{"id":96990,"date":"2024-03-21T21:25:07","date_gmt":"2024-03-21T12:25:07","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e9%96%8b%e3%81%84%e3%81%a6%e3%81%84%e3%82%8b%e3%81%99%e3%81%b9%e3%81%a6%e3%81%ae%e3%83%8f%e3%83%b3%e3%83%89%e3%83%ab%e3%82%92java%e3%81%a7%e9%96%89\/"},"modified":"2024-04-04T03:16:11","modified_gmt":"2024-04-03T18:16:11","slug":"%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e9%96%8b%e3%81%84%e3%81%a6%e3%81%84%e3%82%8b%e3%81%99%e3%81%b9%e3%81%a6%e3%81%ae%e3%83%8f%e3%83%b3%e3%83%89%e3%83%ab%e3%82%92java%e3%81%a7%e9%96%89","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e9%96%8b%e3%81%84%e3%81%a6%e3%81%84%e3%82%8b%e3%81%99%e3%81%b9%e3%81%a6%e3%81%ae%e3%83%8f%e3%83%b3%e3%83%89%e3%83%ab%e3%82%92java%e3%81%a7%e9%96%89\/","title":{"rendered":"\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u3044\u3066\u3044\u308b\u3059\u3079\u3066\u306e\u30cf\u30f3\u30c9\u30eb\u3092Java\u3067\u9589\u3058\u308b"},"content":{"rendered":"<p>\u5728Java\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u6d41\uff08Stream\uff09\u6765\u64cd\u4f5c\u6587\u4ef6\uff0c\u5305\u62ec\u6253\u5f00\u3001\u8bfb\u53d6\u3001\u5199\u5165\u548c\u5173\u95ed\u6587\u4ef6\u3002\u5173\u95ed\u6587\u4ef6\u65f6\uff0c\u9700\u8981\u786e\u4fdd\u6240\u6709\u7684\u53e5\u67c4\u90fd\u88ab\u6b63\u786e\u5173\u95ed\u4ee5\u91ca\u653e\u8d44\u6e90\u3002<\/p>\n<p>\u30d5\u30a1\u30a4\u30eb\u306b\u5bfe\u3059\u308b\u3059\u3079\u3066\u306e\u30cf\u30f3\u30c9\u30eb\u3092\u30af\u30ed\u30fc\u30ba\u3059\u308b\u305f\u3081\u306e\u4e00\u822c\u7684\u306a\u624b\u6cd5\u3092\u6b21\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.io.*;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">CloseFileExample<\/span> {\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> {\r\n        <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u6587\u4ef6\u5bf9\u8c61<\/span>\r\n        <span class=\"hljs-type\">File<\/span> <span class=\"hljs-variable\">file<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">File<\/span>(<span class=\"hljs-string\">\"path\/to\/file.txt\"<\/span>);\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u58f0\u660e\u6d41\u5bf9\u8c61<\/span>\r\n        <span class=\"hljs-type\">FileReader<\/span> <span class=\"hljs-variable\">fileReader<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-literal\">null<\/span>;\r\n        <span class=\"hljs-type\">BufferedReader<\/span> <span class=\"hljs-variable\">bufferedReader<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-literal\">null<\/span>;\r\n\r\n        <span class=\"hljs-keyword\">try<\/span> {\r\n            <span class=\"hljs-comment\">\/\/ \u5b9e\u4f8b\u5316\u6d41\u5bf9\u8c61<\/span>\r\n            fileReader = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">FileReader<\/span>(file);\r\n            bufferedReader = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">BufferedReader<\/span>(fileReader);\r\n\r\n            <span class=\"hljs-comment\">\/\/ \u4f7f\u7528\u6d41\u5bf9\u8c61\u8fdb\u884c\u6587\u4ef6\u64cd\u4f5c<\/span>\r\n\r\n            <span class=\"hljs-comment\">\/\/ ...