{"id":985,"date":"2021-03-16T18:44:10","date_gmt":"2021-03-16T09:44:10","guid":{"rendered":"https:\/\/www.opentone.co.jp\/ot-lab\/?p=985"},"modified":"2025-05-12T10:06:19","modified_gmt":"2025-05-12T01:06:19","slug":"cat-singleton","status":"publish","type":"post","link":"https:\/\/www.opentone.co.jp\/ot-lab\/all\/web-system\/cat-singleton","title":{"rendered":"\u30cd\u30b3\u3067\u308f\u304b\u308b\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3 1\u56de\u76ee -Singleton-"},"content":{"rendered":"\n<p>\u3053\u3093\u306b\u3061\u306f\u3001Nit\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4eca\u56de\u304b\u3089\u59cb\u307e\u308b\u300e\u30cd\u30b3<strong>\u3067<\/strong>\u308f\u304b\u308b\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u300f\u3067\u306f\u3001<br>\u8efd\u3044\u6c17\u6301\u3061\u3067\u3056\u3063\u304f\u308a\u3068\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u3092\u3054\u7d39\u4ecb\u3057\u3066\u3044\u3053\u3046\u3068\u601d\u3044\u307e\u3059\u3002<br>\u300e\u30cd\u30b3<strong>\u3067\u3082<\/strong>\u300f\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3042\u3057\u304b\u3089\u305a\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Singleton\u30d1\u30bf\u30fc\u30f3<\/h3>\n\n\n\n<p>1\u56de\u76ee\u306fSingleton\u30d1\u30bf\u30fc\u30f3\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>Singleton\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u30b7\u30b9\u30c6\u30e0\u306e\u4e2d\u3067\u300c\uff11\u3064\u3060\u3051\u3057\u304b\u6301\u3061\u305f\u304f\u306a\u3044\u300d\u3068\u3044\u3046\u7269\u304c\u3042\u308b\u3068\u304d\u306b\u4f7f\u3044\u307e\u3059\u3002<br>\u6709\u540d\u306a\u3068\u3053\u308d\u3067\u8a00\u3046\u3068Java\u306eCalender\uff08\u30ab\u30ec\u30f3\u30c0\u30fc\uff09\u30af\u30e9\u30b9\u304c\u3053\u306e\u30d1\u30bf\u30fc\u30f3\u3067\u4f5c\u3089\u308c\u3066\u3044\u307e\u3059\u3002<br>\u3042\u3068\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u4f5c\u6210\u3084\u521d\u671f\u5316\u306b\u6642\u9593\u304c\u304b\u304b\u308b\u3082\u306e\u306b\u3082\u6709\u52b9\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"581\" height=\"246\" src=\"https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/singleton_01.png\" alt=\"\" class=\"wp-image-986\" srcset=\"https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/singleton_01.png 581w, https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/singleton_01-300x127.png 300w\" sizes=\"(max-width: 581px) 100vw, 581px\" \/><\/figure><\/div>\n\n\n\n<p>\u30af\u30e9\u30b9\u56f3\u306b\u3059\u308b\u3068\u3053\u3093\u306a\u611f\u3058\u3067\u3059\u3002<br><\/p>\n\n\n\n<p>\u8d64\u5b57\u3067\u66f8\u3044\u305f\u3068\u304a\u308a\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092private\u3067\u5ba3\u8a00\u3059\u308b\u3053\u3068\u3067\u5916\u90e8\u304b\u3089\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u308c\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3059\u3002<br>Java\u3067\u66f8\u304f\u3068\u3053\u3046\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">[java]\npublic class Singleton {\n    private static Singleton instance = null;\n    private Singleton(){}\n    public static synchronized Singleton getInstance(){\n        if(instance == null){\n            instance = new