{"id":19172,"date":"2017-03-07T20:17:36","date_gmt":"2017-03-07T11:17:36","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=19172"},"modified":"2024-05-06T11:40:45","modified_gmt":"2024-05-06T02:40:45","slug":"%e3%80%905%e5%88%86%e3%81%a7java%e5%85%a5%e9%96%80%e3%80%91map%e3%81%aecontainskey%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%a8%e9%80%9f%e5%ba%a6%e3%81%be%e3%81%a8%e3%82%81","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/19172","title":{"rendered":"\u30105\u5206\u3067Java\u5165\u9580\u3011Map\u306econtainsKey\u306e\u4f7f\u3044\u65b9\u3068\u901f\u5ea6\u307e\u3068\u3081"},"content":{"rendered":"

Map\u3067\u4f7f\u7528\u3059\u308bcontainsKey\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u3054\u5b58\u77e5\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n

containsKey\u3063\u3066\u3044\u3063\u305f\u3044\u4f55\uff1f
\ncontainsKey\u306f\u3069\u3046\u3084\u3063\u3066\u4f7f\u3046\u306e\uff1f
\nHashMap.containsKey\u3068TreeMap.containsKey\u306e\u901f\u5ea6\u306e\u9055\u3044\u306f\uff1f<\/div><\/p>\n

\u4eca\u56de\u306f\u305d\u3093\u306a\u60a9\u307f\u3092\u89e3\u6c7a\u3059\u308b\u305f\u3081\u306b\u3001containsKey\u306e\u4f7f\u3044\u65b9\u3092\u3001\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u307e\u3059\uff01<\/p>\n

\u306a\u304a\u3001Java\u306e\u8a18\u4e8b\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u3061\u3089<\/a>\u306b\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u3002<\/p>\n

containsKey\u3068\u306f<\/h2>\n

containsKey\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6307\u5b9a\u3057\u305f\u30ad\u30fc\u304c\u5b58\u5728\u3059\u308b\u304b\u78ba\u8a8d<\/b>\u3092\u884c\u3044\u3001\u30ad\u30fc\u304c\u5b58\u5728\u3059\u308b\u5834\u5408\u306ftrue\u3092\u8fd4\u3057\u307e\u3059\u3002containsKey\u306e\u4f7f\u3044\u65b9\u306f\u4ee5\u4e0b\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n

