{"id":20546,"date":"2017-03-30T23:21:52","date_gmt":"2017-03-30T14:21:52","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=20546"},"modified":"2025-12-26T15:01:11","modified_gmt":"2025-12-26T06:01:11","slug":"%e3%80%90java%e5%85%a5%e9%96%80%e3%80%91string%e6%96%87%e5%ad%97%e5%88%97%e3%82%af%e3%83%a9%e3%82%b9%e7%b7%8f%e3%81%be%e3%81%a8%e3%82%81","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/20546","title":{"rendered":"\u3010Java String\u30117\u3064\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3067\u6587\u5b57\u5217\u64cd\u4f5c\u3092\u7406\u89e3\u3057\u3088\u3046"},"content":{"rendered":"\n<p><div class=\"box_voice\">Java\u306eString\u30af\u30e9\u30b9\u306e\u4f7f\u3044\u65b9\u3092\u57fa\u790e\u304b\u3089\u5b66\u3073\u305f\u3044<br>\u6587\u5b57\u5217\u306e\u5224\u5b9a\u3084\u5206\u5272\u3001\u9023\u7d50\u306a\u3069\u306e\u65b9\u6cd5\u304c\u308f\u304b\u3089\u306a\u3044\u2026<br>\u6587\u5b57\u5217\u306e\u691c\u7d22\u3084\u6574\u5f62\u306e\u65b9\u6cd5\u304c\u308f\u304b\u3089\u306a\u3044\u2026<\/div><\/p>\n\n\n\n<p>J<b>ava\u3067\u6587\u5b57\u5217\u3092\u6271\u3046String\u30af\u30e9\u30b9<\/b>\u306f\u3001\u5358\u306b\u6587\u5b57\u5217\u3092\u6271\u3046\u3060\u3051\u3067\u306a\u304f\u3001\u6587\u5b57\u5217\u306b\u5bfe\u3057\u3066\u3055\u307e\u3056\u307e\u306a\u64cd\u4f5c\u3092\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u3093\u306b\u3061\u306f\uff01\u30d5\u30ea\u30fc\u30e9\u30f3\u30b9\u306e\u30aa\u30fc\u30bf\u30b1\u3067\u3059\u3002String\u30af\u30e9\u30b9\u3068\u3044\u3048\u3070Java\u3067\u983b\u7e41\u306b\u4f7f\u3046\u30af\u30e9\u30b9\u306e\u4e00\u3064\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001String\u30af\u30e9\u30b9\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u77e5\u308a\u305f\u3044\u65b9\u306e\u305f\u3081\u306b\u3001\u4ee5\u4e0b\u306e\u5185\u5bb9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n<div class=\"box01\">\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>String\u3068\u306f<\/b><\/li>\n\n\n\n<li><b>\u6587\u5b57\u5217\u304c\u7a7a\u3001\u3082\u3057\u304f\u306fnull\u304b\u3069\u3046\u304b<\/b><\/li>\n\n\n\n<li><b>\u6587\u5b57\u5217\u306e\u5206\u5272\u30fb\u9023\u7d50\u30fb\u5207\u308a\u51fa\u3057\u30fb\u7a7a\u767d\u524a\u9664<\/b><\/li>\n\n\n\n<li><b>\u6587\u5b57\u5217\u306e\u691c\u7d22<\/b><\/li>\n\n\n\n<li><b>\u6587\u5b57\u5217\u306e\u6574\u5f62<\/b><\/li>\n\n\n\n<li><b>\u6587\u5b57\u30b3\u30fc\u30c9\u3068\u30d0\u30a4\u30c8\u914d\u5217<\/b><\/li>\n\n\n\n<li><b>\u6b63\u898f\u8868\u73fe\u3067\u30de\u30c3\u30c1\u30f3\u30b0\u3001\u7f6e\u63db<\/b><\/li>\n\n\n\n<li><b>String\u578b\u3068\u95a2\u9023\u3059\u308b\u30af\u30e9\u30b9<\/b><\/li>\n<\/ul>\n\n\n<\/div>\n\n\n\n<p>\u4eca\u56de\u306fString\u30af\u30e9\u30b9\u306b\u3064\u3044\u3066\u3001\u66f8\u304d\u65b9\u304b\u30897\u3064\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u307e\u3067\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u307e\u3059\uff01\u306a\u304a\u3001Java\u306e\u8a18\u4e8b\u306b\u3064\u3044\u3066\u306f\u3001<a href=\"https:\/\/www.sejuku.net\/blog\/148098\" target=\"_blank\" rel=\"noopener\">\u3053\u3061\u3089<\/a>\u306b\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"u-mb-ctrl u-mb-10\">\u300c\u72ec\u5b66\u3068\u4e26\u884c\u3057\u306a\u304c\u3089\u3001\u8ee2\u8077\u6d3b\u52d5\u3067\u304d\u308b\u304b\u306a&#8230;\u300d<\/p>\n\n<p class=\"u-mb-ctrl u-mb-10\">\u305d\u3093\u306a\u4e0d\u5b89\u3092\u62b1\u3048\u3066\u3044\u308b\u4eba\u306f\u3001\u305c\u3072\u300c<strong><a href=\"https:\/\/lp.sejuku.net\/lp1_blog_02\/?cid=lp_text_cta\">\u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2<\/a><\/strong>\u300d\u3092\u304a\u8a66\u3057\u304f\u3060\u3055\u3044\u3002<\/p>\n\n<p class=\"u-mb-ctrl u-mb-10\">\u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u3067\u306f\u3001\u73fe\u5f79\u30a8\u30f3\u30b8\u30cb\u30a2\u3068\u5b66\u7fd2\u30b3\u30fc\u30c1\u306e<strong><span class=\"swl-marker mark_yellow\"><strong><span class=\"swl-marker mark_yellow\">2\u540d\u4f53\u5236<\/span><\/strong>\u3067<\/span>\u5b66\u7fd2\u3092\u30b5\u30dd\u30fc\u30c8\u3002<\/strong>\u5c31\u696d\u6d3b\u52d5\u3082IT\u4f01\u696d\u3067\u4eba\u4e8b\u7d4c\u9a13\u306e\u3042\u308b<strong>\u30ad\u30e3\u30ea\u30a2\u30a2\u30c9\u30d0\u30a4\u30b6\u30fc\u304b\u3089<\/strong>\u652f\u63f4\u304c\u53d7\u3051\u3089\u308c\u307e\u3059\u3002<\/p>\n\n<p class=\"u-mb-ctrl u-mb-10\">\u3053\u308c\u307e\u3067<strong><span class=\"swl-marker mark_yellow\">4\u4e075,000\u540d\u4ee5\u4e0a<\/span><\/strong><span class=\"swl-marker mark_yellow\">\u306e<\/span>\u53d7\u8b1b\u751f\u3092\u6307\u5c0e\u3057<strong><span class=\"swl-marker mark_yellow\">\u300c\u8ee2\u8077\u6210\u529f\u738799%<\/span><\/strong>\u300d\u306e\u5b9f\u7e3e\u3092\u8a87\u308b\u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u306a\u3089\u3001\u672a\u7d4c\u9a13\u304b\u3089\u3067\u3082\u632b\u6298\u306a\u304fIT\u30a8\u30f3\u30b8\u30cb\u30a2\u3078\u306e\u8ee2\u8077\u304c\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3088\u3002<\/p>\n\n<p class=\"has-text-align-center u-mb-ctrl u-mb-0\">\uff3c \u7d66\u4ed8\u91d1\u3067\u53d7\u8b1b\u6599\u304c\u6700\u592780%OFF \uff0f<a href=\"https:\/\/lp.sejuku.net\/lp1_blog_02?cid=pro_howto_normal_pr_Normal_sbid-3286\"><\/a><\/p>\n\n<div class=\"swell-block-button is-style-btn_shiny\" data-id=\"acf7afed\"><a