{"id":21229,"date":"2017-06-07T14:45:54","date_gmt":"2017-06-07T05:45:54","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=21229"},"modified":"2024-05-06T11:41:30","modified_gmt":"2024-05-06T02:41:30","slug":"%e3%80%90java%e5%85%a5%e9%96%80%e3%80%91file%e3%81%aelistfiles%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%be%e3%81%a8%e3%82%81","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/21229","title":{"rendered":"\u3010Java\u5165\u9580\u3011File\u306elistFiles\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u691c\u7d22\u3057\u3066\u4e00\u89a7\u3092\u53d6\u5f97"},"content":{"rendered":"<p>Java\u3067\u306f\u30d5\u30a1\u30a4\u30eb\u3084\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306e\u4e00\u89a7\u3092\u53d6\u5f97\u3067\u304d\u308blistFiles\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u305d\u3093\u306alistFiles\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u3001\u4ee5\u4e0b\u306e\u5185\u5bb9\u3067\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<br \/>\n<div class=\"box01\"><\/p>\n<ul>\n<li><b>\u3010\u57fa\u790e\u3011listFiles\u3068\u306f<\/b><\/li>\n<li><b>\u3010\u57fa\u790e\u3011listFiles\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/b><\/li>\n<li><b>\u3010\u767a\u5c55\u3011listFiles\u306e\u6ce8\u610f\u70b9<\/b><\/li>\n<li><b>\u3010\u767a\u5c55\u3011\u6307\u5b9a\u3057\u305f\u30d1\u30b9\u306e\u4e00\u89a7\u3092\u53d6\u5f97\u3059\u308b<\/b><\/li>\n<li><b>\u3010\u767a\u5c55\u3011\u30d5\u30a1\u30a4\u30eb\u30ea\u30b9\u30c8\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3059\u308b<\/b><\/li>\n<\/ul>\n<\/div>\n<p>\u306a\u3069\u306e\u5fdc\u7528\u7684\u306a\u4f7f\u3044\u65b9\u306b\u95a2\u3057\u3066\u3082\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002\u4eca\u56de\u306f\u305d\u3093\u306alistFiles\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u3001\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u307e\u3059\uff01<\/p>\n<p>\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<h2>listFiles\u3068\u306f<\/h2>\n<p>File\u30af\u30e9\u30b9\u306elistFiles\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6307\u5b9a\u3057\u305f\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u542b\u307e\u308c\u308b\u30d5\u30a1\u30a4\u30eb\u3084\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3092\u914d\u5217\u3068\u3057\u3066\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">public File[] listFiles()<\/pre>\n<p>listFiles\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308c\u3070\u3001File\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u914d\u5217\u306b\u3001\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3084\u30d5\u30a1\u30a4\u30eb\u3092\u4e00\u89a7\u3068\u3057\u3066\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4e3b\u306b\u6307\u5b9a\u3057\u305f\u30d1\u30b9\u306e\u4e2d\u8eab\u3092\u8abf\u3079\u305f\u3044\u3068\u304d\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<h2>listFiles\u306e\u4f7f\u3044\u65b9<\/h2>\n<p>\u4ee5\u4e0b\u306blistFiles\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u305f\u3001\u6307\u5b9a\u3057\u305f\u30d1\u30b9\u306b\u5b58\u5728\u3059\u308b\u30d5\u30a1\u30a4\u30eb\u30fb\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:java decode:true \">import java.io.File;\r\n\r\npublic class ListFiles {\r\n \r\n    public static void main(String[] args) {\r\n        \/\/File\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\u3059\u308b\r\n        File dir = new File(\"\/Users\/Shared\/java\/\");\r\n        \r\n        \/\/listFiles\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u4e00\u89a7\u3092\u53d6\u5f97\u3059\u308b\r\n        File[] list = dir.listFiles();\r\n        \r\n        System.out.println(list.length);\r\n    }\r\n\r\n}<\/pre>\n<p>\u30b5\u30f3\u30d7\u30eb\u3067\u306fFile\u30af\u30e9\u30b9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210\u6642\u306e\u5f15\u6570\u306b\u3001<b>\u53d6\u5f97\u3059\u308b\u5bfe\u8c61\u306e\u30d1\u30b9\u3092\u6307\u5b9a\u3057\u3001listFiles\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u4e00\u89a7\u3092\u53d6\u5f97<\/b>\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>listFiles\u306e\u6ce8\u610f\u70b9<\/h3>\n<p>listFiles\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6307\u5b9a\u3057\u305f\u30d1\u30b9\u540d\u304c\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3092\u793a\u3055\u306a\u3044\u5834\u5408\u3084\u3001\u5165\u51fa\u529b\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306fnull\u3092\u8fd4\u3057\u307e\u3059\u3002\u3082\u3057\u3001null\u306e\u72b6\u614b\u3067\u305d\u306e\u307e\u307e\u30d5\u30a1\u30a4\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u914d\u5217\u3092\u53c2\u7167\u3059\u308b\u3068\u3001<b>java.lang.NullPointerException\u306e\u4f8b\u5916\u304c\u767a\u751f<\/b>\u3057\u307e\u3059\u306e\u3067\u3001\u4e8b\u524d\u306bnull\u30c1\u30a7\u30c3\u30af\u3092\u3057\u3066\u304a\u3044\u305f\u307b\u3046\u304c\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u4ee5\u4e0b\u306b\u30d5\u30a1\u30a4\u30eb\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u914d\u5217\u304c\u3001null\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u65b9\u6cd5\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:java decode:true \">import java.io.File;\r\n\r\npublic class ListFiles {\r\n \r\n    public static void main(String[] args) {\r\n        \/\/File\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\u3059\u308b\r\n        File dir = new File(\"\/Users\/Shared\/java\/\");\r\n        \r\n        \/\/listFiles\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u4e00\u89a7\u3092\u53d6\u5f97\u3059\u308b\r\n        File[] list = dir.listFiles();\r\n        \r\n        if(list != null) {\r\n            System.out.println(list.length);\r\n        } else {\r\n            System.out.println(\"null\");\r\n        }\r\n    }\r\n\r\n}<\/pre>\n<h2>\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3068\u30d5\u30a1\u30a4\u30eb\u306e\u4e00\u89a7\u3092\u53d6\u5f97\u3059\u308b<\/h2>\n<p>listFiles\u30e1\u30bd\u30c3\u30c9\u3067\u53d6\u5f97\u3057\u305fFile\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u914d\u5217\u304c\u3001<b>\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u304b\u30d5\u30a1\u30a4\u30eb\u304b\u5224\u5225<\/b>\u3059\u308b\u306b\u306f\u3001File\u30af\u30e9\u30b9\u306eisFile\u30e1\u30bd\u30c3\u30c9\u3068\u3001isDirectory\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002isFile\u30e1\u30bd\u30c3\u30c9\u3068isDirectory\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u305d\u308c\u305e\u308c\u5bfe\u8c61\u304c\u30d5\u30a1\u30a4\u30eb\u304b\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3060\u3063\u305f\u3089true\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306blistFiles\u30e1\u30bd\u30c3\u30c9\u3067\u53d6\u5f97\u3057\u305f\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306e\u4e00\u89a7\u3092\u3001\u30d5\u30a1\u30a4\u30eb\u3068\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3067\u5224\u5225\u3059\u308b\u65b9\u6cd5\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:java decode:true \">import java.io.File;\r\n\r\npublic class ListFiles {\r\n \r\n    public static void main(String[] args) {\r\n        \/\/File\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\u3059\u308b\r\n        File dir = new File(\"\/Users\/Shared\/java\");\r\n        \r\n        \/\/listFiles\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u4e00\u89a7\u3092\u53d6\u5f97\u3059\u308b\r\n        File[] list = dir.listFiles();\r\n        \r\n        if(list != null) {\r\n            \r\n            for(int i=0; i&lt;list.length; i++) {\r\n                \r\n                \/\/\u30d5\u30a1\u30a4\u30eb\u306e\u5834\u5408\r\n                if(list[i].isFile()) {\r\n                    System.out.println(\"\u30d5\u30a1\u30a4\u30eb\u3067\u3059 : \" + list[i].toString());\r\n                }\r\n                \/\/\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306e\u5834\u5408\r\n                else if(list[i].isDirectory()) {\r\n                    System.out.println(\"\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3067\u3059 : \" + list[i].toString());\r\n                }\r\n            }\r\n        } else {\r\n            System.out.println(\"null\");\r\n        }\r\n    }\r\n\r\n}<\/pre>\n<p>\u30b5\u30f3\u30d7\u30eb\u3067\u306flistFiles\u30e1\u30bd\u30c3\u30c9\u3067\u53d6\u5f97\u3057\u305f\u4e00\u89a7\u3092\u3001\u30eb\u30fc\u30d7\u3067\u56de\u3057\u3066isFile\u30e1\u30bd\u30c3\u30c9\u3068isDirectory\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u30d5\u30a1\u30a4\u30eb\u307e\u305f\u306f\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u304b\u5224\u5225\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u30d5\u30a1\u30a4\u30eb\u30ea\u30b9\u30c8\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3059\u308b<\/h2>\n<p>listFiles\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u306e\u4e00\u89a7\u3092\u53d6\u5f97\u3059\u308b\u3068\u304d\u3001\u7279\u5b9a\u306e\u6761\u4ef6\u306e\u30d5\u30a1\u30a4\u30eb\u306e\u307f<b>\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3057\u3066\u53d6\u5f97\u3057\u305f\u3044\u5834\u5408<\/b>\u304c\u3042\u308a\u307e\u3059\u3002\u30d5\u30a1\u30a4\u30eb\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3059\u308b\u5834\u5408\u306b\u306f\u3001FilenameFilter\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u6307\u5b9a\u3057\u305f\u6761\u4ef6\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>FilenameFilter\u30af\u30e9\u30b9\u306f\u3001\u4ee5\u4e0b\u306e\u30d1\u30c3\u30b1\u30fc\u30b8\u3092\u30a4\u30f3\u30dd\u30fc\u30c8\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">import java.io.FilenameFilter;<\/pre>\n<p>\u4ee5\u4e0b\u306blistFiles\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u53d6\u5f97\u3057\u305f\u4e00\u89a7\u3092FilenameFilter\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3059\u308b\u65b9\u6cd5\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:java decode:true \">import java.io.File;\r\nimport java.io.FilenameFilter;\r\n\r\npublic class ListFiles {\r\n \r\n    public static void main(String[] args) {\r\n        \/\/\u30d5\u30a3\u30eb\u30bf\u3092\u4f5c\u6210\u3059\u308b\r\n        FilenameFilter filter = new FilenameFilter(){\r\n            public boolean accept(File file, String str){\r\n                \r\n                \/\/\u6307\u5b9a\u6587\u5b57\u5217\u3067\u30d5\u30a3\u30eb\u30bf\u3059\u308b\r\n                if(str.indexOf(\"java\") != -1) {\r\n                    return true;\r\n                } else {\r\n                    return false;\r\n                }\r\n            }\r\n        };\r\n        \r\n        \/\/listFiles\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u4e00\u89a7\u3092\u53d6\u5f97\u3059\u308b\r\n        File[] list = new File(\"\/Users\/Shared\/java\").listFiles(filter);\r\n        \r\n        if(list != null) {\r\n            \r\n            for(int i=0; i&lt;list.length; i++) {\r\n                \r\n                \/\/\u30d5\u30a1\u30a4\u30eb\u306e\u5834\u5408\r\n                if(list[i].isFile()) {\r\n                    System.out.println(\"\u30d5\u30a1\u30a4\u30eb\u3067\u3059 : \" + list[i].toString());\r\n                }\r\n                \/\/\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306e\u5834\u5408\r\n                else if(list[i].isDirectory()) {\r\n                    System.out.println(\"\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3067\u3059 : \" + list[i].toString());\r\n                }\r\n            }\r\n        } else {\r\n            System.out.println(\"null\");\r\n        }\r\n    }\r\n\r\n}<\/pre>\n<p>\u30b5\u30f3\u30d7\u30eb\u3067\u4f7f\u7528\u3057\u305f\u30d5\u30a1\u30a4\u30eb\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3059\u308bFilenameFilter\u30af\u30e9\u30b9\u306b\u3064\u3044\u3066\u306f\u3001\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\uff01<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/20707\" 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\/04\/java_filefilter-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Java\u5165\u9580\u3011\u30d5\u30a3\u30eb\u30bf\u3092\u4f7f\u7528\u3057\u3066File\u3092\u4e00\u89a7\u5316\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<h2>File\u3067\u306e\u8aad\u307f\u66f8\u304d\u3001\u30b3\u30d4\u30fc\u3001delete\u306a\u3069\u3092\u7d39\u4ecb<\/h2>\n<p>File\u30af\u30e9\u30b9\u3092\u4f7f\u3063\u305f\u30d5\u30a1\u30a4\u30eb\u306e\u8aad\u307f\u8fbc\u307f\u3001\u66f8\u304d\u8fbc\u307f\u3001\u30b3\u30d4\u30fc\u3001delete\u3084exists\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9\u306a\u3069\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u3061\u3089\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u306d\u3002<\/p>\n            <a 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