<\/span>\r\n\r\n        } <span class=\"hljs-keyword\">catch<\/span> (IOException e) {\r\n            e.printStackTrace();\r\n        } <span class=\"hljs-keyword\">finally<\/span> {\r\n            <span class=\"hljs-comment\">\/\/ \u5173\u95ed\u6d41\u5bf9\u8c61<\/span>\r\n            <span class=\"hljs-keyword\">try<\/span> {\r\n                <span class=\"hljs-keyword\">if<\/span> (bufferedReader != <span class=\"hljs-literal\">null<\/span>) {\r\n                    bufferedReader.close();\r\n                }\r\n                <span class=\"hljs-keyword\">if<\/span> (fileReader != <span class=\"hljs-literal\">null<\/span>) {\r\n                    fileReader.close();\r\n                }\r\n            } <span class=\"hljs-keyword\">catch<\/span> (IOException e) {\r\n                e.printStackTrace();\r\n            }\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u3001\u30d5\u30a1\u30a4\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4f5c\u6210\u3001\u305d\u306e\u5f8c\u306e\u30d5\u30a1\u30a4\u30eb\u30ea\u30fc\u30c0\u30fc\uff08FileReader\uff09\u3068\u30d0\u30c3\u30d5\u30a1\u30fc\u30c9\u30ea\u30fc\u30c0\u30fc\uff08BufferedReader\uff09\u306e\u5ba3\u8a00\u304c\u884c\u308f\u308c\u3066\u3044\u307e\u3059\u3002try\u30d6\u30ed\u30c3\u30af\u5185\u3067\u3001\u3053\u308c\u30892\u3064\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3055\u308c\u3001\u305d\u308c\u3089\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u64cd\u4f5c\u304c\u884c\u308f\u308c\u3066\u3044\u307e\u3059\u3002finally\u30d6\u30ed\u30c3\u30af\u3067\u306f\u3001close()\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3066\u3053\u308c\u30892\u3064\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u9589\u3058\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30d5\u30a1\u30a4\u30eb\u30cf\u30f3\u30c9\u30eb\u304c\u9069\u5207\u306b\u9589\u3058\u3089\u308c\u3066\u30ea\u30bd\u30fc\u30b9\u304c\u89e3\u653e\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>finally\u30d6\u30ed\u30c3\u30af\u3067\u306f\u3001\u30b9\u30c8\u30ea\u30fc\u30e0\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u9589\u3058\u308b\u3068\u304d\u306b\u3001IOException\u4f8b\u5916\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001try-catch\u6587\u3067\u6355\u6349\u3057\u3066\u304f\u3060\u3055\u3044\u3002close()\u30e1\u30bd\u30c3\u30c9\u306fIOException\u4f8b\u5916\u3092\u9001\u51fa\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u3001\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u9589\u3058\u308b\u524d\u306b\u4ed6\u306e\u64cd\u4f5c\u304c\u5fc5\u8981\u306b\u306a\u308b\u53ef\u80fd\u6027\u3082\u3042\u308b\u305f\u3081\u3001\u30b9\u30c8\u30ea\u30fc\u30e0\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u9589\u3058\u308b\u3068\u304d\u306b\u3001\u3053\u308c\u3089\u306e\u64cd\u4f5c\u304c\u9069\u5207\u306b\u51e6\u7406\u3055\u308c\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u3055\u3089\u306b\u3001try-with-resources \u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u4f7f\u7528\u3057\u3066\u3001close() \u30e1\u30bd\u30c3\u30c9\u3092\u660e\u793a\u7684\u306b\u547c\u3073\u51fa\u3059\u3053\u3068\u306a\u304f\u3001\u30b9\u30c8\u30ea\u30fc\u30e0\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u81ea\u52d5\u7684\u306b\u9589\u3058\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4f8b\u3092\u6b21\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.io.