{"id":1089,"date":"2018-12-05T12:00:44","date_gmt":"2018-12-05T03:00:44","guid":{"rendered":"https:\/\/www.bold.ne.jp\/engineer-club\/?p=1089"},"modified":"2025-09-17T14:01:03","modified_gmt":"2025-09-17T05:01:03","slug":"java-split","status":"publish","type":"post","link":"https:\/\/www.bold.ne.jp\/engineer-club\/java-split","title":{"rendered":"Java\u306esplit\u3068\u306f\uff1f\u6587\u5b57\u5217\u3092\u5206\u5272\u3059\u308bsplit\u306e\u4f7f\u3044\u65b9\u3010\u30b5\u30f3\u30d7\u30eb\u4ed8\u304d\u3011"},"content":{"rendered":"<p>String\u306e<span>split<\/span>\u306f\u3001\u6587\u5b57\u5217\u3092\u6307\u5b9a\u3057\u305f\u533a\u5207\u308a\u6587\u5b57\u5217\u3067\u5206\u5272\u3057\u3066\u3001<span>String<\/span>\u306e\u914d\u5217\u3068\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u30dd\u30a4\u30f3\u30c8\u306f\u3001\u533a\u5207\u308a\u6587\u5b57\u5217\u3092\u300c\u6b63\u898f\u8868\u73fe\u300d\u3068\u547c\u3070\u308c\u308b\u30d1\u30bf\u30fc\u30f3\u3067\u6307\u5b9a\u3067\u304d\u308b\u3068\u3044\u3046\u6240\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u305d\u3093\u306a<strong>split\u306e\u4f7f\u3044\u65b9\u3068\u5fdc\u7528\u4f8b<\/strong>\u3092\u304a\u4f1d\u3048\u3057\u307e\u3059\u3002\u898b\u305f\u76ee\u306f\u5358\u7d14\u306a\u6a5f\u80fd\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u304c\u3001\u610f\u5916\u306b\u4f7f\u3044\u51fa\u306e\u3042\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3088<span>!!<\/span><\/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=\"#JavaStringsplitString\">\uff11\uff0e\u3010Java\u3011String.split(String)\u306f\u6b63\u898f\u8868\u73fe\u3067\u6587\u5b57\u5217\u3092\u5206\u5272\u3059\u308b<\/a><ul><li><a href=\"#i\">\uff11-\uff11\uff0e\u6b63\u898f\u8868\u73fe\u3067\u6c17\u3092\u4ed8\u3051\u305f\u3044\u6587\u5b57<\/a><\/li><\/ul><\/li><li><a href=\"#JavaStringsplitString_int\">\uff12\uff0e\u3010Java\u3011String.split(String, int)\u306f\u5206\u5272\u3059\u308b\u6570\u3092\u5236\u9650\u3059\u308b<\/a><\/li><li><a href=\"#split\">\uff13\uff0e\u3010\u5fdc\u7528\u3011split\u306e\u4f7f\u3044\u65b9\u306e\u4f8b<\/a><ul><li><a href=\"#i-2\">\uff13-\uff11\uff0e\u8907\u6570\u306e\u533a\u5207\u308a\u6587\u5b57\u3067\u5206\u5272\u3059\u308b<\/a><\/li><li><a href=\"#i-3\">\uff13-\uff12\uff0e\u8907\u6570\u306e\u7a7a\u767d\u3092\u4e00\u3064\u3068\u3057\u3066\u5206\u5272\u3059\u308b<\/a><\/li><li><a href=\"#i-4\">\uff13-\uff13\uff0e\u6587\u5b57\u5358\u4f4d\u306b\u5206\u5272\u3059\u308b<\/a><\/li><li><a href=\"#i-5\">\uff13-\uff14\uff0e\u6539\u884c\u3067\u5206\u5272\u3059\u308b<\/a><\/li><li><a href=\"#-List\">\uff13-\uff15\uff0e\u5206\u5272\u7d50\u679c\u3092List\u306b\u3059\u308b<\/a><\/li><li><a