href=\"https:\/\/lp.sejuku.net\/lp1_blog_02\/?cid=lp_text_cta\" class=\"swell-block-button__link\"><span>\u516c\u5f0f\u30b5\u30a4\u30c8\u3067\u8a73\u7d30\u3092\u898b\u308b<\/span><\/a><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Java\u306eString\u30af\u30e9\u30b9\u3068\u306f<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">String\u30af\u30e9\u30b9<\/h3>\n\n\n\n<p>String\u3068\u306f\u3001\u6587\u5b57\u5217\u3092\u6271\u3046\u305f\u3081\u306e\u30af\u30e9\u30b9\u3067\u3059\u3002\u5185\u90e8\u306b\u6587\u5b57\u5217\u3092\u4fdd\u6301\u3057\u3001\u305d\u308c\u3092\u64cd\u4f5c\u3059\u308b\u305f\u3081\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u30c7\u30fc\u30bf\u3092\u4fdd\u6301\u3057\u3066\u3044\u308b\u3060\u3051\u306e\u57fa\u672c\u30c7\u30fc\u30bf\u578b(boolean,byte,char,short,int,long,float,double)\u3068\u306f\u9055\u3046\u3053\u3068\u306b\u6c17\u3092\u3064\u3051\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<p><b>\u300cjava.lang\u300d\u30d1\u30c3\u30b1\u30fc\u30b8<\/b>\u306e\u4e2d\u306b\u3042\u308b\u305f\u3081\u3001import\u3059\u308b\u3053\u3068\u306a\u304f\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u521d\u671f\u5316\u3068\u4ee3\u5165<\/h3>\n\n\n\n<p>\u6587\u5b57\u5217\u3092\u6271\u3046\u305f\u3081\u306b\u306f\u5909\u6570\u3092\u7528\u610f(\u5b9a\u7fa9)\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u66f8\u304d\u65b9\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">String str;\n<\/pre>\n\n\n\n<p>\u3053\u308c\u3067\u6587\u5b57\u5217\u3092\u5165\u308c\u308b\u3053\u3068\u306e\u51fa\u6765\u308b\u5909\u6570\u300cstr\u300d\u3092\u7528\u610f\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002\u6b21\u306b\u7528\u610f\u3059\u308b\u306e\u3068\u540c\u6642\u306b\u521d\u671f\u5316\u3092\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">String str = \"\";\n<\/pre>\n\n\n\n<p>\u6587\u5b57\u5217\u3092\u5165\u308c\u308b\u3053\u3068\u306e\u51fa\u6765\u308b\u5909\u6570\u300cstr\u300d\u3092\u7528\u610f\u3057\u521d\u671f\u5024\u3068\u3057\u3066\u7a7a\u6587\u5b57(\u4f55\u3082\u306a\u3044\u6587\u5b57\u5217)\u3092\u4ee3\u5165\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u90e8\u5206\u306f\u4efb\u610f\u306e\u6587\u5b57\u5217\u3092\u5165\u308c\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u300choge\u300d\u3068\u3044\u3046\u6587\u5b57\u5217\u3092\u5165\u308c\u308b\u306b\u306f\u6b21\u306e\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">String str = \"hoge\";\n<\/pre>\n\n\n\n<p>\u3053\u308c\u3067\u5909\u6570str\u306b\u306f\u300choge\u300d\u3068\u3044\u3046\u6587\u5b57\u5217\u304c\u5165\u308a\u307e\u3057\u305f\u3002\u3055\u304d\u307b\u3069\u3001String\u306f\u30af\u30e9\u30b9\u3067\u3042\u308b\u3053\u3068\u3092\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002\u30af\u30e9\u30b9\u304b\u3089\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u308b\u6642\u306f\u3001\u901a\u5e38<b>new\u6f14\u7b97\u5b50<\/b>\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3057\u304b\u3057\u3001String\u306fnew\u6f14\u7b97\u5b50\u3092\u4f7f\u308f\u305a\u6587\u5b57\u5217\u3092\u4ee3\u5165\u3057\u3066\u3044\u308b\u3060\u3051\u3067\u3059\u3002\u5b9f\u306f\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u306f&#8221;&#8221;\uff08\u30c0\u30d6\u30eb\u30af\u30a9\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\uff09\u3067\u56f2\u308f\u308c\u305f\u6587\u5b57\u5217\u3092\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u3057\u3066\u51e6\u7406\u3057\u3066\u304a\u308a\u3001\u300cString str = &#8220;hoge&#8221;;\u300d\u3068\u66f8\u304f\u3060\u3051\u3067\u3001\u30e1\u30e2\u30ea\u4e0a\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u4f5c\u3089\u308c\u3066\u3044\u308b\u306e\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u3001<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">String str = new String(\"hoge\");\n<\/pre>\n\n\n\n<p>\u306e\u3088\u3046\u306b\u3001new\u6f14\u7b97\u5b50\u3092\u4f7f\u3046\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">length\u3067\u6587\u5b57\u5217\u306e\u9577\u3055\u3092\u53d6\u5f97\u3059\u308b<\/h3>\n\n\n\n<p>\u6587\u5b57\u5217\u306e\u9577\u3055\u3092\u53d6\u5f97\u3059\u308b\u306b\u306f\u3001length\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3044\u307e\u3059\u3002length\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u66f8\u304d\u65b9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">String\u578b\u5909\u6570.length()\n<\/pre>\n\n\n\n<p>length\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u6b21\u306e\u8a18\u4e8b\u3092\u53c2\u8003\u306b\u3057\u3066\u4e0b\u3055\u3044\u3002<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/19392\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/03\/java_length-150x85.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Java\u5165\u9580\u3011String.length\u3067\u6587\u5b57\u5217\u306e\u9577\u3055\u3092\u78ba\u8a8d\u3059\u308b\u65b9\u6cd5<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<h3 class=\"wp-block-heading\">\u6587\u5b57\u5217\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u8abf\u3079\u308b<\/h3>\n\n\n\n<p>\u6587\u5b57\u5217\u306e\u6bd4\u8f03\u306b\u3064\u3044\u3066\u3001\u6570\u5024\u306e\u6bd4\u8f03\u306f\u300c==\u300d\u3067\u53ef\u80fd\u3067\u3059\u304c\u3001\u6587\u5b57\u5217\u306f\u300c==\u300d\u3067\u6bd4\u8f03\u3059\u308b\u3079\u304d\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u6587\u5b57\u5217\u306e\u6bd4\u8f03\u306b\u306fequals\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002equals\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u66f8\u304d\u65b9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">String\u578b\u5909\u65701.equals(String\u578b\u5909\u65702)\n<\/pre>\n\n\n\n<p>equals\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u7406\u7531\u306b\u3064\u3044\u3066\u306f\u6b21\u306e\u8a18\u4e8b\u306b\u307e\u3068\u3081\u3066\u3042\u308a\u307e\u3059\u306e\u3067\u3001\u4e00\u8aad\u306e\u4fa1\u5024\u30a2\u30ea\u3067\u3059\uff01<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/14621\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/12\/image8-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Java\u5165\u9580\u3011\u6587\u5b57\u5217(String)\u3092\u6bd4\u8f03\u3059\u308b\u65b9\u6cd5(\u300c==\u300d\u3068\u300cequals\u300d)<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2025\u5e7412\u670829\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<h2 