\">\uff11\uff0e\u3010Java\u3011String.indexOf\/lastIndexOf\u306e\u4f7f\u3044\u65b9<\/a><ul><li><a href=\"#-String\">\uff11-\uff11\uff0eString\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3068\u306f\u6587\u5b57\u5358\u4f4d\u306e\u4f4d\u7f6e<\/a><\/li><li><a href=\"#-StringindexOf\">\uff11-\uff12\uff0eString.indexOf\u306f\u6587\u5b57\u30fb\u6587\u5b57\u5217\u3092\u524d\u304b\u3089\u63a2\u3059<\/a><\/li><li><a href=\"#-StringlastIndexOf\">\uff11-\uff13\uff0eString.lastIndexOf\u306f\u6587\u5b57\u30fb\u6587\u5b57\u5217\u3092\u5f8c\u308d\u304b\u3089\u63a2\u3059<\/a><\/li><li><a href=\"#i\">\uff11-\uff14\uff0e\u63a2\u3059\u6587\u5b57\u306f\u5927\u6587\u5b57\u30fb\u5c0f\u6587\u5b57\u304b\u3069\u3046\u304b\u306b\u6c17\u3092\u4ed8\u3051\u3088\u3046<\/a><\/li><li><a href=\"#-Stringcontains\">\uff11-\uff15\uff0e\u6587\u5b57\u5217\u306e\u6709\u7121\u3092\u77e5\u308b\u306a\u3089String.contains\u3082\u4f7f\u304a\u3046<\/a><\/li><\/ul><\/li><li><a href=\"#Stringsubstring\">\uff12\uff0e\u3010\u5fdc\u7528\u3011String.substring\u3068\u306e\u7d44\u307f\u5408\u308f\u305b<\/a><\/li><li><a href=\"#StringindexOflastIndexOf\">\uff13\uff0e\u3010\u5fdc\u7528\u3011String.indexOf\/lastIndexOf\u306e\u6d3b\u7528\u4f8b<\/a><ul><li><a href=\"#i-2\">\uff13-\uff11\uff0e\u30d5\u30a1\u30a4\u30eb\u62e1\u5f35\u5b50\u3001\u30d5\u30a1\u30a4\u30eb\u540d\u90e8\u5206\u306e\u53d6\u5f97<\/a><\/li><li><a href=\"#i-3\">\uff13-\uff12\uff0e\u300c\u30d1\u30e9\u30e1\u30fc\u30bf\u540d=\u5024\u300d\u306e\u5206\u89e3<\/a><\/li><li><a href=\"#-CSV\">\uff13-\uff13\uff0eCSV\u306e\u5206\u89e3<\/a><\/li><\/ul><\/li><li><a href=\"#StringBuilderStringBufferindexOflastIndexOf\">\uff14\uff0e\u3010\u53c2\u8003\u3011StringBuilder\/StringBuffer\u306eindexOf\/lastIndexOf<\/a><\/li><li><a href=\"#i-4\">\uff15\uff0e\u307e\u3068\u3081<\/a><\/li><\/ul><\/div>\n<h2><span id=\"JavaStringindexOflastIndexOf\">\uff11\uff0e\u3010<span>Java\u3011<\/span>String.indexOf\/lastIndexOf\u306e\u4f7f\u3044\u65b9<\/span><\/h2>\n<h3><span id=\"-String\">\uff11-\uff11\uff0eString\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3068\u306f\u6587\u5b57\u5358\u4f4d\u306e\u4f4d\u7f6e<\/span><\/h3>\n<p>\u3053\u3053\u3067String.indexOf\/lastIndexOf\u3092\u4f7f\u3046\u305f\u3081\u306b\u5fc5\u8981\u306a\u3001String\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u8003\u3048\u65b9\u3092\u307e\u305a\u899a\u3048\u307e\u3057\u3087\u3046\u3002String\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3068\u306f\u3001\u6587\u5b57\u5217\u4e2d\u306b\u542b\u307e\u308c\u308b\u6587\u5b57\u306b\u9806\u756a\u306b\u5272\u308a\u5f53\u3066\u3089\u308c\u305f\u6570\u5b57\u3067\u3059\u3002<\/p>\n<p>\u6587\u5b57\u5217\u306e\u6700\u521d\u306e\u6587\u5b57\u304c\u30a4\u30f3\u30c7\u30c3\u30af\u30b9<span> 0 <\/span>\u3067\u3001\u9806\u756a\u306b<span>+1<\/span>\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u914d\u5217\u306e\u6dfb\u3048\u5b57\u3068\u540c\u3058\u30eb\u30fc\u30eb\u3067\u3059\u3002\u3067\u3059\u306e\u3067\u3001\u6700\u5f8c\u306e\u6587\u5b57\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u3001<span>String.length()<\/span>\u3088\u308a<span>1<\/span>\u5c11\u306a\u3044\u6570\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String str = \"\u3042\u3044\u3046\u3048\u304a\";\r\n\r\n\/\/ \u6587\u5b57\u5217\u3092\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3068\u4e00\u7dd2\u306b\u8868\u793a\r\nfor (int i = 0; i &lt; str.length(); i++) {\r\n\tSystem.out.println(String.format(\"str\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9 %d \u306f %s \u3067\u3059\u3002\", i, str.charAt(i)));\r\n}\r\n\r\n\u203b\u51fa\u529b\u7d50\u679c:\r\nstr\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9 0 \u306f \u3042 \u3067\u3059\u3002\r\nstr\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9 1 \u306f \u3044 \u3067\u3059\u3002\r\nstr\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9 2 \u306f \u3046 \u3067\u3059\u3002\r\nstr\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9 3 \u306f \u3048 \u3067\u3059\u3002\r\nstr\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9 4 \u306f \u304a \u3067\u3059\u3002<\/pre>\n<p><a href=\"https:\/\/www.bold.ne.jp\/engineer-club\/wp-content\/uploads\/2018\/10\/java-substring1.png\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/www.bold.ne.jp\/engineer-club\/wp-content\/uploads\/2018\/10\/java-substring1.png\" alt=\"String\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u8003\u3048\u65b9\u306f\u3053\u308c\u3060\uff01\" width=\"960\" height=\"720\" class=\"alignnone size-full wp-image-807\" srcset=\"https:\/\/www.bold.ne.jp\/engineer-club\/wp-content\/uploads\/2018\/10\/java-substring1.png 960w, https:\/\/www.bold.ne.jp\/engineer-club\/wp-content\/uploads\/2018\/10\/java-substring1-768x576.png 768w\" sizes=\"(max-width: 960px) 100vw, 960px\" \/><\/a><\/p>\n<p>\u306a\u304a\u3001<span>Java<\/span>\u3067\u306f<span>String<\/span>\u3092\u4f7f\u3046\u5834\u5408\u306f\u6587\u5b57\u6570\u3067\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u4ed6\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067<span>Shift_JIS<\/span>\u306a\u3069\u3092\u6271\u3046\u6642\u3068\u306f\u9055\u3044\u3001\u5404\u6587\u5b57\u306e<span>byte<\/span>\u6570\u306f\u610f\u8b58\u3057\u306a\u304f\u3066\u3082\u3088\u3044\u306e\u3067\u3001\u3044\u308f\u3086\u308b\u5168\u89d2\u30fb\u534a\u89d2\u306e\u6587\u5b57\u7a2e\u5224\u65ad\u7d50\u679c\u306b\u3088\u308b\u8abf\u6574\u3082\u4e0d\u8981\u3067\u3059\u3002<\/p>\n<h3><span id=\"-StringindexOf\">\uff11-\uff12\uff0eString.indexOf\u306f\u6587\u5b57\u30fb\u6587\u5b57\u5217\u3092\u524d\u304b\u3089\u63a2\u3059<\/span><\/h3>\n<p>\u3067\u306f\u3001<span>String.indexOf<\/span>\u304b\u3089\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<span>indexOf<\/span>\u306f\u3001<span>String<\/span>\u304c\u6301\u3064\u6587\u5b57\u5217\u306e\u524d\u304b\u3089\u3001\u6307\u5b9a\u3057\u305f\u6587\u5b57\u30fb\u6587\u5b57\u5217\u304c\u51fa\u73fe\u3059\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u623b\u3059\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/p>\n<p>\u623b\u308a\u5024\u3068\u3057\u3066\u306f\u3001\u6587\u5b57\u30fb\u6587\u5b57\u5217\u304c<span>String<\/span>\u4e2d\u306b\u3042\u308b\u5834\u5408\u306f\u305d\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u623b\u308a\u307e\u3059\u3002\u6587\u5b57\u30fb\u6587\u5b57\u5217\u304c\u306a\u3044\u5834\u5408\u306f<span>-1<\/span>\u304c\u623b\u308a\u307e\u3059\u3002<\/p>\n<p>indexOf\u306e\u57fa\u672c\u5f62\u306f\u3001\u4ee5\u4e0b\u306e<span>2<\/span>\u3064\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u3053\u308c\u3089\u306f\u63a2\u3059\u3082\u306e\u304c\u6587\u5b57\u4e00\u3064\u3060\u3051\u304b\u3001\u3042\u308b\u3044\u306f\u6587\u5b57\u5217\u304b\u304c\u9055\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">public int indexOf(int ch)\r\n\tch - \u6587\u5b57(Unicode\u30b3\u30fc\u30c9\u30fb\u30dd\u30a4\u30f3\u30c8)\u3002\r\npublic int indexOf(String str)\r\n\tstr - \u691c\u7d22\u5bfe\u8c61\u306e\u90e8\u5206\u6587\u5b57\u5217\u3002<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">String str = \"\u3042\u3044\u3046\u3048\u304a\"; \/\/ 0:\u3042 1:\u3044 2:\u3046 3:\u3048 4:\u304a\r\nSystem.out.println(str.indexOf('\u3046')); \/\/ \u2192 2\r\nSystem.out.println(str.indexOf(\"\u3046\")); \/\/ \u2192 2\r\nSystem.out.println(str.indexOf(\"\u3048\u304a\")); \/\/ \u2192 3\r\nSystem.out.println(str.indexOf('\u304b')); \/\/ \u2192 -1\u3001'\u304b'\u306fstr\u4e2d\u306b\u5b58\u5728\u3057\u306a\u3044\r\nSystem.out.println(str.indexOf(\"\u304b\")); \/\/ \u2192 -1\u3001\"\u304b\"\u306fstr\u4e2d\u306b\u5b58\u5728\u3057\u306a\u3044\r\nSystem.out.println(str.indexOf(\"\u3042\u304a\")); \/\/ \u2192 -1\u3001\"\u3042\u304a\"\u306fstr\u4e2d\u306b\u5b58\u5728\u3057\u306a\u3044<\/pre>\n<p>indexOf\u306e\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u3068\u3057\u3066\u3001\u6587\u5b57\u30fb\u6587\u5b57\u5217\u3092\u63a2\u3057\u59cb\u3081\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092<span>2<\/span>\u3064\u76ee\u306e\u5f15\u6570\u3067\u6307\u5b9a\u3067\u304d\u308b\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002\u5148\u307b\u3069\u7d39\u4ecb\u3057\u305f\u3082\u306e\u306f\u3001\u3053\u308c\u306b<span>0<\/span>\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u3082\u306e\u3068\u8003\u3048\u308c\u3070\u308f\u304b\u308a\u3084\u3059\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">public int indexOf(int ch, int fromIndex)\r\n\tch - \u6587\u5b57(Unicode\u30b3\u30fc\u30c9\u30fb\u30dd\u30a4\u30f3\u30c8)\u3002\r\n\tfromIndex - \u691c\u7d22\u958b\u59cb\u4f4d\u7f6e\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3002\r\npublic int indexOf(String str, int fromIndex)\r\n\tstr - \u691c\u7d22\u5bfe\u8c61\u306e\u90e8\u5206\u6587\u5b57\u5217\u3002\r\n\tfromIndex -\u691c\u7d22\u958b\u59cb\u4f4d\u7f6e\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3002<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">\/\/  0:\u3042  1:\u3044  2:\u3046  3:\u3048  4:\u304a\r\n\/\/  5:\u304b  6:\u304d  7:\u304f  8:\u3051  9:\u3053\r\n\/\/ 10:\u3042 11:\u3044 12:\u3046 13:\u3048 14:\u304a\r\nString str = \"\u3042\u3044\u3046\u3048\u304a\u304b\u304d\u304f\u3051\u3053\u3042\u3044\u3046\u3048\u304a\";\r\nSystem.out.println(str.indexOf('\u3046', 0)); \/\/ \u2192 2\r\nSystem.out.println(str.indexOf(\"\u3046\", 0)); \/\/ \u2192 2\r\nSystem.out.println(str.indexOf('\u3046', 4)); \/\/ \u2192 12\r\nSystem.out.println(str.indexOf(\"\u3046\", 4)); \/\/ \u2192 12\r\nSystem.out.println(str.indexOf(\"\u3048\u304a\", 4)); \/\/ \u2192 13<\/pre>\n<h3><span id=\"-StringlastIndexOf\">\uff11-\uff13\uff0eString.lastIndexOf\u306f\u6587\u5b57\u30fb\u6587\u5b57\u5217\u3092\u5f8c\u308d\u304b\u3089\u63a2\u3059<\/span><\/h3>\n<p>String.indexOf\u306f\u524d\u304b\u3089\u63a2\u3059\u3082\u306e\u3067\u3057\u305f\u304c\u3001<span>lastIndexOf<\/span>\u306f\u5f8c\u308d\u304b\u3089\u63a2\u3057\u307e\u3059\u3002\u3053\u308c\u3082<span>indexOf<\/span>\u3068\u540c\u69d8\u306b\u3001\u6587\u5b57\u30fb\u6587\u5b57\u5217\u306e\u9055\u3044\u3068\u3001\u63a2\u3057\u59cb\u3081\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u9055\u3044\u3067\u4ee5\u4e0b\u306e<span>4<\/span>\u7a2e\u985e\u304c\u3042\u308a\u307e\u3059\u3002\u623b\u308a\u5024\u3082\u3001\u898b\u3064\u304b\u3063\u305f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u623b\u308a\u3001\u898b\u3064\u304b\u3089\u306a\u304b\u3063\u305f\u5834\u5408\u306f<span>-1<\/span>\u304c\u623b\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">public int lastIndexOf(int ch)\r\n\tch - \u6587\u5b57(Unicode\u30b3\u30fc\u30c9\u30fb\u30dd\u30a4\u30f3\u30c8)\u3002\r\npublic int lastIndexOf(int ch, int fromIndex)\r\n\tch - \u6587\u5b57(Unicode\u30b3\u30fc\u30c9\u30fb\u30dd\u30a4\u30f3\u30c8)\u3002\r\n\tfromIndex - \u691c\u7d22\u958b\u59cb\u4f4d\u7f6e\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3002 \r\npublic int lastIndexOf(String str)\r\n\tstr - \u691c\u7d22\u5bfe\u8c61\u306e\u90e8\u5206\u6587\u5b57\u5217\u3002\r\npublic int lastIndexOf(String str, int fromIndex)\r\n\tstr - \u691c\u7d22\u5bfe\u8c61\u306e\u90e8\u5206\u6587\u5b57\u5217\u3002\r\n\tfromIndex - \u691c\u7d22\u958b\u59cb\u4f4d\u7f6e\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3002<\/pre>\n<p>\u4ee5\u4e0b\u306e\u4f8b\u3067\u3001\u5f8c\u308d\u304b\u3089\u63a2\u3057\u59cb\u3081\u308b\u3068\u3044\u3046\u3053\u3068\u3068\u3001\u63a2\u3057\u59cb\u3081\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u3069\u3046\u5f71\u97ff\u3059\u308b\u304b\u304c\u304a\u5206\u304b\u308a\u306b\u306a\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u3002\u958b\u59cb\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u672a\u6307\u5b9a\u306e\u3082\u306e\u306f\u3001\u4e00\u756a\u6700\u5f8c\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u6307\u5b9a\u3055\u308c\u3066\u3044\u308b\u3068\u8003\u3048\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">\/\/  0:\u3042  1:\u3044  2:\u3046  3:\u3048  4:\u304a\r\n\/\/  5:\u304b  6:\u304d  7:\u304f  8:\u3051  9:\u3053\r\n\/\/ 10:\u3042 11:\u3044 12:\u3046 13:\u3048 14:\u304a\r\nString str = \"\u3042\u3044\u3046\u3048\u304a\u304b\u304d\u304f\u3051\u3053\u3042\u3044\u3046\u3048\u304a\";\r\nSystem.out.println(str.lastIndexOf('\u3046')); \/\/ \u2192 12\u3001\u4e00\u756a\u5f8c\u308d\u304b\u3089\u63a2\u3057\u3066\u3044\u308b\u305f\u3081\r\nSystem.out.println(str.lastIndexOf(\"\u3046\")); \/\/ \u2192 12\r\nSystem.out.println(str.lastIndexOf('\u3046', 4)); \/\/ \u2192 2\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b94(=\u6700\u521d\u306e\"\u304a\")\u304b\u3089\u524d\u3092\u63a2\u3057\u3066\u3044\u308b\u305f\u3081\r\nSystem.out.println(str.lastIndexOf(\"\u3046\", 4)); \/\/ \u2192 2<\/pre>\n<h3><span id=\"i\">\uff11-\uff14\uff0e\u63a2\u3059\u6587\u5b57\u306f\u5927\u6587\u5b57\u30fb\u5c0f\u6587\u5b57\u304b\u3069\u3046\u304b\u306b\u6c17\u3092\u4ed8\u3051\u3088\u3046<\/span><\/h3>\n<p>Java\u306f<span>String<\/span>\u4e2d\u306b\u542b\u307e\u308c\u308b\u6587\u5b57\u306e\u5927\u6587\u5b57\u30fb\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3057\u307e\u3059\u3002<span>indexOf\/lastIndexOf<\/span>\u3082\u540c\u69d8\u306b\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3057\u307e\u3059\u306e\u3067\u3001\u63a2\u3057\u305f\u3044\u6587\u5b57\u5217\u304c\u898b\u3064\u304b\u3089\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String str = \"aBcDeFg\";\r\nSystem.out.println(str.indexOf('C')); \/\/ \u2192 -1\u3001\u5927\u6587\u5b57\u306ec\u306f\u542b\u307e\u308c\u3066\u3044\u306a\u3044\u305f\u3081\r\nSystem.out.println(str.indexOf('c')); \/\/ \u2192 2<\/pre>\n<p>\u6587\u5b57\u5217\u3092\u63a2\u3059\u6642\u306b\u5927\u6587\u5b57\u30fb\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3057\u305f\u304f\u306a\u3044\u306a\u3089\u3001String.toUpperCase\/toLowerCase\u3084Character\/toUpperCase\u30fbtoLowerCase\u3092\u4f7f\u3063\u3066\u3001\u6bd4\u8f03\u5148\u30fb\u5143\u306e\u6587\u5b57\u5217\u3092\u5927\u6587\u5b57\u304b\u5c0f\u6587\u5b57\u306e\u3069\u3061\u3089\u304b\u306b\u5909\u63db\u3057\u3066\u7d71\u4e00\u3057\u307e\u3057\u3087\u3046\u3002\u5909\u63db\u306f\u6bd4\u8f03\u5143\u30fb\u5148\u306e\u4e21\u65b9\u3067\u884c\u3046\u3068\u3088\u308a\u78ba\u5b9f\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String str = \"aBcDeFg\";\r\n\r\nString str1 = str.toLowerCase();\r\nchar c1 = Character.toLowerCase('C');\r\nSystem.out.println(str1); \/\/ \u2192 abcdefg\r\nSystem.out.println(c1); \/\/ \u2192 c\r\nSystem.out.println(str1.indexOf(c1)); \/\/ \u2192 2\r\nSystem.out.println(str1.indexOf('c')); \/\/ \u2192 2\r\nSystem.out.println(str1.indexOf('C')); \/\/ \u2192 -1\r\n\r\nString str2 = str.toUpperCase();\r\nchar c2 = Character.toUpperCase('c');\r\nSystem.out.println(str2); \/\/ \u2192 ABCDEFG\r\nSystem.out.println(c2); \/\/ \u2192 C\r\nSystem.out.println(str2.indexOf(c2)); \/\/ \u2192 2\r\nSystem.out.println(str2.indexOf('c')); \/\/ \u2192 -1\r\nSystem.out.println(str2.indexOf('C')); \/\/ \u2192 2<\/pre>\n<p>\u306a\u304a\u3001<span>toUpperCase\/toLowerCase<\/span>\u3092\u884c\u3063\u3066\u3082\u5143\u306e<span>String<\/span>\u306e\u5185\u5bb9\u306f\u5909\u308f\u308a\u307e\u305b\u3093\u306e\u3067\u3001<span>indexOf<\/span>\u3067\u53d6\u5f97\u3057\u305f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u305d\u306e\u307e\u307e\u4f7f\u3048\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String