href=\"#i-6\">\uff13-\uff16\uff0e\u5206\u5272\u6587\u5b57\u81ea\u4f53\u3092\u542b\u3081\u308b<\/a><\/li><\/ul><\/li><li><a href=\"#i-7\">\uff14\uff0e\u307e\u3068\u3081<\/a><\/li><\/ul><\/div>\n<h2><span id=\"JavaStringsplitString\">\uff11\uff0e\u3010Java\u3011String.split(String)\u306f\u6b63\u898f\u8868\u73fe\u3067\u6587\u5b57\u5217\u3092\u5206\u5272\u3059\u308b<\/span><\/h2>\n<p>String\u306e<span>split(String)<\/span>\u306f\u3001\u6587\u5b57\u5217\u3092\u5f15\u6570\u3067\u6307\u5b9a\u3057\u305f\u533a\u5207\u308a\u6587\u5b57\u306e\u6b63\u898f\u8868\u73fe\u306b\u30de\u30c3\u30c1\u3059\u308b\u90e8\u5206\u3067\u5206\u5272\u3057\u305f<span>String<\/span>\u914d\u5217\u3092\u623b\u3057\u307e\u3059\u3002<\/p>\n<p>\u533a\u5207\u308a\u6587\u5b57\u306e\u9593\u306b\u6587\u5b57\u3092\u542b\u307e\u306a\u3044\u90e8\u5206\u304c\u3042\u308b\u5834\u5408\u306f<span>(<\/span>\u4e0b\u8a18\u4f8b\u3067\u306e<span>,,)<\/span>\u3001\u305d\u306e\u90e8\u5206\u306f\u9577\u3055<span>0<\/span>\u306e\u6587\u5b57\u5217\u3068\u306a\u308a\u307e\u3059<span>(null<\/span>\u3067\u306f\u3042\u308a\u307e\u305b\u3093<span>)<\/span>\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String str = \"A,BC,,D\";\r\nString[] split = str.split(\",\");\r\nSystem.out.println(Arrays.toString(split)); \/\/ \u2192 [\"A\", \"BC\", \"\", \"D\"]\r\nSystem.out.println(split .length); \/\/ \u2192 4<\/pre>\n<p>\u6587\u5b57\u5217\u304c\u533a\u5207\u308a\u6587\u5b57\u3092\u542b\u307e\u306a\u3044\u5834\u5408\u306f\u3001\u6587\u5b57\u5217\u304c\u305d\u306e\u307e\u307e\u8a2d\u5b9a\u3055\u308c\u305f\u3001\u9577\u3055<span>1<\/span>\u306e<span>String<\/span>\u914d\u5217\u304c\u623b\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String str = \"A,BC,,D\";\r\nString[] split = str.split(\"\u3042\");\r\nSystem.out.println(Arrays.toString(split)); \/\/ \u2192 [\"A,BC,,D\"] \u203b\u914d\u5217\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b90\u306b\u305d\u306e\u307e\u307e\u5165\u3063\u3066\u3044\u308b\r\nSystem.out.println(split.length); \/\/ \u2192 1<\/pre>\n<p>\u6b63\u898f\u8868\u73fe\u304c\u3088\u304f\u308f\u304b\u3089\u306a\u3044\u5834\u5408\u3067\u3082\u3001\u57fa\u672c\u7684\u306b\u306f\u533a\u5207\u308a\u6587\u5b57\u5217\u3092\u305d\u306e\u307e\u307e\u6307\u5b9a\u3057\u3066\u3082\u3089\u3063\u3066\u69cb\u3044\u307e\u305b\u3093\u3002\u52d5\u4f5c\u304c\u304a\u304b\u3057\u3044\u5834\u5408\u306f\u3001\u5f8c\u8ff0\u3059\u308b\u300c\u6b63\u898f\u8868\u73fe\u3067\u7279\u5225\u306a\u610f\u5473\u3092\u6301\u3064\u6587\u5b57\u300d\u3092\u542b\u3081\u3066\u3044\u306a\u3044\u304b\u78ba\u8a8d\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3><span