class=\"wp-block-heading\">String\u30af\u30e9\u30b9\u3067\u3088\u304f\u4f7f\u30467\u3064\u306e\u64cd\u4f5c<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u6587\u5b57\u5217\u304c\u7a7a\u6587\u5b57(&#8220;&#8221;)\u304bnull\u304b\u3092\u8abf\u3079\u308b<\/h3>\n\n\n\n<p>\u3053\u3053\u3067\u306f\u6587\u5b57\u5217\u304c\u4f55\u3082\u5165\u3063\u3066\u3044\u306a\u3044\u72b6\u614b\u304b\u3001null\u304b\u3069\u3046\u304b\u306e\u5224\u5b9a\u3092\u884c\u3044\u305f\u3044\u5834\u5408\u306b\u3001\u3069\u3046\u3059\u308c\u3070\u3088\u3044\u304b\u3092\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">isEmpty\u3067\u6587\u5b57\u5217\u304c\u7a7a\u304b\u8abf\u3079\u308b<\/h4>\n\n\n\n<p>\u307e\u305a\u3001\u7a7a\u304b\u3069\u3046\u304b\u3092\u77e5\u308a\u305f\u3044\u5834\u5408\u306fisEmpty\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3053\u3068\u3067\u5b9f\u73fe\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002isEmpty\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u66f8\u304d\u65b9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">String\u578b\u5909\u6570.isEmpty()\n<\/pre>\n\n\n\n<p>\u305f\u3060\u3001\u3053\u306eisEmpty\u306b\u306f\u5c11\u3057\u554f\u984c\u304c\u3042\u308a\u3001\u305d\u306e\u554f\u984c\u70b9\u3068\u89e3\u6c7a\u7b56\u306b\u3064\u3044\u3066\u6b21\u306e\u8a18\u4e8b\u3067\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/19611\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/03\/java_stringisempty-150x85.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">Java\u306eString.isEmpty\u30fbStringUtils.isEmpty\u306e\u4f7f\u3044\u65b9\u3084\u9055\u3044\u3068\u306f<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<h4 class=\"wp-block-heading\">\u6587\u5b57\u5217\u304cnull\u304b\u3069\u3046\u304b\u8abf\u3079\u308b<\/h4>\n\n\n\n<p>\u6b21\u306b\u6587\u5b57\u5217\u304cnull\u304b\u3069\u3046\u304b\u77e5\u308a\u305f\u3044\u5834\u5408\u3067\u3059\u304c\u300c==\u300d\u6f14\u7b97\u5b50\u3092\u4f7f\u3044\u307e\u3059\u3002\u5148\u7a0b\u306e\u89e3\u8aac\u3067\u6587\u5b57\u5217\u306e\u6bd4\u8f03\u306b\u306f\u300c==\u300d\u3092\u7528\u3044\u308b\u3079\u304d\u3067\u306a\u3044\u3068\u66f8\u304d\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u3057\u304b\u3057\u3001null\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u305f\u3081\u306b\u306f\u3053\u306e\u6bd4\u8f03\u6f14\u7b97\u5b50\u3092\u7528\u3044\u307e\u3059\u3002\u300c==\u300d\u6f14\u7b97\u5b50\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u66f8\u304d\u65b9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">if(String\u578b\u5909\u6570 != null) {\n    \u51e6\u7406\n}\n<\/pre>\n\n\n\n<p>\u304f\u308f\u3057\u3044\u4f7f\u3044\u65b9\u3068\u4f7f\u7528\u4f8b\u306b\u3064\u3044\u3066\u6b21\u306e\u8a18\u4e8b\u3067\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/19604\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/03\/java-string-null-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Java\u5165\u9580\u3011String\u578b\u306enull\u3092\u30c1\u30a7\u30c3\u30af\u3092\u3059\u308b\u65b9\u6cd5<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<p>\u307e\u305f\u3001Java8\u3088\u308aOptional\u3068\u3044\u3046\u6a5f\u80fd\u304c\u8ffd\u52a0\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u6a5f\u80fd\u3092\u4f7f\u3046\u3068\u3001null\u30c1\u30a7\u30c3\u30af\u3092\u3053\u308c\u307e\u3067\u3088\u308a\u7c21\u6f54\u306b\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002Optional\u306b\u3064\u3044\u3066\u306e\u8a73\u3057\u3044\u89e3\u8aac\u306f\u3001\u3053\u3061\u3089\u3092\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u306d\u3002<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/12614\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/11\/image6-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">Java8\u306e\u65b0\u6a5f\u80fd\u3092\u5fb9\u5e95\u89e3\u8aac\uff01(\u30e9\u30e0\u30c0\u5f0f\u3001Stream\u306a\u3069)<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<h3 class=\"wp-block-heading\">\u6587\u5b57\u5217\u306e\u5206\u5272\u30fb\u9023\u7d50\u30fb\u5207\u308a\u51fa\u3057\u30fb\u7a7a\u767d\u524a\u9664<\/h3>\n\n\n\n<p>\u3053\u3053\u3067\u306f\u6587\u5b57\u5217\u306e\u4e00\u90e8\u3092\u52a0\u5de5\u3057\u305f\u308a\u3001\u6587\u5b57\u5217\u540c\u58eb\u3092\u9023\u7d50\u3057\u305f\u308a\u3001\u3068\u3044\u3063\u305f\u6587\u5b57\u5217\u3092\u300c\u64cd\u4f5c\u300d\u3059\u308b\u305f\u3081\u306e\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">split\u3067\u5206\u5272<\/h4>\n\n\n\n<p>\u6587\u5b57\u5217\u306e\u4e2d\u306b\u3042\u308b\u7279\u5b9a\u306e\u6587\u5b57\u5217\u3067\u5206\u5272\u3057\u3001\u30c7\u30fc\u30bf\u3092\u914d\u5217\u3067\u53d7\u3051\u53d6\u308a\u305f\u3044\u5834\u5408\u306fsplit\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3044\u307e\u3059\u3002split\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u66f8\u304d\u65b9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">String\u578b\u5909\u6570.split(\"\u533a\u5207\u308a\u6587\u5b57\")\n<\/pre>\n\n\n\n<p>split\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9\u3068\u4f7f\u7528\u4f8b\u304c\u6b21\u306e\u8a18\u4e8b\u3067\u89e3\u8aac\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001\u305c\u3072\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/14487\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/01\/split-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Java\u5165\u9580\u3011\u6587\u5b57\u5217\u3092\u5206\u5272\u3059\u308bsplit\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9(List\u5316\u3082\u89e3\u8aac)<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<h4 