{"id":6404,"date":"2026-02-03T11:37:41","date_gmt":"2026-02-03T02:37:41","guid":{"rendered":"https:\/\/www.bold.ne.jp\/engineer-club\/?p=6404"},"modified":"2026-01-28T16:18:06","modified_gmt":"2026-01-28T07:18:06","slug":"java-substring-2","status":"publish","type":"post","link":"https:\/\/www.bold.ne.jp\/engineer-club\/java-substring-2","title":{"rendered":"Java\u306e\u6587\u5b57\u5217\u306e\u5207\u308a\u51fa\u3057\u65b9\u2015\u5834\u6240\u3092\u6307\u5b9a\u3057\u3066\u306e\u5207\u308a\u51fa\u3057\u304b\u3089\u6587\u5b57\u3092\u6307\u5b9a\u3057\u3066\u306e\u5207\u308a\u51fa\u3057\u307e\u3067"},"content":{"rendered":"<p>Java\u3067\u306f\u6587\u5b57\u5217\u3092\u5207\u308a\u51fa\u3059\u969b\u306bsubstring\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<br \/>\nsubstring\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u5834\u6240\u3092\u6307\u5b9a\u3057\u3066\u306e\u5207\u308a\u51fa\u3057\u3084\u7279\u5b9a\u306e\u6587\u5b57\u306e\u5207\u308a\u51fa\u3057\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n\u3053\u306e\u30da\u30fc\u30b8\u3067\u306f\u3001\u6587\u5b57\u5217\u306e\u5207\u308a\u51fa\u3057\u306e\u57fa\u672c\u3092\u4f8b\u6587\u3092\u4ea4\u3048\u3066\u8a18\u8f09\u3057\u3066\u3044\u304d\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=\"#substring\">\uff11\uff0esubstring\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u672c\u69cb\u6587<\/a><\/li><li><a href=\"#i\">\uff12\uff0e\u6307\u5b9a\u3057\u305f\u5834\u6240\u306e\u6587\u5b57\u3092\u5207\u308a\u51fa\u3059\u65b9\u6cd5<\/a><\/li><li><a href=\"#i-2\">\uff13\uff0e\u6700\u5f8c\u304b\u3089\u6307\u5b9a\u3057\u305f\u6587\u5b57\u6570\u3092\u5207\u308a\u51fa\u3059\u65b9\u6cd5<\/a><\/li><li><a href=\"#i-3\">\uff14\uff0e\u6307\u5b9a\u3057\u305f\u6587\u5b57\u3092\u542b\u3080\u90e8\u5206\u3092\u5207\u308a\u51fa\u3059\u65b9\u6cd5<\/a><\/li><li><a href=\"#i-4\">\uff15\uff0e\u3055\u3044\u3054\u306b<\/a><\/li><\/ul><\/div>\n<h2><span id=\"substring\">\uff11\uff0esubstring\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u672c\u69cb\u6587<\/span><\/h2>\n<p>java\u3067\u306f\u6587\u5b57\u5217\u3092\u5207\u308a\u51fa\u3059\u969b\u306bsubstring\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<br \/>\nSubstring\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u672c\u69cb\u6587\u306f\u4e0b\u8a18\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<p><strong><span class=\"f-marker-p\">\u6587\u5b57\u5217.substring(\u958b\u59cb\u4f4d\u7f6e, \u7d42\u4e86\u4f4d\u7f6e)<\/span><\/strong><\/p>\n<p>\u7d42\u4e86\u4f4d\u7f6e\u3092\u7701\u7565\u3059\u308b\u3068\u3001\u6587\u5b57\u5217\u306e\u6700\u5f8c\u307e\u3067\u5207\u308a\u51fa\u3057\u307e\u3059\u3002<br \/>\n\u4ee5\u4e0b\u306e\u7ae0\u3067\u306f\u4f8b\u6587\u3092\u4ea4\u3048\u3066substring\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9\u3092\u8a18\u8f09\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h2><span id=\"i\">\uff12\uff0e\u6307\u5b9a\u3057\u305f\u5834\u6240\u306e\u6587\u5b57\u3092\u5207\u308a\u51fa\u3059\u65b9\u6cd5<\/span><\/h2>\n<p>\u958b\u59cb\u4f4d\u7f6e\u3068\u7d42\u4e86\u4f4d\u7f6e\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u6307\u5b9a\u3057\u305f\u5834\u6240\u306e\u6587\u5b57\u3092\u5207\u308a\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n\u300cHello,World.