id=\"i\">\uff11-\uff11\uff0e\u6b63\u898f\u8868\u73fe\u3067\u6c17\u3092\u4ed8\u3051\u305f\u3044\u6587\u5b57<\/span><\/h3>\n<p>split\u3067\u306e\u533a\u5207\u308a\u6587\u5b57\u306f\u3001\u6b63\u898f\u8868\u73fe\u3060\u3068\u3044\u3046\u3053\u3068\u306b\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002\u6b63\u898f\u8868\u73fe\u3067\u306f\u7279\u5225\u306a\u610f\u5473\u3092\u6301\u3064\u6587\u5b57\u304c\u3044\u304f\u3064\u304b\u3042\u308b\u306e\u3067\u3001\u30d1\u30c3\u3068\u898b\u3069\u304a\u308a\u306b\u52d5\u304b\u306a\u3044\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u6b63\u898f\u8868\u73fe\u3067\u6c17\u3092\u4ed8\u3051\u305f\u3044\u6587\u5b57\u306f\u3001\u6982\u306d\u4ee5\u4e0b\u306e\u3082\u306e\u3067\u3059\u3002\u6587\u8108\u306b\u3088\u3063\u3066\u610f\u5473\u304c\u3042\u3063\u305f\u308a\u306a\u304b\u3063\u305f\u308a\u3057\u307e\u3059\u3002<\/p>\n<p><strong>[]-.+*?()|^$<\/strong><\/p>\n<p>\u4f8b\u3048\u3070\u3001<span>&#8220;.&#8221;<\/span>\u306f\u6b63\u898f\u8868\u73fe\u3060\u3068\u300c\u4f55\u304b\u306e<span>1<\/span>\u6587\u5b57\u300d\u3092\u610f\u5473\u3057\u307e\u3059\u3002<span>&#8220;.&#8221;<\/span>\u305d\u306e\u3082\u306e\u3092\u533a\u5207\u308a\u6587\u5b57\u306b\u3057\u305f\u3044\u5834\u5408\u306f\u3001<span>\\<\/span>\u3067\u30a8\u30b9\u30b1\u30fc\u30d7\u3057\u3066\u6b63\u898f\u8868\u73fe\u3068\u3057\u3066\u306e\u610f\u5473\u3092\u6253\u3061\u6d88\u3059\u304b\u3001<span>java.util.regex.Pattern<\/span>\u306e<span>quote<\/span>\u306a\u3069\u3092\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String str = \"A.BC..D\";\r\nString[] split1 = str.split(\".\");\r\nString[] split2 = str.split(\"\\\\.\");\r\nString[] split4 = str.split(Pattern.quote(\".\"));\r\nString[] split3 = str.split(\"[.]\");\r\nSystem.out.println(Arrays.toString(split1)); \/\/ \u2192 [] \u203b\u9577\u30550\u306e\u6587\u5b57\u5217\r\nSystem.out.println(Arrays.toString(split2)); \/\/ \u2192 [\"A\", \"BC\", \"\", \"D\"]\r\nSystem.out.println(Arrays.toString(split3)); \/\/ \u2192 \u540c\u4e0a\r\nSystem.out.println(Arrays.toString(split4)); \/\/ \u2192 \u540c\u4e0a<\/pre>\n<h2><span id=\"JavaStringsplitString_int\">\uff12\uff0e\u3010Java\u3011String.split(String, int)\u306f\u5206\u5272\u3059\u308b\u6570\u3092\u5236\u9650\u3059\u308b<\/span><\/h2>\n<p>split\u306b\u306f\u3001\u4e8c\u756a\u76ee\u306b<span>int<\/span>\u306e\u5f15\u6570\u3092\u6301\u3064\u30e1\u30bd\u30c3\u30c9\u3082\u3042\u308a\u307e\u3059\u3002\u3053\u306e<span>int<\/span>\u306f\u3001\u5206\u5272\u3059\u308b\u6570\u3092\u5236\u9650\u3059\u308b\u306e\u306b\u4f7f\u3044\u3001\u8ca0\u306e\u6570\u5024\u3001<span>0<\/span>\u3001\u6b63\u306e\u6570\u5024\u3067\u610f\u5473\u304c\u9055\u3063\u3066\u304d\u307e\u3059\u3002<\/p>\n<p>\u8ca0\u306e\u6570\u5b57\u3092\u6307\u5b9a\u3059\u308b\u3068\u3001\u5168\u3066\u306e\u533a\u5207\u308a\u6587\u5b57\u3067\u5206\u5272\u3057\u305f\u7d50\u679c\u3068\u306a\u308a\u307e\u3059\u3002\u4e2d\u8eab\u304c\u7a7a\u3067\u3082\u3001\u5168\u3066\u306e\u8981\u7d20\u3092\u53d6\u5f97\u3057\u305f\u3044\u5834\u5408\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String