class=\"wp-block-heading\">concat\u3001join\u3067\u9023\u7d50<\/h4>\n\n\n\n<p>\u4eca\u5ea6\u306f\u6587\u5b57\u5217\u3092\u9023\u7d50\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u307f\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u6587\u5b57\u5217\u3092\u9023\u7d50\u3059\u308b\u65b9\u6cd5\u306f\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\u3002\u307e\u305a\u306f\u5b9a\u756a\u7684\u306a\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>concat\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3048\u3070\u7c21\u5358\u306b\u6587\u5b57\u5217\u306e\u9023\u7d50\u3092\u884c\u3046\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002concat\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u66f8\u304d\u65b9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">String\u578b\u5909\u6570.concat(String str)\n<\/pre>\n\n\n\n<p>\u305d\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u305f\u8a18\u4e8b\u304c\u6b21\u306e\u8a18\u4e8b\u3067\u3059\u3002\u3055\u3089\u306b\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001StringBuilder\u30af\u30e9\u30b9\u306eappend\u30e1\u30bd\u30c3\u30c9\u3092\u7528\u3044\u305f\u5834\u5408\u3068\u3001\u3069\u3061\u3089\u306e\u51e6\u7406\u901f\u5ea6\u304c\u65e9\u3044\u306e\u304b\u3092\u8a08\u6e2c\u3057\u305f\u30c7\u30fc\u30bf\u3082\u8a18\u8f09\u3057\u3066\u3044\u307e\u3059\u3002\u51e6\u7406\u901f\u5ea6\u304c\u6c17\u306b\u306a\u308b\u65b9\u306f\u305c\u3072\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/19552\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/03\/java_string_concat-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Java\u5165\u9580\u3011String\u306e\u7d50\u5408\u65b9\u6cd5(concat)<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<p>\u6b21\u306bJava8\u304b\u3089\u8ffd\u52a0\u3055\u308c\u305fStreamAPI\u306ejoin\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u65b9\u6cd5\u3067\u3059\u3002join\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u66f8\u304d\u65b9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">String.join(\"\u533a\u5207\u308a\u6587\u5b57\", String\u578b\u5909\u65701, String\u578b\u5909\u65702, \u30fb\u30fb\u30fb)\n<\/pre>\n\n\n\n<p>Java\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u7d4c\u9a13\u8005\u306e\u65b9\u3067\u3082\u307e\u3060\u99b4\u67d3\u307f\u304c\u7121\u3044\u65b9\u3082\u3044\u3089\u3063\u3057\u3083\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u662f\u975e\u6b21\u306e\u8a18\u4e8b\u3092\u8aad\u3093\u3067\u4f7f\u3044\u65b9\u3092\u5b66\u3093\u3067\u304a\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/19307\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/03\/java_join-150x85.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Java String\u3011join\u30e1\u30bd\u30c3\u30c9\u3067\u6587\u5b57\u5217\u3092\u9023\u7d50\u3059\u308b\u65b9\u6cd5\u307e\u3068\u3081<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<h4 class=\"wp-block-heading\">substring\u3067\u7bc4\u56f2\u3092\u5207\u308a\u51fa\u3059<\/h4>\n\n\n\n<p>\u6587\u5b57\u5217\u306e\u4e00\u90e8\u3060\u3051\u3092\u5207\u308a\u51fa\u3057\u305f\u3044\u6642\u306b\u306f\u3001substring\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3053\u3068\u3067\u305d\u306e\u7d50\u679c\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002substring\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u66f8\u304d\u65b9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">String.substring(int beginIndex, int endIndex)\n<\/pre>\n\n\n\n<p>\u3053\u306esubstring\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u305f\u3082\u306e\u304c\u6b21\u306e\u8a18\u4e8b\u3067\u3059\u3002\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u304b\u3089\u5c11\u3057\u5fdc\u7528\u7684\u306a\u4f7f\u3044\u65b9\u307e\u3067\u89e3\u8aac\u3057\u3066\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/14503\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/09\/java-substring-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Java\u5165\u9580\u3011substring\u3067\u6587\u5b57\u5217\u3092\u5207\u308a\u51fa\u3057\u62bd\u51fa\u3059\u308b\u65b9\u6cd5<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<h4 class=\"wp-block-heading\">trim\u3067\u7a7a\u767d\u3092\u524a\u9664<\/h4>\n\n\n\n<p>\u6587\u5b57\u30c7\u30fc\u30bf\u3092\u5916\u90e8\u304b\u3089\u8aad\u307f\u8fbc\u3093\u3067\u6271\u3046\u969b\u306b\u6587\u5b57\u5217\u4e2d\u306b\u4f59\u5206\u306a\u7a7a\u767d\u304c\u6df7\u3056\u3063\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u6587\u5b57\u5217\u4e2d\u306e\u4f59\u767d(\u534a\u89d2\u30b9\u30da\u30fc\u30b9)\u3092\u524a\u9664\u3059\u308b\u306b\u306ftrim\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3044\u307e\u3059\u3002trim\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u66f8\u304d\u65b9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">String\u578b\u5909\u6570.trim()\n<\/pre>\n\n\n\n<p>trim\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u6b21\u306e\u8a18\u4e8b\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002trim\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9\u3084\u7279\u6b8a\u306a\u6587\u5b57\u306b\u3064\u3044\u3066\u524a\u9664\u3059\u308b\u3088\u3046\u306a\u5fdc\u7528\u7684\u306a\u89e3\u8aac\u3082\u66f8\u304b\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/19413\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/09\/java-trim1-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Java\u5165\u9580\u3011String\u578b\u306e\u6587\u5b57\u5217\u304b\u3089trim\u3067\u7a7a\u767d\u30b9\u30da\u30fc\u30b9\u3092\u524a\u9664<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<h3 