str = \"aBcDeFg\";\r\nString str1 = str.toLowerCase();\r\nSystem.out.println(str); \/\/ \u2192 aBcDeFg\r\nSystem.out.println(str1); \/\/ \u2192 abcdefg<\/pre>\n<h3><span id=\"-Stringcontains\">\uff11-\uff15\uff0e\u6587\u5b57\u5217\u306e\u6709\u7121\u3092\u77e5\u308b\u306a\u3089<span>String.contains<\/span>\u3082\u4f7f\u304a\u3046<\/span><\/h3>\n<p>\u524d\u8ff0\u306e\u3068\u304a\u308a\u3001<span>indexOf<\/span>\u3067\u306f<span>String<\/span>\u4e2d\u306b\u63a2\u3057\u305f\u3044\u6587\u5b57\u30fb\u6587\u5b57\u5217\u304c\u306a\u304b\u3063\u305f\u5834\u5408\u306f<span>-1<\/span>\u304c\u623b\u308b\u306e\u3067\u3001\u6587\u5b57\u30fb\u6587\u5b57\u5217\u306e\u6709\u7121\u3092\u8abf\u3079\u308b\u306e\u306b\u3082\u4f7f\u3048\u307e\u3059\u3002\u305d\u306e\u969b\u3001<span>String.contains<\/span>\u3092\u4f7f\u3048\u3070\u3001\u3042\u308b\u30fb\u306a\u3044\u3092<span>boolean<\/span>\u3067\u5f97\u3089\u308c\u308b\u306e\u3067\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u3088\u308a\u5206\u304b\u308a\u3084\u3059\u304f\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">public boolean contains(CharSequence s)<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">String str = \"ABCDEFG\";\r\n\r\nSystem.out.println(str.indexOf(\"C\")); \/\/ \u2192 2\r\nSystem.out.println(str.indexOf(\"\u3042\")); \/\/ \u2192 -1\r\nSystem.out.println(str.contains(\"C\")); \/\/ \u2192 true\r\nSystem.out.println(str.contains(\"\u3042\")); \/\/ \u2192 false\r\n\r\nif (str.indexOf(\"E\") != -1) {\r\n\tSystem.out.println(\"E\u306f\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002\");\r\n} else {\r\n\tSystem.out.println(\"E\u306f\u542b\u307e\u308c\u3066\u3044\u307e\u305b\u3093\u3002\");\r\n}\r\n\r\nif (str.contains(\"E\")) {\r\n\tSystem.out.println(\"E\u306f\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002\");\r\n} else {\r\n\tSystem.out.println(\"E\u306f\u542b\u307e\u308c\u3066\u3044\u307e\u305b\u3093\u3002\");\r\n}<\/pre>\n<p>\u305f\u3060\u3057\u3001<span>contains<\/span>\u306f\u958b\u59cb\u4f4d\u7f6e\u304c<span>0<\/span>\u306e<span>indexOf<\/span>\u3068\u540c\u3058\u52d5\u304d\u3092\u3059\u308b\u306e\u3067\u3001\u958b\u59cb\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u6307\u5b9a\u3067\u304d\u307e\u305b\u3093\u3002\u307e\u305f\u3001\u6587\u5b57\u7528\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u305b\u3093\u3002\u305d\u308c\u3089\u306e\u5236\u9650\u304c\u3042\u308b\u306a\u3089<span>indexOf<\/span>\u3092\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2><span id=\"Stringsubstring\">\uff12\uff0e\u3010\u5fdc\u7528\u3011<span>String.substring<\/span>\u3068\u306e\u7d44\u307f\u5408\u308f\u305b<\/span><\/h2>\n<p>indexOf\/lastIndexOf\u306f\u305d\u308c\u3060\u3051\u3060\u3068\u4f7f\u3044\u9053\u304c\u3042\u307e\u308a\u3042\u308a\u307e\u305b\u3093\u3002\u6700\u3082\u666e\u901a\u306e\u4f7f\u3044\u65b9\u306f<span>String.substring<\/span>\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u3059\u3002<span>substring<\/span>\u306f<span>String<\/span>\u304b\u3089\u90e8\u5206\u6587\u5b57\u5217\u3092\u5207\u308a\u51fa\u3059\u30e1\u30bd\u30c3\u30c9\u3067\u3001\u3053\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3068\u3057\u3066<span>indexOf\/lastIndexOf<\/span>\u306e\u623b\u308a\u5024\u3092\u4f7f\u3046\u306e\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">public String substring(int beginIndex)\r\n\tbeginIndex - \u958b\u59cb\u30a4\u30f3\u30c7\u30c3\u30af\u30b9(\u3053\u306e\u5024\u3092\u542b\u3080)\u3002\r\npublic String substring(int beginIndex, int endIndex)\r\n\tbeginIndex - \u958b\u59cb\u30a4\u30f3\u30c7\u30c3\u30af\u30b9(\u3053\u306e\u5024\u3092\u542b\u3080)\u3002\r\n\tendIndex - \u7d42\u4e86\u30a4\u30f3\u30c7\u30c3\u30af\u30b9(\u3053\u306e\u5024\u3092\u542b\u307e\u306a\u3044)\u3002<\/pre>\n<p>\u4f8b\u3048\u3070\u3001<span>String<\/span>\u4e2d\u304b\u3089\u3068\u3042\u308b\u6587\u5b57\u5217\u3092\u63a2\u3057\u3001\u305d\u3053\u304b\u3089\u5f8c\u308d\u306e\u3059\u3079\u3066\u306e\u6587\u5b57\u5217\u3092\u53d6\u5f97\u3057\u305f\u308a\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306b\u3001<span>indexOf\/lastIndexOf<\/span>\u3068<span>substring<\/span>\u306f\u4f7f\u3044\u52dd\u624b\u304c\u3044\u3044\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ \"\u3046\u3048\"\u304b\u3089\u5f8c\u308d\u306e\u6587\u5b57\u5217\u3092\u3059\u3079\u3066\u53d6\u5f97\u3059\u308b\r\nString str = \"\u3042\u3044\u3046\u3048\u304a\";\r\nint index = str.indexOf(\"\u3046\u3048\");\r\nString substr = str.substring(index);\r\nSystem.out.println(substr); \/\/ \u2192 \u3046\u3048\u304a<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ \"\u3048\"\u304b\u3089\"\u3051\"\u307e\u3067\u306b\u3042\u308b\u6587\u5b57\u5217\u3092\u3059\u3079\u3066\u53d6\u5f97\u3059\u308b\r\nString str = \"\u3042\u3044\u3046\u3048\u304a\u304b\u304d\u304f\u3051\u3053\";\r\nint beginIndex = str.indexOf(\"\u3048\");\r\nint endIndex = str.indexOf(\"\u3051\");\r\nString substr = str.substring(beginIndex, endIndex);\r\nSystem.out.println(substr); \/\/ \u2192 \u3048\u304a\u304b\u304d\u304f<\/pre>\n<h2><span id=\"StringindexOflastIndexOf\">\uff13\uff0e\u3010\u5fdc\u7528\u3011String.indexOf\/lastIndexOf\u306e\u6d3b\u7528\u4f8b<\/span><\/h2>\n<h3><span id=\"i-2\">\uff13-\uff11\uff0e\u30d5\u30a1\u30a4\u30eb\u62e1\u5f35\u5b50\u3001\u30d5\u30a1\u30a4\u30eb\u540d\u90e8\u5206\u306e\u53d6\u5f97<\/span><\/h3>\n<p>String.substring()\u3068String.lastIndexOf()\u306e\u4f8b\u3068\u3057\u3066\u3001\u30d5\u30a1\u30a4\u30eb\u306e\u62e1\u5f35\u5b50\u3092\u5f97\u308b\u969b\u306b\u4f7f\u3048\u307e\u3059\u3002\u62e1\u5f35\u5b50\u3092\u9664\u304f\u90e8\u5206\u304c\u5fc5\u8981\u306a\u5834\u5408\u3082\u540c\u3058\u8003\u3048\u65b9\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String fileName = \"FILE.NAME.txt\";\r\nint endIndex = fileName.lastIndexOf('.'); \/\/ \u6700\u5f8c\u306e'.'\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u691c\u7d22\r\nString extName = fileName.substring(endIndex + 1); \/\/ \u2192 \"txt\"\u3001\u4e00\u756a\u6700\u5f8c\u306e'.'\u304b\u3089\u5f8c\u308d\u306e\u6587\u5b57\u5217\u3092\u5168\u3066\u53d6\u5f97\r\nString baseName = fileName.substring(0, endIndex); \/\/ \u2192 \"FILE.NAME\"\u3001\u5148\u982d\u304b\u3089\u4e00\u756a\u6700\u5f8c\u306e'.'\u306e\u524d\u307e\u3067\u306e\u90e8\u5206\u6587\u5b57\u5217<\/pre>\n<p>\u30d5\u30a1\u30a4\u30eb\u306e\u30d1\u30b9\u304b\u3089\u30d5\u30a1\u30a4\u30eb\u540d\u3060\u3051\u629c\u304d\u51fa\u3057\u305f\u3044\u5834\u5408\u3082\u8003\u3048\u65b9\u306f\u540c\u3058\u3067\u3059\u3002\u533a\u5207\u308a\u6587\u5b57\u3092\u5909\u3048\u308b\u3060\u3051\u3067\u3059\u306d\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String pathName = \"\/A\/B\/FILE.NAME.txt\";\r\nint endIndex = pathName.lastIndexOf('\/'); \/\/ \u6700\u5f8c\u306e'\/'\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u691c\u7d22\r\nString fileName = pathName.substring(endIndex + 1); \/\/ \u2192 \"FILE.NAME.txt\"<\/pre>\n<h3><span id=\"i-3\">\uff13-\uff12\uff0e\u300c\u30d1\u30e9\u30e1\u30fc\u30bf\u540d<span>=<\/span>\u5024\u300d\u306e\u5206\u89e3<\/span><\/h3>\n<p>\u4f8b\u3048\u3070\u3001\u4f55\u304b\u306e\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u306b<span>&#8220;ABC=123&#8221;<\/span>\u3068\u3042\u3063\u305f\u5834\u5408\u306b\u3001<span>&#8220;=&#8221;<\/span>\u306e\u5de6\u5074\u306e\u5909\u6570\u540d\u3068\u53f3\u5074\u306e\u5024\u3092\u305d\u308c\u305e\u308c\u53d6\u308a\u51fa\u3057\u305f\u3044\u3068\u3057\u307e\u3059\u3002<span>Java<\/span>\u306e\u5834\u5408\u3001\u3084\u308a\u65b9\u306f\u8272\u3005\u3042\u308a\u307e\u3059\u304c\u3001<span>indexOf<\/span>\u3092\u4f7f\u3046\u306a\u3089\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String