str = \"A,B,C,,,\";\r\nString[] split = str.split(\",\", -1);\r\nSystem.out.println(Arrays.toString(split)); \/\/ \u2192 [\"A\", \"B\", \"C\", \"\", \"\", \"\"]\r\nSystem.out.println(split.length); \/\/ \u2192 6<\/pre>\n<p>0\u3092\u6307\u5b9a\u3059\u308b\u3068\u3001\u5206\u5272\u7d50\u679c\u306e\u5f8c\u308d\u90e8\u5206\u3067\u3001\u5024\u3092\u6301\u305f\u306a\u3044\u90e8\u5206\u304c\u7701\u7565\u3055\u308c\u307e\u3059\u3002\u5024\u304c\u7a7a\u306e\u90e8\u5206\u306f\u3044\u3089\u306a\u3044\u5834\u5408\u306b\u4f7f\u3044\u307e\u3059\u3002<span>split(String)<\/span>\u306f\u3053\u306e\u52d5\u304d\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String str = \"A,B,C,,,\";\r\nString[] split = str.split(\",\", 0);\r\nSystem.out.println(Arrays.toString(split)); \/\/ \u2192 [\"A\", \"B\", \"C\"]\r\nSystem.out.println(split.length); \/\/ \u2192 3<\/pre>\n<p>\u6b63\u306e\u6570\u5024\u3092\u6307\u5b9a\u3059\u308b\u3068\u3001\u5148\u982d\u304b\u3089\u6307\u5b9a\u3057\u305f\u6570\u3060\u3051\u5206\u5272\u3057\u307e\u3059\u3002\u6b8b\u308a\u306e\u90e8\u5206\u306f\u533a\u5207\u308a\u6587\u5b57\u304c\u5165\u3063\u305f\u307e\u307e\u306b\u306a\u308a\u307e\u3059\u3002\u4e00\u90e8\u5206\u3060\u3051\u5206\u5272\u3057\u305f\u3044\u5834\u5408\u306b\u4fbf\u5229\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String str = \"A,B,C,,,\";\r\n\r\nString[] split1 = str.split(\",\", 1);\r\nSystem.out.println(Arrays.toString(split1)); \/\/ \u2192 [\"A,B,C,,,\"]\r\nSystem.out.println(split1.length); \/\/ \u2192 1\r\n\r\nString[] split2 = str.split(\",\", 2);\r\nSystem.out.println(Arrays.toString(split2)); \/\/ \u2192 [\"A\", \"B,C,,,\"]\r\nSystem.out.println(split2.length); \/\/ \u2192 2\r\n\r\nString[] split3 = str.split(\",\", 3);\r\nSystem.out.println(Arrays.toString(split3)); \/\/ \u2192 [\"A\", \"B\", \"C,,,\"]\r\nSystem.out.println(split3.length); \/\/ \u2192 3<\/pre>\n<h2><span id=\"split\">\uff13\uff0e\u3010\u5fdc\u7528\u3011<span>split<\/span>\u306e\u4f7f\u3044\u65b9\u306e\u4f8b<\/span><\/h2>\n<h3><span