class=\"wp-block-heading\">\u6587\u5b57\u5217\u306e\u691c\u7d22<\/h3>\n\n\n\n<p>\u3053\u3053\u3067\u306f\u6587\u5b57\u5217\u306e\u4e2d\u306b\u7279\u5b9a\u306e\u5024\u304c\u542b\u307e\u308c\u308b\u304b\u3069\u3046\u304b\u3001\u3064\u307e\u308a\u6587\u5b57\u5217\u306e\u691c\u7d22\u3092\u884c\u3046\u305f\u3081\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\uff01<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">contains\u3067\u6709\u7121\u306e\u78ba\u8a8d<\/h4>\n\n\n\n<p>contains\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6307\u5b9a\u306e\u6587\u5b57\u5217\u304c\u5b58\u5728\u3057\u3066\u3044\u308b\u304b\u3044\u306a\u3044\u304b\u3067\u300ctrue \/ false\u300d\u3067\u7d50\u679c\u3092\u8fd4\u3057\u307e\u3059\u3002contains\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u66f8\u304d\u65b9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">String\u578b\u5909\u6570.contains(\"\u6307\u5b9a\u6587\u5b57\u5217\")\n<\/pre>\n\n\n\n<p>\u304f\u308f\u3057\u304f\u306f\u6b21\u306e\u8a18\u4e8b\u3067\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/19257\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/08\/\u3010\u901f\u7fd2Java\u3011String\u306econtains\u3067\u6587\u5b57\u5217\u3092\u542b\u3080\u304b\u77e5\u308b\u65b9\u6cd5-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010\u901f\u7fd2Java\u3011String\u306econtains\u3067\u6587\u5b57\u5217\u3092\u542b\u3080\u304b\u77e5\u308b\u65b9\u6cd5<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<h4 class=\"wp-block-heading\">indexOf\u3067\u4f4d\u7f6e\u306e\u691c\u7d22<\/h4>\n\n\n\n<p>\u6b21\u306b\u540c\u3058\u691c\u7d22\u3067\u3059\u304c\u3001\u623b\u308a\u5024\u304c\u9055\u3046indexOf\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u7d39\u4ecb\u3057\u307e\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u7279\u5b9a\u306e\u5024\u3092\u898b\u3064\u3051\u305f\u5834\u5408\u306b\u3001\u3069\u306e\u4f4d\u7f6e\u3067\u898b\u3064\u304b\u3063\u305f\u304b\u3092\u8fd4\u3057\u3066\u304f\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u306b\u306a\u308a\u307e\u3059\u3002indexOf\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u66f8\u304d\u65b9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">String\u578b\u5909\u6570.indexOf(\"\u6307\u5b9a\u6587\u5b57\u5217\")\n<\/pre>\n\n\n\n<p>\u8a73\u3057\u304f\u306f\u6b21\u306e\u8a18\u4e8b\u3067\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u662f\u975e\u3054\u89a7\u304f\u3060\u3055\u3044\uff01<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/20001\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/03\/blog_thumb2-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u30103\u5206Java\u5165\u9580\u3011String\u3067\u6587\u5b57\u5217\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u77e5\u308b\u65b9\u6cd5(indexOf)<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<h4 class=\"wp-block-heading\">startsWith\u3001endsWith\u3067\u59cb\u307e\u308a\u3068\u7d42\u308f\u308a\u3092\u691c\u7d22<\/h4>\n\n\n\n<p>\u6587\u5b57\u5217\u306e\u524d\u65b9\u4e00\u81f4(\u63a5\u982d\u8f9e)\u3084\u3001\u5f8c\u65b9\u4e00\u81f4(\u63a5\u5c3e\u8f9e)\u306e\u78ba\u8a8d\u3092\u3059\u308b\u306b\u306f\u3001startsWith\u30e1\u30bd\u30c3\u30c9\u3001endsWith\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3044\u307e\u3059\u3002startsWith\u30e1\u30bd\u30c3\u30c9\u3001endsWith\u30e1\u30bd\u30c3\u30c9\u306f\u6b21\u306e\u3088\u3046\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u66f8\u304d\u65b9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">String\u578b\u5909\u6570.startsWith(\"\u6307\u5b9a\u6587\u5b57\u5217\")\nString\u578b\u5909\u6570.endsWith(\"\u6307\u5b9a\u6587\u5b57\u5217\")<\/pre>\n\n\n\n<p>\u8a73\u3057\u304f\u306f\u6b21\u306e\u8a18\u4e8b\u3067\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u662f\u975e\u3054\u89a7\u304f\u3060\u3055\u3044\uff01<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/50845\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/image-12-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Java\u5165\u9580\u3011startsWith\u3001endsWith\u3067\u6587\u5b57\u5217\u306e\u59cb\u307e\u308a\u3068\u7d42\u308f\u308a\u3092\u5224\u5b9a<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<h3 class=\"wp-block-heading\">\u6587\u5b57\u5217\u306e\u6574\u5f62<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">format\u3067\u66f8\u5f0f\u4ed8\u304d\u6587\u5b57\u5217\u3092\u51fa\u529b<\/h4>\n\n\n\n<p>\u6587\u5b57\u5217\u3092\u6271\u3063\u3066\u3044\u304f\u4e0a\u3067\u3001\u30ab\u30f3\u30de\u533a\u5207\u308a\u306e\u6570\u5024\u3084\u5148\u982d\u304b\u30890\u3067\u57cb\u3081\u305f\u6570\u5024\u306e\u3088\u3046\u306b\u300c\u66f8\u5f0f\u4ed8\u304d\u6587\u5b57\u5217\u300d\u3068\u3044\u3063\u305f\u3082\u306e\u3092\u6271\u3046\u6a5f\u4f1a\u304c\u51fa\u3066\u304f\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u300c\u66f8\u5f0f\u4ed8\u304d\u6587\u5b57\u5217\u300d\u3092\u51fa\u529b\u3059\u308b\u306b\u306fformat\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002format\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u66f8\u304d\u65b9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">String.format(\"\u66f8\u5f0f\" , \u5024)\n<\/pre>\n\n\n\n<p>\u300c\u66f8\u5f0f\u4ed8\u304d\u6587\u5b57\u5217\u300d\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u305f\u8a18\u4e8b\u304c\u6b21\u306e\u8a18\u4e8b\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306fformat\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9\u3068\u66f8\u5f0f\u4ed8\u304d\u6587\u5b57\u5217\u306b\u3064\u3044\u3066\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/14466\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/01\/java_string_format_new-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u30105\u5206\u3067\u7406\u89e3\u3011Java\u306eString.format\u306e\u4f7f\u3044\u65b9\u307e\u3068\u3081<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<h4 