{"id":29459,"date":"2024-03-18T21:04:58","date_gmt":"2024-03-18T12:04:58","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/hashmap%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%87%e3%83%bc%e3%82%bf%e6%90%8d%e5%a4%b1%e5%95%8f%e9%a1%8c%e3%82%92%e8%a7%a3%e6%b1%ba%e3%81%99%e3%82%8b%e6%96%b9\/"},"modified":"2024-03-22T21:02:51","modified_gmt":"2024-03-22T12:02:51","slug":"hashmap%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%87%e3%83%bc%e3%82%bf%e6%90%8d%e5%a4%b1%e5%95%8f%e9%a1%8c%e3%82%92%e8%a7%a3%e6%b1%ba%e3%81%99%e3%82%8b%e6%96%b9","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/hashmap%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%87%e3%83%bc%e3%82%bf%e6%90%8d%e5%a4%b1%e5%95%8f%e9%a1%8c%e3%82%92%e8%a7%a3%e6%b1%ba%e3%81%99%e3%82%8b%e6%96%b9\/","title":{"rendered":"hashmap\u306e\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u30c7\u30fc\u30bf\u640d\u5931\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f"},"content":{"rendered":"

HashMap\u3092\u8907\u6570\u30b9\u30ec\u30c3\u30c9\u3067\u4f7f\u7528\u3059\u308b\u5834\u5408\u3001\u4f55\u3082\u5bfe\u7b56\u3092\u53d6\u3089\u306a\u3044\u3068\u30c7\u30fc\u30bf\u306e\u640d\u5931\u3084\u4e0d\u6574\u5408\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u305d\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u3044\u304f\u3064\u304b\u306e\u65b9\u6cd5\u3067\u3059\uff1a<\/p>\n

    \n
  1. ConcurrentHashMap\u306e\u4f7f\u7528\uff1aConcurrentHashMap\u306f\u3001HashMap\u306e\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306a\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u3042\u308a\u3001\u30bb\u30b0\u30e1\u30f3\u30c8\u30ed\u30c3\u30af\u306e\u4ed5\u7d44\u307f\u306b\u3088\u3063\u3066\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u3092\u4fdd\u8a3c\u3057\u3066\u3044\u307e\u3059\u3002\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u3067\u306f\u3001HashMap\u306e\u4ee3\u308f\u308a\u306bConcurrentHashMap\u306e\u4f7f\u7528\u3092\u63a8\u5968\u3057\u307e\u3059\u3002<\/li>\n
  2. Collections.synchronizedMap()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001HashMap\u3092\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306aMap\u306b\u5909\u63db\u3067\u304d\u307e\u3059\u3002\u4f7f\u7528\u65b9\u6cd5\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/li>\n
  3. Map<String, Object> syncMap = new HashMap<>().synchronizedMap();<\/li>\n
  4. \u3053\u306e\u65b9\u6cd5\u3067\u8fd4\u3055\u308c\u308bMap\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3001\u64cd\u4f5c\u3059\u308b\u969b\u306b\u81ea\u52d5\u7684\u306b\u30ed\u30c3\u30af\u304c\u304b\u3051\u3089\u308c\u3066\u304a\u308a\u3001\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u304c\u78ba\u4fdd\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/li>\n
  5. HashMap\u3078\u306e\u30a2\u30af\u30bb\u30b9\u6642\u306b\u306f\u3001\u660e\u793a\u7684\u306a\u30ed\u30c3\u30af\u30e1\u30ab\u30cb\u30ba\u30e0\u3092\u4f7f\u7528\u3057\u3066\u540c\u671f\u3092\u53d6\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002synchronized\u30ad\u30fc\u30ef\u30fc\u30c9\u3084ReentrantLock\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002HashMap\u3078\u306e\u30a2\u30af\u30bb\u30b9\u306e\u524d\u306b\u30ed\u30c3\u30af\u3092\u304b\u3051\u3001\u64cd\u4f5c\u304c\u5b8c\u4e86\u3057\u305f\u3089\u30ed\u30c3\u30af\u3092\u89e3\u653e\u3057\u3001\u540c\u6642\u306b1\u3064\u306e\u30b9\u30ec\u30c3\u30c9\u3060\u3051\u304cHashMap\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n

    \u4e0a\u8a18\u306e\u89e3\u6c7a\u7b56\u306f\u3001\u5358\u306bHashMap\u306e\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u6027\u3092\u78ba\u4fdd\u3059\u308b\u305f\u3081\u306e\u3082\u306e\u3067\u3042\u308b\u3053\u3068\u306b\u7559\u610f\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3082\u3057HashMap\u306e\u64cd\u4f5c\u306b\u539f\u5b50\u6027\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001\u66f4\u306b\u539f\u5b50\u30af\u30e9\u30b9\u3084\u4ed6\u306e\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u8003\u616e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

    HashMap\u3092\u8907\u6570\u30b9\u30ec\u30c3\u30c9\u3067\u4f7f\u7528\u3059\u308b\u5834\u5408\u3001\u4f55\u3082\u5bfe\u7b56\u3092\u53d6\u3089\u306a\u3044\u3068\u30c7\u30fc\u30bf\u306e\u640d\u5931\u3084\u4e0d\u6574\u5408\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u305d\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u3044\u304f\u3064\u304b\u306e\u65b9\u6cd5\u3067\u3059\uff1a ConcurrentHashMap\u306e\u4f7f\u7528\uff1aConcurrent […]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-29459","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nhashmap\u306e\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u30c7\u30fc\u30bf\u640d\u5931\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f - 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\/hashmap\u306e\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u30c7\u30fc\u30bf\u640d\u5931\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u65b9\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"hashmap\u306e\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u30c7\u30fc\u30bf\u640d\u5931\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f\" \/>\n<meta property=\"og:description\" content=\"HashMap\u3092\u8907\u6570\u30b9\u30ec\u30c3\u30c9\u3067\u4f7f\u7528\u3059\u308b\u5834\u5408\u3001\u4f55\u3082\u5bfe\u7b56\u3092\u53d6\u3089\u306a\u3044\u3068\u30c7\u30fc\u30bf\u306e\u640d\u5931\u3084\u4e0d\u6574\u5408\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u305d\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u3044\u304f\u3064\u304b\u306e\u65b9\u6cd5\u3067\u3059\uff1a ConcurrentHashMap\u306e\u4f7f\u7528\uff1aConcurrent […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/hashmap\u306e\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u30c7\u30fc\u30bf\u640d\u5931\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u65b9\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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