id=\"i-2\">\uff13-\uff11\uff0e\u8907\u6570\u306e\u533a\u5207\u308a\u6587\u5b57\u3067\u5206\u5272\u3059\u308b<\/span><\/h3>\n<p>\u4eca\u307e\u3067\u306e\u4f8b\u3067\u306f\u533a\u5207\u308a\u6587\u5b57\u3092\u4e00\u3064\u3060\u3051\u4f7f\u3063\u3066\u3044\u307e\u3057\u305f\u3002\u3067\u3059\u304c\u3001\u533a\u5207\u308a\u6587\u5b57\u306f\u6b63\u898f\u8868\u73fe\u3067\u3059\u306e\u3067\u8907\u6570\u306e\u6587\u5b57\u3092\u4f7f\u3048\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u4f8b\u3067\u306f\u3001<span>&#8220;=&#8221;<\/span>\u3068<span>&#8220;,&#8221;<\/span>\u306e\u4e8c\u3064\u3092\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u6587\u5b57\u5217\u306e\u66f8\u5f0f\u304c\u56fa\u5b9a\u3067\u3042\u308c\u3070\u3001\u306a\u304b\u306a\u304b\u4fbf\u5229\u306b\u4f7f\u3048\u307e\u3059\u3088\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String str = \"KEY=VALUE1,VALUE2,VALUE3\";\r\nString[] split = str.split(\"[=,]\");\r\nSystem.out.println(Arrays.toString(split)); \/\/ \u2192 [\"KEY\", \"VALUE1\", \"VALUE2\", \"VALUE3\"]\r\nSystem.out.println(split.length); \/\/ \u2192 4<\/pre>\n<h3><span id=\"i-3\">\uff13-\uff12\uff0e\u8907\u6570\u306e\u7a7a\u767d\u3092\u4e00\u3064\u3068\u3057\u3066\u5206\u5272\u3059\u308b<\/span><\/h3>\n<p>\u8907\u6570\u306e\u7a7a\u767d\u3092\u4e00\u3064\u3068\u3057\u3066\u5206\u5272\u3059\u308b\u3053\u3068\u3082\u7c21\u5358\u3067\u3059\u3002\u6b63\u898f\u8868\u73fe\u306e<span>+<\/span>\u3092\u4f7f\u3063\u3066\u3001\u9023\u7d9a\u3059\u308b\u533a\u5207\u308a\u6587\u5b57\u3092<span>1<\/span>\u3064\u306b\u307f\u306a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String str = \"A    B  C        D\";\r\nString[] split = str.split(\" +\");\r\nSystem.out.println(Arrays.toString(split)); \/\/ \u2192 [\"A\", \"B\", \"C\", \"D\"]\r\nSystem.out.println(split.length); \/\/ \u2192 4<\/pre>\n<h3><span id=\"i-4\">\uff13-\uff13\uff0e\u6587\u5b57\u5358\u4f4d\u306b\u5206\u5272\u3059\u308b<\/span><\/h3>\n<p>\u6587\u5b57\u5358\u4f4d\u306b\u5206\u5272\u3057\u305f\u3044\u5834\u5408\u306f\u3001\u533a\u5207\u308a\u6587\u5b57\u3092<span>&#8220;&#8221;<\/span>\u3068\u3059\u308b\u3068\u3044\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u5c11\u3005\u88cf\u6280\u30c1\u30c3\u30af\u3067\u3059\u304c\u3001\u6587\u5b57\u306e\u9593\u306e\u7a7a\u6587\u5b57\u5217\u306b\u30de\u30c3\u30c1\u3057\u3066\u3044\u308b\u3068\u8003\u3048\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String str = \"ABCDEF\";\r\nString[] split = str.split(\"\");\r\nSystem.out.println(Arrays.toString(split)); \/\/ \u2192 [\"A\", \"B\", \"C\", \"D\", \"E\", \"F\"]\r\nSystem.out.println(split.length); \/\/ \u2192 6<\/pre>\n<h3><span id=\"i-5\">\uff13-\uff14\uff0e\u6539\u884c\u3067\u5206\u5272\u3059\u308b<\/span><\/h3>\n<p>\u6539\u884c\u3067\u5206\u5272\u3057\u305f\u3044\u5834\u5408\u306f\u3001\u5358\u7d14\u306b\u6539\u884c\u3092\u533a\u5207\u308a\u6587\u5b57\u3068\u3059\u308c\u3070<span>OK<\/span>\u3067\u3059\u3002\u672b\u5c3e\u306e\u7a7a\u884c\u3082\u6b32\u3057\u3044\u306a\u3089\u3001<span>2<\/span>\u756a\u76ee\u306e\u5f15\u6570\u306b\u30de\u30a4\u30ca\u30b9\u306e\u6570\u5024\u3092\u6307\u5b9a\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String