class=\"wp-block-heading\">toUpperCase\u3001toLowerCase\u3067\u5927\u6587\u5b57\u3068\u5c0f\u6587\u5b57\u3092\u5909\u63db\u3059\u308b<\/h4>\n\n\n\n<p>\u6587\u5b57\u5217\u306e\u5927\u6587\u5b57\u3068\u5c0f\u6587\u5b57\u3092\u5909\u63db\u3059\u308b\u305f\u3081\u306etoUpperCase\u30e1\u30bd\u30c3\u30c9\u3068toLowerCase\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u3001\u6307\u5b9a\u3057\u305f\u6587\u5b57\u5217\u306e\u3059\u3079\u3066\u3092\u5927\u6587\u5b57\u306b\u3057\u305f\u308a\u3001\u5c0f\u6587\u5b57\u306b\u3057\u305f\u308a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u66f8\u304d\u65b9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">String\u578b\u5909\u6570.toUpperCase()\nString\u578b\u5909\u6570.toLowerCase()<\/pre>\n\n\n\n<p>\u8a73\u3057\u304f\u306f\u6b21\u306e\u8a18\u4e8b\u3067\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u662f\u975e\u3054\u89a7\u304f\u3060\u3055\u3044\uff01<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/50886\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/image-3-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Java\u5165\u9580\u3011toUpperCase\u3001toLowerCase\u3067\u5927\u6587\u5b57\u3068\u5c0f\u6587\u5b57\u3092\u5909\u63db\u3059\u308b<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<h3 class=\"wp-block-heading\">\u6587\u5b57\u30b3\u30fc\u30c9\u3068\u30d0\u30a4\u30c8\u914d\u5217<\/h3>\n\n\n\n<p>\u3053\u3053\u3067\u306f\u6587\u5b57\u5217\u3092\u64cd\u4f5c\u3059\u308b\u4e0a\u3067\u7d76\u5bfe\u306b\u6b20\u304b\u3059\u3053\u3068\u306e\u3067\u304d\u306a\u3044\u6587\u5b57\u30b3\u30fc\u30c9\u3068\u30d0\u30a4\u30c8\u306e\u304a\u8a71\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u6587\u5b57\u30b3\u30fc\u30c9\u306e\u5909\u63db\u3068\u5224\u5b9a<\/h4>\n\n\n\n<p>\u307e\u305a\u6587\u5b57\u30b3\u30fc\u30c9\u3068\u306f\u4f55\u304b\u304b\u3089\u3001\u6587\u5b57\u30af\u30e9\u30b9\u3068\u306e\u95a2\u4fc2\u6027\u306b\u3064\u3044\u3066\u6b21\u306e\u8a18\u4e8b\u3067\u4e01\u5be7\u306b\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002\u6587\u5b57\u30b3\u30fc\u30c9\u3068\u306f\u3069\u3093\u306a\u3082\u306e\u304b\u5168\u304f\u308f\u304b\u3089\u306a\u3044\u65b9\u3084\u3001\u4f55\u3068\u306a\u304f\u3057\u304b\u77e5\u3089\u306a\u3044\u65b9\u306f\u4e00\u5ea6\u307f\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/19673\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/03\/java_thumb-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Java\u5165\u9580\u3011\u6587\u5b57\u30b3\u30fc\u30c9\u306e\u78ba\u8a8d\u30fb\u5909\u63db\u30fb\u6307\u5b9a\u3059\u308b\u65b9\u6cd5\u3092\u89e3\u8aac\uff01<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<h4 class=\"wp-block-heading\">getBytes\u3067\u30d0\u30a4\u30c8\u914d\u5217\u306b\u5909\u63db<\/h4>\n\n\n\n<p>\u6b21\u306bgetBytes\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002\u6587\u5b57\u5217\u306f\u4e00\u8a00\u3067\u8868\u73fe\u3059\u308c\u3070\u300c\u30d0\u30a4\u30c8\u300d\u3068\u3044\u3046\u5358\u4f4d\u306e\u30c7\u30fc\u30bf\u306e\u584a\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u6587\u5b57\u5217\u3092\u30d0\u30a4\u30c8\u30c7\u30fc\u30bf\u3068\u3057\u3066\u6271\u3044\u305f\u3044\u3068\u304d\u306b\u306f\u3001\u3053\u306egetBytes\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u30d0\u30a4\u30c8\u30c7\u30fc\u30bf\u306b\u5909\u63db\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002getBytes\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u66f8\u304d\u65b9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">String\u578b\u5909\u6570.getBytes()\n<\/pre>\n\n\n\n<p>\u3069\u3053\u3067\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u5fc5\u8981\u6027\u304c\u3042\u308b\u306e\u304b\u306a\u3069\u3092\u3001\u6b21\u306e\u8a18\u4e8b\u3067\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u306e\u3067\u305c\u3072\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/19650\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/03\/java_getbytes-150x85.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">Java\u306egetBytes\uff5c\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3084Sting\u3068byte\u914d\u5217\u306e\u76f8\u4e92\u5909\u63db<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<h3 class=\"wp-block-heading\">\u6b63\u898f\u8868\u73fe\u3067\u30de\u30c3\u30c1\u30f3\u30b0\u3001\u7f6e\u63db<\/h3>\n\n\n\n<p>\u3053\u3053\u304b\u3089\u306f\u3001\u3088\u308a\u5fdc\u7528\u7684\u306a\u4f7f\u3044\u65b9\u3092\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002\u307e\u305a\u306f\u300c\u6b63\u898f\u8868\u73fe\u300d\u306b\u3064\u3044\u3066\u3067\u3059\u3002\u6b63\u898f\u8868\u73fe\u306f\u7279\u5b9a\u306e\u6761\u4ef6\u306b\u5408\u81f4\u3059\u308b\u6587\u5b57\u5217\u30d1\u30bf\u30fc\u30f3\u306e\u3053\u3068\u3067\u3059\u3002\u6b63\u898f\u8868\u73fe\u306b\u5408\u81f4\u3057\u305f\u6587\u5b57\u5217\u3092\u62bd\u51fa\u3057\u3001\u305d\u306e\u5408\u81f4\u3057\u305f\u6587\u5b57\u5217\u306b\u5bfe\u3057\u3066\u4f55\u3089\u304b\u306e\u64cd\u4f5c\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">matches\u3067\u30d1\u30bf\u30fc\u30f3\u306e\u30de\u30c3\u30c1\u30f3\u30b0<\/h4>\n\n\n\n<p>\u307e\u305a\u306f\u6761\u4ef6\u306e\u4e00\u81f4\u306b\u3064\u3044\u3066\u77e5\u308b\u305f\u3081\u306bmatches\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u5b66\u3073\u307e\u3057\u3087\u3046\u3002matches\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u66f8\u304d\u65b9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">String\u578b\u5909\u6570.matches(\"\u6b63\u898f\u8868\u73fe\u306e\u30d1\u30bf\u30fc\u30f3\")\n<\/pre>\n\n\n\n<p>\u6b21\u306e\u8a18\u4e8b\u3067\u4e01\u5be7\u306b\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u306e\u3067\u305c\u3072\u3054\u89a7\u304f\u3060\u3055\u3044\uff01<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/19341\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/03\/java_mojiretu-150x85.