Singleton();\n        }\n        return instance;\n    }\n}\n[\/java]<\/pre>\n\n\n\n<p>\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u53d6\u5f97\u306fgetInstance()\u95a2\u6570\u3092\u901a\u3057\u3066\u884c\u3044\u307e\u3059\u3002<br>\u3053\u306e\u6642\u3001\u6700\u521d\u306e1\u56de\u306e\u307fnew\u3055\u308c\u3001\u3042\u3068\u306f\u4e00\u5ea6new\u3057\u305f\u3082\u306e\u3092\u4f7f\u3044\u56de\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"561\" height=\"433\" src=\"https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/singleton_02.png\" alt=\"\" class=\"wp-image-987\" srcset=\"https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/singleton_02.png 561w, https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/singleton_02-300x232.png 300w\" sizes=\"(max-width: 561px) 100vw, 561px\" \/><\/figure><\/div>\n\n\n\n<p>\u30cd\u30b3\u3067\u3044\u3046\u306a\u3089\u3053\u3046\u3002<br><\/p>\n\n\n\n<p>\u3068\u3053\u308d\u3067\u4eca\u56de\u3054\u7d39\u4ecb\u3057\u305f\u30bd\u30fc\u30b9\u306f\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u5bfe\u7b56\u3068\u3057\u3066\u3001<br>getInstance()\u95a2\u6570\u306b\u300csynchronized\u300d\u3092\u4ed8\u3051\u3066\u6392\u4ed6\u30ed\u30c3\u30af\u3092\u304b\u3051\u3001<br>\u30b9\u30ec\u30c3\u30c9\u9593\u3067\u30c7\u30fc\u30bf\u306e\u4e0d\u6574\u5408\u304c\u8d77\u304d\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002<br>\u3057\u304b\u3057\u3053\u306e\u5834\u5408\u3001\u4ed6\u306e\u30b9\u30ec\u30c3\u30c9\u3067\u30ed\u30c3\u30af\u304c\u5916\u3055\u308c\u308b\u307e\u3067\u51e6\u7406\u304cwait\u72b6\u614b\u306b\u306a\u308b\u305f\u3081\u3001<br>\u4f8b\u3048\u3070Singleton\u306b\u3057\u305f\u30af\u30e9\u30b9\u3092\u3044\u304f\u3064\u3082\u4f7f\u7528\u3059\u308b\u5834\u5408\u306a\u3069\u306f<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"599\" height=\"343\" src=\"https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/singleton_03.png\" alt=\"\" class=\"wp-image-988\" srcset=\"https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/singleton_03.png 599w, https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2021\/03\/singleton_03-300x172.png 300w\" sizes=\"(max-width: 599px) 100vw, 599px\" \/><\/figure><\/div>\n\n\n\n<p>\u3053\u3093\u306a\u611f\u3058\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<br>\u3053\u308c\u304c\u60aa\u540d\u9ad8\u3044\u30c7\u30c3\u30c9\u30ed\u30c3\u30af\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u3046\u306a\u3089\u306a\u3044\u3088\u3046\u306b\u3001\u51e6\u7406\u306e\u9806\u756a\u306a\u3069\u3092\u5de5\u592b\u3057\u306a\u304c\u3089\u53ef\u611b\u304c\u3063\u3066\u3042\u3052\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<p>\u7b2c2\u56de\u306f\u53cd\u97ff\u3068\u5468\u308a\u306e\u9854\u8272\u6b21\u7b2c\uff01<br>\u30cd\u30b3\u597d\u304dNit\u3067\u3057\u305f\u3002<\/p>\n<div class=\"opent-_2\" style=\"margin-top: 10px;margin-right: 10px;margin-bottom: 10px;margin-left: 10px;\" id=\"opent-1413194238\"><a href=\"https:\/\/www.opentone.co.jp\/backlog\/\" aria-label=\"twitter_backlogskt_new\"><img src=\"https:\/\/www.opentone.co.jp\/ot-lab\/wp-content\/uploads\/sites\/11\/2023\/02\/twitter_backlogskt_new.jpg\" alt=\"\"  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