str = \"A\\nBC\\n\\nD\";\r\nString[] split = str.split(\"\\n\");\r\nSystem.out.println(Arrays.toString(split)); \/\/ \u2192 [\"A\", \"BC\", \"\", \"D\"]\r\nSystem.out.println(split.length); \/\/ \u2192 4<\/pre>\n<p>\u8907\u6570\u306e\u7a2e\u985e\u306e\u6539\u884c\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u306a\u3089\u3001\u305d\u308c\u3089\u3092\u6b63\u898f\u8868\u73fe\u3067<span>or<\/span>\u6307\u5b9a\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String str = \"A\\nBC\\r\\n\\rD\";\r\nString[] split = str.split(\"\\r\\n|\\r|\\n\");\r\nSystem.out.println(Arrays.toString(split)); \/\/ \u2192 [\"A\", \"BC\", \"\", \"D\"]\r\nSystem.out.println(split.length); \/\/ \u2192 4<\/pre>\n<h3><span id=\"-List\">\uff13-\uff15\uff0e\u5206\u5272\u7d50\u679c\u3092<span>List<\/span>\u306b\u3059\u308b<\/span><\/h3>\n<p>split\u306f\u5206\u5272\u7d50\u679c\u3092<span>String<\/span>\u306e\u914d\u5217\u3067\u623b\u3057\u307e\u3059\u3002\u3067\u3082<span>List<\/span>\u306e\u65b9\u304c\u4f7f\u3044\u3084\u3059\u3044\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u306e\u3067\u3001<span>java.util.Arrays<\/span>\u306e<span>asList<\/span>\u3092\u4f7f\u3063\u3066\u3001<span>List<\/span>\u306b\u5909\u63db\u3059\u308b\u306e\u304c\u304a\u624b\u8efd\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String str = \"A,BC,,D\";\r\nList&lt;String&gt; split = Arrays.asList(str.split(\",\"));\r\nSystem.out.println(split); \/\/ \u2192 [\"A\", \"BC\", \"\", \"D\"]\r\nSystem.out.println(split.size()); \/\/ \u2192 4<\/pre>\n<h3><span id=\"i-6\">\uff13-\uff16\uff0e\u5206\u5272\u6587\u5b57\u81ea\u4f53\u3092\u542b\u3081\u308b<\/span><\/h3>\n<p>\u5c11\u3057\u7279\u5225\u306a\u6b63\u898f\u8868\u73fe\u306e\u66f8\u304d\u65b9\u3092\u3059\u308c\u3070\u3001\u5206\u5272\u306b\u4f7f\u3063\u305f\u6587\u5b57\u5217\u305d\u306e\u3082\u306e\u3092\u7d50\u679c\u306b\u542b\u3081\u3089\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u6b63\u898f\u8868\u73fe\u306e\u5148\u8aad\u307f\u30fb\u5f8c\u8aad\u307f\u3068\u547c\u3070\u308c\u308b\u6a5f\u80fd\u3092\u4f7f\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u5f8c\u308d\u306b\u4ed8\u3051\u308b\u5834\u5408\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String str = \"A,BC,,D\";\r\nString[] split = str.split(\"(?