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">Java\u3067\u6587\u5b57\u5217\u3092\u691c\u7d22\u3059\u308b\u65b9\u6cd5\uff08matches\u30fbindexOf\u30fbequals\u306a\u3069\uff09<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<h4 class=\"wp-block-heading\">\u6b63\u898f\u8868\u73fe\u306e\u66f8\u304d\u65b9\u306e\u30b5\u30f3\u30d7\u30eb\u30d1\u30bf\u30fc\u30f3\u307e\u3068\u3081<\/h4>\n\n\n\n<p>\u6b63\u898f\u8868\u73fe\u306f\u6c7a\u3081\u3089\u308c\u305f\u30d1\u30bf\u30fc\u30f3\u306b\u6cbf\u3063\u305f\u66f8\u304d\u65b9\u3092\u3057\u307e\u3059\u304c\u3001\u305d\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u81ea\u5206\u3067\u8003\u3048\u308b\u306e\u306f\u521d\u5fc3\u8005\u306b\u306f\u96e3\u3057\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u6b21\u306e\u8a18\u4e8b\u3067\u306f\u3001\u3088\u304f\u4f7f\u3046\u6b63\u898f\u8868\u73fe\u306e\u66f8\u304d\u65b9\u306e\u30b5\u30f3\u30d7\u30eb\u4e00\u89a7\u3082\u3042\u308b\u306e\u3067\u305c\u3072\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/13215\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2016\/12\/image-4-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Java\u3067\u6b63\u898f\u8868\u73fe\u3011\u6587\u5b57\u5217\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u30d1\u30bf\u30fc\u30f3\u306e\u66f8\u304d\u65b9\u3068\u30b5\u30f3\u30d7\u30eb<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<h4 class=\"wp-block-heading\">replace\u3068replaceAll\u3067\u7f6e\u63db<\/h4>\n\n\n\n<p>\u6b21\u306b\u6587\u5b57\u5217\u306e\u7f6e\u63db\u306b\u3064\u3044\u3066\u89e3\u8aac\u3092\u3057\u307e\u3059\u3002\u300c\u7f6e\u63db\u300d\u3068\u306f\u5b57\u306e\u3054\u3068\u304f\u6587\u5b57\u5217\u3092\u7f6e\u304d\u63db\u3048\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u7f6e\u63db\u3059\u308b\u305f\u3081\u306e\u30e1\u30bd\u30c3\u30c9\u306b\u306freplace\u30e1\u30bd\u30c3\u30c9\u3084\u3044\u304f\u3064\u304b\u7a2e\u985e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>replace\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u66f8\u304d\u65b9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">String\u578b\u5909\u6570.replace(\u7f6e\u63db\u3055\u308c\u308b\u6587\u5b57\u5217, \u7f6e\u63db\u6587\u5b57\u5217)\n<\/pre>\n\n\n\n<p>\u6b21\u306e\u8a18\u4e8b\u3067\u306freplace\u30e1\u30bd\u30c3\u30c9\u3084\u3044\u304f\u3064\u304b\u306e\u7a2e\u985e\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/14494\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/01\/image-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Java\u5165\u9580\u3011\u6587\u5b57\u5217\u3092\u7f6e\u63db\u3059\u308b(replace\/replaceAll\/replaceFirst)<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<p>\u3055\u3089\u306b\u6b21\u306e\u8a18\u4e8b\u3067\u306f\u3001replaceAll\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3092\u3057\u3066\u3044\u307e\u3059\u3002replaceAll\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u66f8\u304d\u65b9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">String\u578b\u5909\u6570.replaceAll(\"\u6b63\u898f\u8868\u73fe\u306e\u30d1\u30bf\u30fc\u30f3\", \u7f6e\u63db\u6587\u5b57\u5217)\n<\/pre>\n\n\n\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u901f\u5ea6\u9762\u7b49\u306e\u30c7\u30fc\u30bf\u3082\u307e\u3068\u3081\u3066\u3042\u308a\u307e\u3059\u306e\u3067\u3001\u4eca\u5f8c\u4f7f\u3063\u3066\u3044\u304f\u4e0a\u3067\u53c2\u8003\u306b\u306a\u308b\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/19689\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/03\/java_string_replaceall-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Java\u5165\u9580\u3011String\u306e\u4e00\u62ec\u7f6e\u63db(replaceAll)<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<h3 class=\"wp-block-heading\">String\u578b\u3068\u4ed6\u306e\u578b\u3068\u306e\u578b\u5909\u63db<\/h3>\n\n\n\n<p>\u3053\u3053\u3067\u306f\u6587\u5b57\u5217\u3092\u5225\u306e\u578b\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u3092\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">int\u578b\u3001double\u578b\u3068\u306e\u578b\u5909\u63db<\/h4>\n\n\n\n<p>\u307e\u305a\u308f\u304b\u308a\u3084\u3059\u3044\u4f8b\u3068\u3057\u3066\u3001\u3088\u304f\u3042\u308b\u300c\u6587\u5b57\u5217\u300d\u21d4\u300c\u6570\u5024\u300d\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u3092\u6b21\u306e\u8a18\u4e8b\u3067\u7d39\u4ecb\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u5909\u63db\u306b\u5931\u6557\u3057\u305f\u969b\u306b\u3064\u3044\u3066\u3082\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u30a8\u30e9\u30fc\u306b\u3064\u3044\u3066\u6c17\u306b\u306a\u308b\u65b9\u3082\u305c\u3072\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/14531\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/01\/java_stringint-150x85.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Java\u3011String\u578b\u3092int\u578b\u306b\u5909\u63db\u3059\u308b<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/19526\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/03\/java1-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u521d\u5fc3\u8005\u5fc5\u898b\uff01Java\u306eString\u3001int\u3068double\u306e\u578b\u5909\u63db\u306e\u65b9\u6cd5\u3092\u89e3\u8aac\uff01<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/51067\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/image5-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Java\u5165\u9580\u3011toString\u3067\u6570\u5024\u3092\u6587\u5b57\u5217\u3078\u5909\u63db(\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3082\u89e3\u8aac)<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<h4 class=\"wp-block-heading\">Date\u578b\u3084\u305d\u306e\u4ed6\u306e\u578b\u3068\u306e\u578b\u5909\u63db<\/h4>\n\n\n\n<p>Date\u578b\u306a\u3069\u305d\u306e\u4ed6\u306e\u69d8\u3005\u306a\u578b\u3078\u5909\u63db\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3057\u305f\u8a18\u4e8b\u304c\u6b21\u306e\u8a18\u4e8b\u3067\u3059\u3002\u3053\u3061\u3089\u3082\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3055\u308c\u3066\u3044\u307e\u3059\u306e\u3067\u4e00\u8aad\u306e\u4fa1\u5024\u30a2\u30ea\u3067\u3059\u3002<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/19352\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/03\/java_strstr-150x85.