\u300d\u306e\u5834\u5408\u3001\u4e0b\u8a18\u306e\u3088\u3046\u306b\u6587\u5b57\u306e\u9593\u306b\u6570\u5b57\u304c\u3042\u308b\u30a4\u30e1\u30fc\u30b8\u3092\u3057\u3066\u3001\u6307\u5b9a\u3057\u305f\u6570\u5b57\u306e\u9593\u306e\u6587\u5b57\u3092\u5207\u308a\u51fa\u3057\u307e\u3059\u3002<br \/>\n\u958b\u59cb\u4f4d\u7f6e\u304c6\u3067\u7d42\u4e86\u4f4d\u7f6e\u304c10\u306e\u5834\u5408\u306f\u300cWorl\u300d\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>(0)H(1)e(2)l(3)l(4)o(5),(6)W(7)o(8)r(9)l(10)d(11).(12)<\/p>\n<pre class=\"prettyprint lang:default decode:true\">public class Main {\r\n\tpublic static void main(String[] args) {\r\n\t\tString str =\"Hello,World.\";\r\n\t\t\r\n\t\tSystem.out.println(str.substring(6,9));\r\n\t}\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Worl<\/pre>\n<p>\u7d42\u4e86\u4f4d\u7f6e\u3092\u6307\u5b9a\u3057\u306a\u3044\u5834\u5408\u306f\u3001\u958b\u59cb\u4f4d\u7f6e\u304b\u3089\u6700\u5f8c\u307e\u3067\u5207\u308a\u51fa\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">\t\tString str =\"Hello,World.\";\r\n\t\tSystem.out.println(str.substring(6));\r\n<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"prettyprint lang:default decode:true\">World.<\/pre>\n<h2><span id=\"i-2\">\uff13\uff0e\u6700\u5f8c\u304b\u3089\u6307\u5b9a\u3057\u305f\u6587\u5b57\u6570\u3092\u5207\u308a\u51fa\u3059\u65b9\u6cd5<\/span><\/h2>\n<p>\u6700\u5f8c\u304b\u3089\u6307\u5b9a\u3057\u305f\u6587\u5b57\u6570\u3092\u5207\u308a\u51fa\u3059\u5834\u5408\u306f\u3001\u6587\u5b57\u5217\u306e\u9577\u3055\u3092\u5229\u7528\u3057\u307e\u3059\u3002<br \/>\n\u958b\u59cb\u4f4d\u7f6e\u3092\u300c\u6587\u5b57\u5217\u306e\u9577\u3055-\u6587\u5b57\u6570\u300d\u306b\u3059\u308b\u3053\u3068\u3067\u3001\u6700\u5f8c\u304b\u3089\u6307\u5b9a\u3057\u305f\u6587\u5b57\u6570\u3092\u5207\u308a\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n<strong><\/strong><span class=\"f-marker-p\"><strong>\u6587\u5b57\u5217\u306e\u9577\u3055\u306f\u300c\u6587\u5b57\u5217.length\u300d\u3067\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002<\/strong><\/span><br \/>\n\u4ee5\u4e0b\u306f\u6700\u5f8c\u304b\u30894\u6587\u5b57\u3092\u5207\u308a\u51fa\u3059\u4f8b\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String str =\"Hello,World.\";\r\nSystem.out.println(str.substring(str.length()-4));\r\n<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"prettyprint lang:default decode:true\">rld.<\/pre>\n<h2><span id=\"i-3\">\uff14\uff0e\u6307\u5b9a\u3057\u305f\u6587\u5b57\u3092\u542b\u3080\u90e8\u5206\u3092\u5207\u308a\u51fa\u3059\u65b9\u6cd5<\/span><\/h2>\n<p>\u300c\u6587\u5b57\u5217.indexOf\uff08\u691c\u7d22\u6587\u5b57\uff09\u300d\u3067\u691c\u7d22\u6587\u5b57\u306e\u5834\u6240\u3092\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002<br \/>\n\u691c\u7d22\u7d50\u679c\u304c\u8907\u6570\u3042\u308b\u5834\u5408\u306f\u6700\u521d\u306e\u5834\u6240\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002<br \/>\n\u3053\u306e<span class=\"f-marker-p\">indexOf\u30e1\u30bd\u30c3\u30c9\u3068substring\u30e1\u30bd\u30c3\u30c9\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u6307\u5b9a\u3057\u305f\u6587\u5b57\u3092\u542b\u3080\u90e8\u5206\u3092\u5207\u308a\u51fa\u305b\u307e\u3059\u3002<\/span><br \/>\n\u4ee5\u4e0b\u306f\u300cor\u300d\u304b\u30893\u6587\u5b57\u6587\u3092\u5207\u308a\u51fa\u3059\u4f8b\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">\t\tString str =\"Hello,World.\";\r\n\t\tint start = str.indexOf(\"or\");\r\n\t\tSystem.out.println(str.substring(start, start+3));\r\n<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"prettyprint lang:default decode:true\">orl<\/pre>\n<p>\u958b\u59cb\u4f4d\u7f6e\u30920\u306b\u3057\u3066\u7d42\u4e86\u4f4d\u7f6e\u3092\u691c\u7d22\u7d50\u679c\u306b\u3059\u308b\u3053\u3068\u3067\u3001\u6700\u521d\u304b\u3089\u691c\u7d22\u6587\u5b57\u306e\u524d\u307e\u3067\u3092\u5207\u308a\u51fa\u305b\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">System.out.println(str.substring(0, str.indexOf(\"or\")));<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Hello,W<\/pre>\n<h2><span id=\"i-4\">\uff15\uff0e\u3055\u3044\u3054\u306b<\/span><\/h2>\n<p>substring\u30e1\u30bd\u30c3\u30c9\u3092\u7528\u3044\u308b\u3053\u3068\u3067\u6587\u5b57\u5217\u306e\u5207\u308a\u51fa\u3057\u304c\u884c\u3048\u307e\u3059\u3002<br \/>\n\u7279\u5b9a\u306e\u6587\u5b57\u306e\u5207\u308a\u51fa\u3057\u306a\u3069\u72b6\u6cc1\u306b\u5fdc\u3058\u3066\u4f7f\u3044\u5206\u3051\u3089\u308c\u308b\u3088\u3046\u306b\u3001\u4eca\u56de\u306e\u5185\u5bb9\u3092\u3057\u3063\u304b\u308a\u62bc\u3055\u3048\u3066\u3082\u3089\u3048\u308c\u3070\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u306f\u6587\u5b57\u5217\u3092\u5207\u308a\u51fa\u3059\u969b\u306bsubstring\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002 substring\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u5834\u6240\u3092\u6307\u5b9a\u3057\u3066\u306e\u5207\u308a\u51fa\u3057\u3084\u7279\u5b9a\u306e\u6587\u5b57\u306e\u5207\u308a\u51fa\u3057\u304c\u3067\u304d\u307e\u3059\u3002 \u3053\u306e\u30da\u30fc\u30b8\u3067\u306f\u3001\u6587\u5b57\u5217\u306e\u5207\u308a\u51fa\u3057\u306e\u57fa\u672c\u3092\u4f8b\u6587\u3092 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":4270,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[14,11],"acf":[],"_links":{"self":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/6404"}],"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\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/comments?post=6404"}],"version-history":[{"count":6,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/6404\/revisions"}],"predecessor-version":[{"id":6410,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/6404\/revisions\/6410"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/media\/4270"}],"wp:attachment":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/media?parent=6404"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/categories?post=6404"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}