str = \"ABC=123\";\r\nString separator = \"=\";\r\nint index = str.indexOf(separator);\r\nString name = str.substring(0, index); \/\/ \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u524d\u307e\u3067\u304c\u540d\u524d\r\nString value = str.substring(index + separator.length()); \/\/ \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u5f8c\u308d\u304b\u3089\u304c\u5024\r\nSystem.out.println(\"name\u2192\" + name);\r\nSystem.out.println(\"value\u2192\" + value);<\/pre>\n<p>\u4f3c\u305f\u3088\u3046\u306a\u7528\u9014\u306b\u4f7f\u3048\u308b<span>String.split<\/span>\u3060\u3068\u3001\u5f15\u6570\u306b\u6c17\u3092\u4ed8\u3051\u306a\u3044\u3068\u5024\u5074\u306b<span>&#8220;=&#8221;<\/span>\u304c\u542b\u307e\u308c\u3066\u3044\u305f\u5834\u5408\u306b\u3082\u5206\u89e3\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u5206\u89e3\u3057\u305f\u3044\u306e\u306f\u300c\u6700\u521d\u306b\u300d\u51fa\u73fe\u3059\u308b<span>&#8220;=&#8221;<\/span>\u306e\u5de6\u53f3\u3060\u3051\u3067\u3001\u53f3\u5074\u306b\u3042\u308b\u5024\u306f\u305d\u306e\u307e\u307e\u6b32\u3057\u3044\u306e\u3067\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u7528\u9014\u306b\u306f<span>indexOf<\/span>\u3092\u4f7f\u3046\u3068\u30b7\u30f3\u30d7\u30eb\u306b\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String str = \"ABC=123=456\";\r\nString[] strArr = str.split(\"=\");\r\nSystem.out.println(Arrays.toString(strArr)); \/\/ \u2192 [ABC, 123, 456]\r\n\r\n\/\/ \u305f\u3060\u3057\u3001limit\u4ed8\u306esplit\u306a\u3089\u5927\u4e08\u592b!!\r\nString[] strArr2 = str.split(\"=\", 2);\r\nSystem.out.println(Arrays.toString(strArr2)); \/\/ \u2192 [ABC, 123=456]<\/pre>\n<h3><span id=\"-CSV\">\uff13-\uff13\uff0eCSV\u306e\u5206\u89e3<\/span><\/h3>\n<p>CSV(comma-separated values)\u306a\u3069\u306e\u3001\u7279\u5b9a\u306e\u533a\u5207\u308a\u6587\u5b57\u3067\u9023\u7d50\u3057\u305f\u6587\u5b57\u5217\u304b\u3089\u3001\u5404\u8981\u7d20\u3092\u629c\u304d\u51fa\u3059\u6642\u306b\u3082String.indexOf()\u306f\u4f7f\u3048\u307e\u3059\u3002\u7c21\u5358\u306b\u884c\u3046\u306a\u3089<span>String.split<\/span>\u3067\u3044\u3044\u306e\u3067\u3059\u304c\u3001\u533a\u5207\u308a\u6587\u5b57\u304c<span>&#8220;&#8221;<\/span>\u3067\u56f2\u307e\u308c\u3066\u3044\u308b\u5834\u5408\u306a\u3069\u5358\u7d14\u306b\u51e6\u7406\u51fa\u6765\u306a\u3044\u5834\u5408\u3082\u3042\u308b\u306e\u3067\u3001\u3053\u308c\u3092\u30d9\u30fc\u30b9\u306b\u62e1\u5f35\u3057\u305f\u308a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String csvStr = \"A,\u3042\u3044\u3046\u3048\u304a,,C,1234\";\r\nList&lt;String&gt; csvElements = new ArrayList&lt;&gt;();\r\nint beginIndex = 0;\r\n\r\nwhile (true) {\r\n\tint endIndex = csvStr.indexOf(',', beginIndex);\r\n\r\n\tif (endIndex == -1) {\r\n\t\tcsvElements.add(csvStr.substring(beginIndex));\r\n\t\tbreak;\r\n\t} else {\r\n\t\tcsvElements.add(csvStr.substring(beginIndex, endIndex));\r\n\t\tbeginIndex = endIndex + 1;\r\n\t}\r\n}<\/pre>\n<h2><span id=\"StringBuilderStringBufferindexOflastIndexOf\">\uff14\uff0e\u3010\u53c2\u8003\u3011StringBuilder\/StringBuffer\u306eindexOf\/lastIndexOf<\/span><\/h2>\n<p>String\u3092\u4f5c\u308b\u969b\u306fStringBuilder\/StringBuffer\u3092\u4f7f\u3046\u3053\u3068\u304c\u591a\u3044\u3068\u601d\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u3082<span>String<\/span>\u7248\u306e\u307f\u3067\u3059\u304c<span>indexOf\/lastIndexOf<\/span>\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u306e\u3067\u3001<span>String<\/span>\u3092\u4f5c\u3063\u3066\u3044\u308b\u6700\u4e2d\u306b\u3082<span>StringBuilder\/StringBuffer<\/span>\u5185\u306b\u6587\u5b57\u30fb\u6587\u5b57\u5217\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u8abf\u3079\u3089\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">StringBuilder sb = new