{"id":4192,"date":"2024-03-14T12:27:59","date_gmt":"2024-03-14T03:27:59","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ae%e3%83%9e%e3%83%ab%e3%83%81%e3%82%b9%e3%83%ac%e3%83%83%e3%83%89%e3%83%ad%e3%83%83%e3%82%af%e3%81%ae%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b\/"},"modified":"2025-08-02T19:33:28","modified_gmt":"2025-08-02T10:33:28","slug":"java%e3%81%ae%e3%83%9e%e3%83%ab%e3%83%81%e3%82%b9%e3%83%ac%e3%83%83%e3%83%89%e3%83%ad%e3%83%83%e3%82%af%e3%81%ae%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ae%e3%83%9e%e3%83%ab%e3%83%81%e3%82%b9%e3%83%ac%e3%83%83%e3%83%89%e3%83%ad%e3%83%83%e3%82%af%e3%81%ae%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b\/","title":{"rendered":"Java\u306e\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u30ed\u30c3\u30af\u306e\u4f7f\u3044\u65b9\u306f\u4f55\u3067\u3059\u304b\uff1f"},"content":{"rendered":"<p>Java\u3067\u306f\u3001\u8907\u6570\u30b9\u30ec\u30c3\u30c9\u306e\u30ed\u30c3\u30af\u30e1\u30ab\u30cb\u30ba\u30e0\u3092\u5b9f\u88c5\u3059\u308b\u305f\u3081\u306b\u3001synchronized\u30ad\u30fc\u30ef\u30fc\u30c9\u307e\u305f\u306fReentrantLock\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<ol>\n<li>synchronized\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3059\u308b\uff1a<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">MyObject<\/span> {\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">count<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">0<\/span>;\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">synchronized<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">increment<\/span><span class=\"hljs-params\">()<\/span> {\r\n        count++;\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">synchronized<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">decrement<\/span><span class=\"hljs-params\">()<\/span> {\r\n        count--;\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u3001increment()\u30e1\u30bd\u30c3\u30c9\u3068decrement()\u30e1\u30bd\u30c3\u30c9\u306bsynchronized\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u304a\u308a\u3001\u3053\u308c\u306b\u3088\u308a\u3053\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u969b\u306b\u306f\u3001MyObject\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u30ed\u30c3\u30af\u3055\u308c\u3001\u540c\u6642\u306b\u3053\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u30b9\u30ec\u30c3\u30c9\u306f1\u3064\u3057\u304b\u306a\u3044\u3053\u3068\u304c\u78ba\u8a8d\u3055\u308c\u307e\u3059\u3002<\/p>\n<ol>\n<li>ReentrantLock\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\uff1a<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.util.concurrent.locks.Lock;\r\n<span class=\"hljs-keyword\">import<\/span> java.util.concurrent.locks.ReentrantLock;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">MyObject<\/span> {\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">count<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">0<\/span>;\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-type\">Lock<\/span> <span class=\"hljs-variable\">lock<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ReentrantLock<\/span>();\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">increment<\/span><span class=\"hljs-params\">()<\/span> {\r\n        lock.lock();\r\n        <span class=\"hljs-keyword\">try<\/span> {\r\n            count++;\r\n        } <span class=\"hljs-keyword\">finally<\/span> {\r\n            lock.unlock();\r\n        }\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">decrement<\/span><span class=\"hljs-params\">()<\/span> {\r\n        lock.lock();\r\n        <span class=\"hljs-keyword\">try<\/span> {\r\n            count--;\r\n        } <span class=\"hljs-keyword\">finally<\/span> {\r\n            lock.unlock();\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u3001ReentrantLock\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u30ed\u30c3\u30af\u30aa\u30d6\u30b8\u30a7\u30af\u30c8lock\u3092\u4f5c\u6210\u3057\u3001increment()\u30e1\u30bd\u30c3\u30c9\u3068decrement()\u30e1\u30bd\u30c3\u30c9\u3067lock()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30ed\u30c3\u30af\u3092\u304b\u3051\u3001unlock()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30ed\u30c3\u30af\u3092\u89e3\u9664\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30ed\u30c3\u30af\u306e\u53d6\u5f97\u3068\u89e3\u653e\u3092\u3088\u308a\u67d4\u8edf\u306b\u5236\u5fa1\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u306f\u3001\u8907\u6570\u30b9\u30ec\u30c3\u30c9\u306e\u30ed\u30c3\u30af\u30e1\u30ab\u30cb\u30ba\u30e0\u3092\u5b9f\u88c5\u3059\u308b\u305f\u3081\u306b\u3001synchronized\u30ad\u30fc\u30ef\u30fc\u30c9\u307e\u305f\u306fReentrantLock\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 synchronized\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3059\u308b\uff1a publi [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[16,26],"class_list":["post-4192","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-16","tag-26"],"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>Java\u306e\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u30ed\u30c3\u30af\u306e\u4f7f\u3044\u65b9\u306f\u4f55\u3067\u3059\u304b\uff1f - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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