&lt;=,)\");\r\nSystem.out.println(Arrays.toString(split)); \/\/ \u2192 [\"A,\", \"BC,\", \",\", \"D\"]\r\nSystem.out.println(split.length); \/\/ \u2192 4<\/pre>\n<p>\u524d\u306b\u4ed8\u3051\u308b\u5834\u5408\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String str = \"A,BC,,D\";\r\nString[] split = str.split(\"(?=,)\");\r\nSystem.out.println(Arrays.toString(split)); \/\/ \u2192 [\"A\", \",BC\", \",\", \",D\"]\r\nSystem.out.println(split.length); \/\/ \u2192 4<\/pre>\n<h2><span id=\"i-7\">\uff14\uff0e\u307e\u3068\u3081<\/span><\/h2>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f<span>String<\/span>\u306e<span>split<\/span>\u3092\u7d39\u4ecb\u3057\u307e\u3057\u305f\u3002\u5f15\u6570\u306b\u6307\u5b9a\u3057\u305f\u6b63\u898f\u8868\u73fe\u306b\u30de\u30c3\u30c1\u3059\u308b\u3082\u306e\u3092\u533a\u5207\u308a\u6587\u5b57\u3068\u3057\u3001\u6587\u5b57\u5217\u3092\u5206\u5272\u3057\u3066\u914d\u5217\u306b\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u4e8c\u756a\u76ee\u306e\u5f15\u6570\u306e\u6570\u5024\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u3069\u306e\u3088\u3046\u306a\u914d\u5217\u306b\u3059\u308b\u304b\u3092\u6307\u5b9a\u51fa\u6765\u305f\u308a\u3082\u3057\u307e\u3059\u3002<\/p>\n<p>split\u306e\u4f7f\u3044\u65b9\u306f\u7c21\u5358\u3067\u3059\u304c\u3001\u6307\u5b9a\u3067\u304d\u308b\u3082\u306e\u304c\u6b63\u898f\u8868\u73fe\u3067\u3042\u308b\u3053\u3068\u3092\u6d3b\u304b\u3059\u3068\u3001\u306a\u304b\u306a\u304b\u30d1\u30ef\u30d5\u30eb\u306b\u4f7f\u3048\u305f\u308a\u3082\u3057\u307e\u3059\u3002\u305c\u3072\u6b63\u898f\u8868\u73fe\u306b\u3064\u3044\u3066\u5b66\u3093\u3067\u3001<span>split<\/span>\u3092\u4fbf\u5229\u306b\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>String\u306esplit\u306f\u3001\u6587\u5b57\u5217\u3092\u6307\u5b9a\u3057\u305f\u533a\u5207\u308a\u6587\u5b57\u5217\u3067\u5206\u5272\u3057\u3066\u3001String\u306e\u914d\u5217\u3068\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u30dd\u30a4\u30f3\u30c8\u306f\u3001\u533a\u5207\u308a\u6587\u5b57\u5217\u3092\u300c\u6b63\u898f\u8868\u73fe\u300d\u3068\u547c\u3070\u308c\u308b\u30d1\u30bf\u30fc\u30f3\u3067\u6307\u5b9a\u3067\u304d\u308b\u3068\u3044\u3046\u6240\u3067\u3059\u3002 \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u305d\u3093\u306asplit [&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\/1089"}],"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=1089"}],"version-history":[{"count":7,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/1089\/revisions"}],"predecessor-version":[{"id":5711,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/1089\/revisions\/5711"}],"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=1089"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/categories?post=1089"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}