StringBuilder(\"\u3042\u3044\u3046\u3048\u304a\");\r\nSystem.out.println(sb.indexOf(\"\u3046\")); \/\/ \u2192 2\r\nSystem.out.println(sb.indexOf(\"\u304b\")); \/\/ \u2192 -1\r\nSystem.out.println(sb.lastIndexOf(\"\u3048\")); \/\/ \u2192 3\r\nSystem.out.println(sb.lastIndexOf(\"\u304b\")); \/\/ \u2192 -1<\/pre>\n<p>\u3061\u306a\u307f\u306b\u3001substring\u3082String\u3068\u540c\u3058\u3088\u3046\u306b\u4f7f\u3048\u307e\u3059\u306e\u3067\u3001\u307b\u307cString\u3068\u540c\u3058\u3088\u3046\u306b\u3092\u6271\u3048\u308b\u306e\u3067\u3059\u306d\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">StringBuilder sb = new StringBuilder(\"\u3042\u3044\u3046\u3048\u304a\");\r\nint index = sb.indexOf(\"\u3046\");\r\nString substr = sb.substring(index, index + 2);\r\nSystem.out.println(substr); \/\/ \u2192 \u3046\u3048\r\nString substr2 = sb.substring(index);\r\nSystem.out.println(substr2); \/\/ \u2192 \u3046\u3048\u304a<\/pre>\n<h2><span id=\"i-4\">\uff15\uff0e\u307e\u3068\u3081<\/span><\/h2>\n<p>String.indexOf\/lastIndexOf\u306f\u3001<span>String<\/span>\u304b\u3089\u6307\u5b9a\u3057\u305f\u6587\u5b57\u30fb\u6587\u5b57\u5217\u304c\u51fa\u73fe\u3059\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u5f97\u308b\u306e\u306b\u4f7f\u3044\u307e\u3059\u3002\u5148\u982d\u304b\u3089\u63a2\u3059\u306b\u306f<span>indexOf<\/span>\u3001\u6700\u5f8c\u304b\u3089\u63a2\u3059\u306b\u306f<span>lastIndexOf<\/span>\u3067\u3059\u3002\u3055\u3089\u306b\u3001\u63a2\u3057\u59cb\u3081\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u6307\u5b9a\u3067\u304d\u308b\u30e1\u30bd\u30c3\u30c9\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>String.indexOf\/lastIndexOf\u3092\u4f7f\u3046\u969b\u306f\u3001\u5927\u62b5<span>String.substring<\/span>\u3068\u30bb\u30c3\u30c8\u306b\u306a\u308a\u307e\u3059\u3002<span>indexOf\/lastIndexOf<\/span>\u3067\u63a2\u3057\u3066\u3044\u308b\u6587\u5b57\u30fb\u6587\u5b57\u5217\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u63a2\u3057\u3001<span>substring<\/span>\u3067\u5207\u308a\u51fa\u3059\u2026\u304c\u826f\u304f\u898b\u3089\u308c\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n<p>indexOf\/lastIndexOf\u306f\u305d\u308c\u3060\u3051\u3067\u306f\u5358\u7d14\u306a\u6a5f\u80fd\u3057\u304b\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u4ed6\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u6587\u5b57\u5217\u306e\u8272\u3005\u306a\u89e3\u6790\u306b\u4f7f\u3048\u307e\u3059\u3002\u57fa\u672c\u3092\u3057\u3063\u304b\u308a\u899a\u3048\u3066\u3001\u4fbf\u5229\u306b\u4f7f\u3044\u307e\u3057\u3087\u3046\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>String.indexOf\/lastIndexOf\u306f\u3001\u6307\u5b9a\u3057\u305f\u6587\u5b57\u30fb\u6587\u5b57\u5217\u304cString\u4e2d\u306b\u51fa\u73fe\u3059\u308b\u4f4d\u7f6e(\u30a4\u30f3\u30c7\u30c3\u30af\u30b9)\u3092\u623b\u3059\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002 Java\u3067\u306e\u6587\u5b57\u5217\u64cd\u4f5c\u3067\u306f\u57fa\u672c\u306e\u4e00\u3064\u3067\u3059\u306e\u3067\u3001\u3057\u3063\u304b\u308a\u899a\u3048\u307e\u3057\u3087\u3046\u3002 \u3053\u306e\u8a18 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":804,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[14],"acf":[],"_links":{"self":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/936"}],"collection":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/comments?post=936"}],"version-history":[{"count":7,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/936\/revisions"}],"predecessor-version":[{"id":5698,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/936\/revisions\/5698"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/media\/804"}],"wp:attachment":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/media?parent=936"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/categories?post=936"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}