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">Java\u3067String\uff08\u6587\u5b57\u5217\uff09\u3092\u5909\u63db\u3059\u308b\u65b9\u6cd5\u307e\u3068\u3081\uff08short,int,long\u7b49\u306b\u5909\u63db\uff09<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<h2 class=\"wp-block-heading\">String\u578b\u3068\u95a2\u9023\u3059\u308b\u30af\u30e9\u30b9<\/h2>\n\n\n\n<p>\u6700\u5f8c\u306b\u6587\u5b57\u5217\u30af\u30e9\u30b9\u306f\u3068\u3066\u3082\u591a\u304f\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u5b58\u5728\u3057\u3066\u304a\u308a\u3044\u308d\u3044\u308d\u306a\u4f7f\u3044\u65b9\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u308c\u3089\u3092\u5168\u3066\u89e3\u8aac\u3057\u3066\u3044\u304f\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u304c\u3001\u62bc\u3055\u3048\u3066\u304a\u3044\u305f\u307b\u3046\u304c\u3044\u3044\u77e5\u8b58\u306b\u3064\u3044\u3066\u3001\u6b21\u306e\u8a18\u4e8b\u3067\u305d\u308c\u305e\u308c\u89e3\u8aac\u3092\u3057\u3066\u3044\u307e\u3059\u306e\u3067\u662f\u975e\u53c2\u8003\u306b\u3057\u3066\u4e0b\u3055\u3044\u3002<\/p>\n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/14982\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/02\/java_stringbuilder-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Java\u8a00\u8a9e\u3011StringBuilder\u306e\u4f7f\u3044\u65b9\u3068\u30e1\u30ea\u30c3\u30c8<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/15654\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/02\/java_stringbuffer-1-150x86.png\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u30105\u5206\u3067\u5206\u304b\u308b\u3011Java\u8a00\u8a9e\u306eStringBuffer\u306e\u4f7f\u3044\u65b9\u3068StringBuilder\u3068\u306e\u9055\u3044<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n            <a href=\"https:\/\/www.sejuku.net\/blog\/19323\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/03\/image1-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Java\u5165\u9580\u3011StringUtils\u306e\u4f7f\u3044\u65b9\u7dcf\u307e\u3068\u3081(Apache Commons Lang)<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n\n\n\n<h2 class=\"wp-block-heading\">\u307e\u3068\u3081<\/h2>\n\n\n\n<p>\u3044\u304b\u304c\u3067\u3057\u305f\u304b\uff1fString\u30af\u30e9\u30b9\u306f\u983b\u7e41\u306b\u4f7f\u3046\u30af\u30e9\u30b9\u3067\u3042\u308b\u305f\u3081\u3001Java\u30d7\u30ed\u30b0\u30e9\u30de\u3068\u3057\u3066\u6d3b\u8e8d\u3059\u308b\u4ee5\u4e0a\u306f\u3001\u7d76\u5bfe\u306b\u5207\u3063\u3066\u3082\u5207\u308a\u96e2\u305b\u306a\u3044\u5b58\u5728\u3067\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305fString\u30af\u30e9\u30b9\u306f\u3068\u3066\u3082\u5965\u304c\u6df1\u3044\u30af\u30e9\u30b9\u3067\u3082\u3042\u308b\u306e\u3067\u3001\u3082\u3057String\u30af\u30e9\u30b9\u306e\u4f7f\u3044\u65b9\u3084\u95a2\u9023\u3057\u305f\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u5fd8\u308c\u3066\u3057\u307e\u3063\u305f\u3089\u3001\u662f\u975e\u3053\u306e\u8a18\u4e8b\u3092\u601d\u3044\u51fa\u3057\u3066\u304f\u3060\u3055\u3044\u306d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u306eString\u30af\u30e9\u30b9\u306e\u4f7f\u3044\u65b9\u3092\u57fa\u790e\u304b\u3089\u5b66\u3073\u305f\u3044\u6587\u5b57\u5217\u306e\u5224\u5b9a\u3084\u5206\u5272\u3001\u9023\u7d50\u306a\u3069\u306e\u65b9\u6cd5\u304c\u308f\u304b\u3089\u306a\u3044\u2026\u6587\u5b57\u5217\u306e\u691c\u7d22\u3084\u6574\u5f62\u306e\u65b9\u6cd5\u304c\u308f\u304b\u3089\u306a\u3044\u2026 Java\u3067\u6587\u5b57\u5217\u3092\u6271\u3046String\u30af\u30e9\u30b9\u306f\u3001\u5358\u306b\u6587\u5b57\u5217\u3092\u6271\u3046\u3060\u3051\u3067\u306a\u304f\u3001\u6587\u5b57\u5217 [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":94482,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"swell_btn_cv_data":"{\"acf7afed\":{\"pv\":1932,\"imp\":1284},\"0950339c\":{\"pv\":1864,\"imp\":1271}}","footnotes":""},"categories":[2344],"tags":[67],"class_list":["post-20546","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java-study","tag-java"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u3010Java String\u30117\u3064\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3067\u6587\u5b57\u5217\u64cd\u4f5c\u3092\u7406\u89e3\u3057\u3088\u3046 | \u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u30d6\u30ed\u30b0<\/title>\n<meta name=\"description\" content=\"\u3053\u306e\u8a18\u4e8b\u3067\u306f\u300c \u3010Java String\u30117\u3064\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3067\u6587\u5b57\u5217\u64cd\u4f5c\u3092\u7406\u89e3\u3057\u3088\u3046 \u300d\u306b\u3064\u3044\u3066\u3001\u8ab0\u3067\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3092\u8aad\u3081\u3070\u3001\u3042\u306a\u305f\u306e\u60a9\u307f\u304c\u89e3\u6c7a\u3059\u308b\u3060\u3051\u3058\u3083\u306a\u304f\u3001\u65b0\u305f\u306a\u6c17\u4ed8\u304d\u3082\u767a\u898b\u3067\u304d\u308b\u3053\u3068\u3067\u3057\u3087\u3046\u3002\u304a\u60a9\u307f\u306e\u65b9\u306f\u305c\u3072\u3054\u4e00\u8aad\u304f\u3060\u3055\u3044\u3002\" \/>\n<meta name=\"robots\" content=\"index, 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