*;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">CloseFileExample<\/span> {\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> {\r\n        <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u6587\u4ef6\u5bf9\u8c61<\/span>\r\n        <span class=\"hljs-type\">File<\/span> <span class=\"hljs-variable\">file<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">File<\/span>(<span class=\"hljs-string\">\"path\/to\/file.txt\"<\/span>);\r\n\r\n        <span class=\"hljs-keyword\">try<\/span> (<span class=\"hljs-type\">FileReader<\/span> <span class=\"hljs-variable\">fileReader<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">FileReader<\/span>(file);\r\n             <span class=\"hljs-type\">BufferedReader<\/span> <span class=\"hljs-variable\">bufferedReader<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">BufferedReader<\/span>(fileReader)) {\r\n\r\n            <span class=\"hljs-comment\">\/\/ \u4f7f\u7528\u6d41\u5bf9\u8c61\u8fdb\u884c\u6587\u4ef6\u64cd\u4f5c<\/span>\r\n\r\n            <span class=\"hljs-comment\">\/\/ ...<\/span>\r\n\r\n        } <span class=\"hljs-keyword\">catch<\/span> (IOException e) {\r\n            e.printStackTrace();\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>try-with-resources\u6587\u3067\u306f\u81ea\u52d5\u7684\u306bclose()\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u306a\u304f\u3001\u5b9f\u884c\u7d42\u4e86\u6642\u306b\u4f5c\u6210\u3055\u308c\u305f\u30b9\u30c8\u30ea\u30fc\u30e0\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u9589\u3058\u308b\u3002\u3053\u306e\u65b9\u6cd5\u306fJava 7\u4ee5\u964d\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u5229\u7528\u3067\u304d\u3001\u3088\u308a\u7c21\u6f54\u3067\u5b89\u5168\u3067\u3042\u308b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728Java\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u6d41\uff08Stream\uff09\u6765\u64cd\u4f5c\u6587\u4ef6\uff0c\u5305\u62ec\u6253\u5f00\u3001\u8bfb\u53d6\u3001\u5199\u5165\u548c\u5173\u95ed\u6587\u4ef6\u3002\u5173\u95ed\u6587\u4ef6\u65f6\uff0c\u9700\u8981\u786e\u4fdd\u6240\u6709\u7684\u53e5\u67c4\u90fd\u88ab\u6b63\u786e\u5173\u95ed\u4ee5\u91ca\u653e\u8d44\u6e90\u3002 \u30d5\u30a1\u30a4\u30eb\u306b\u5bfe\u3059\u308b\u3059\u3079\u3066\u306e\u30cf\u30f3\u30c9\u30eb\u3092\u30af\u30ed\u30fc\u30ba\u3059\u308b\u305f\u3081\u306e\u4e00\u822c\u7684\u306a\u624b\u6cd5\u3092\u6b21\u306b\u793a\u3057\u307e\u3059\u3002 [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-96990","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u3044\u3066\u3044\u308b\u3059\u3079\u3066\u306e\u30cf\u30f3\u30c9\u30eb\u3092Java\u3067\u9589\u3058\u308b - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/ja\/blog\/\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u3044\u3066\u3044\u308b\u3059\u3079\u3066\u306e\u30cf\u30f3\u30c9\u30eb\u3092java\u3067\u9589\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u3044\u3066\u3044\u308b\u3059\u3079\u3066\u306e\u30cf\u30f3\u30c9\u30eb\u3092Java\u3067\u9589\u3058\u308b\" \/>\n<meta property=\"og:description\" content=\"\u5728Java\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u6d41\uff08Stream\uff09\u6765\u64cd\u4f5c\u6587\u4ef6\uff0c\u5305\u62ec\u6253\u5f00\u3001\u8bfb\u53d6\u3001\u5199\u5165\u548c\u5173\u95ed\u6587\u4ef6\u3002\u5173\u95ed\u6587\u4ef6\u65f6\uff0c\u9700\u8981\u786e\u4fdd\u6240\u6709\u7684\u53e5\u67c4\u90fd\u88ab\u6b63\u786e\u5173\u95ed\u4ee5\u91ca\u653e\u8d44\u6e90\u3002 \u30d5\u30a1\u30a4\u30eb\u306b\u5bfe\u3059\u308b\u3059\u3079\u3066\u306e\u30cf\u30f3\u30c9\u30eb\u3092\u30af\u30ed\u30fc\u30ba\u3059\u308b\u305f\u3081\u306e\u4e00\u822c\u7684\u306a\u624b\u6cd5\u3092\u6b21\u306b\u793a\u3057\u307e\u3059\u3002 [&hellip;]\" \/>\n<meta property=\"og:url\" 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