Map.containsKey(\u691c\u7d22\u3059\u308b\u30ad\u30fc)<\/pre>\n
\u4ee5\u4e0b\u306bcontainsKey\u3092\u4f7f\u7528\u3057\u305f\u3001Map\u306e\u30ad\u30fc\u3092\u691c\u7d22\u3059\u308b\u51e6\u7406\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n
import java.util.*;\r\n\r\npublic class Main {\r\n    public static void main(String[] args) throws Exception {\r\n        \r\n        \/\/Map\u3092\u5ba3\u8a00\u3059\u308b\r\n        Map<Integer, String> map = new HashMap<Integer, String>();\r\n        \r\n        \/\/Map\u306b\u5024\u3092\u8ffd\u52a0\u3059\u308b\r\n        map.put(1, \"apple\");\r\n        map.put(2, \"orange\");\r\n        map.put(3, \"melon\");\r\n\r\n        \/\/\u30ad\u30fc\u304c\u5b58\u5728\u3059\u308b\u304b\u78ba\u8a8d\r\n        if (map.containsKey(2))\r\n        {\r\n            System.out.println(\"oraqnge\");\r\n        }\r\n    }\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c<\/p>\n
orange<\/pre>\n
\u30b5\u30f3\u30d7\u30eb\u3067\u306fMap\u30af\u30e9\u30b9\u3092\u5ba3\u8a00\u3057\u3001\u5909\u6570map\u306b\u5024\u3092\u8ffd\u52a0\u3057\u3066\u3044\u307e\u3059\u3002if\u6587\u3067\u5909\u6570map\u306b\u5bfe\u3057\u3066containsKey\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3001\u30ad\u30fc\u3092\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u6307\u5b9a\u3057\u305f\u30ad\u30fc\u304c\u5b58\u5728\u3059\u308b\u3068\u3001containsKey\u306ftrue\u3092\u8fd4\u3057\u307e\u3059<\/b>\u3002<\/p>\n
\u901f\u5ea6\u9762<\/h2>\n
Map\u306e\u30ad\u30fc\u3092\u691c\u7d22\u3059\u308b\u306e\u306b\u4fbf\u5229\u306acontainsKey\u3067\u3059\u304c\u3001\u901f\u5ea6\u9762\u3067\u306f\u3069\u3046\u306a\u306e\u3067\u3057\u3087\u3046\u304b\uff1f\u5b9f\u969b\u306b\u691c\u8a3c\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002HashMap\u3068TreeMap\u306f\u3001\u3069\u3061\u3089\u304ccontainsKey\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u306e\u691c\u7d22\u51e6\u7406\u304c\u65e9\u3044\u304b\uff1f\u30ca\u30ce\u79d2\u5358\u4f4d\u3067\u6bd4\u8f03\u3057\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n
import java.util.*;\r\n\r\npublic class Main {\r\n    public static void main(String[] args) throws Exception {\r\n        \r\n        \/\/HashMap\u3092\u5ba3\u8a00\u3059\u308b\r\n        Map<Integer, String> hashmap = new HashMap<Integer, String>();\r\n        \r\n        \/\/TreeMap\u3092\u5ba3\u8a00\u3059\u308b\r\n        Map<Integer, String> treemap = new TreeMap<Integer, String>();\r\n        \r\n        \/\/Map\u3092\u8ffd\u52a0\u3059\u308b\r\n        for (int i=0; i<=100000; i++)\r\n        {\r\n            hashmap.put(i, \"apple\");\r\n            treemap.put(i, \"apple\");\r\n        }\r\n        \r\n        \/\/ HashMap\u691c\u7d22\u51e6\u7406\u958b\u59cb\r\n        long start1 = System.nanoTime();\r\n        \r\n        \/\/HashMap\u306bcontainsKey\u3092\u4f7f\u7528\r\n        if (hashmap.containsKey(99999))\r\n        {\r\n            \/\/ \u51e6\u7406\u7d42\u4e86\u6642\u9593\r\n            long end1 = System.nanoTime();\r\n            System.out.println(\"HashMap\uff1a\" + (end1 - start1) \/ 1000000f + \"ms\");\r\n        }\r\n        \r\n        \/\/ TreeMap\u691c\u7d22\u51e6\u7406\u958b\u59cb\r\n        long start2 = System.nanoTime();\r\n        \r\n        \/\/TreeMap\u306bcontainsKey\u3092\u4f7f\u7528\r\n        if (treemap.containsKey(99999))\r\n        {\r\n            \/\/ \u51e6\u7406\u7d42\u4e86\u6642\u9593\r\n            long end2 = System.nanoTime();\r\n            System.out.println(\"TreeMap\uff1a\" + (end2 - start2) \/ 1000000f + \"ms\");\r\n        }\r\n    }\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c<\/p>\n
HashMap\uff1a0.04469ms\r\nTreeMap\uff1a0.084892ms<\/pre>\n
\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u3001HashMap\u3068TreeMap\u3092\u5b9a\u7fa9\u3057\u3066\u3001\u305d\u308c\u305e\u308c10\u4e07\u4ef6\u306e\u30c7\u30fc\u30bf\u3092\u8ffd\u52a0\u3057\u3066\u3044\u307e\u3059\u3002containsKey\u306799999\u306e\u30ad\u30fc\u304c\u5b58\u5728\u3059\u308b\u304b\uff1f\u305d\u308c\u305e\u308c\u691c\u7d22\u3057\u305f\u3068\u3053\u308d\u3001HashMap\u304c\u300c0.04469ms\u300d\u306b\u5bfe\u3057\u3066\u3001TreeMap\u306f\u300c0,084892ms\u300d\u3068\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n
\u7d50\u679c\u3001HashMap\u304cTreeMap\u3088\u308a\u7d042\u500d\u65e9\u3044\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\uff01<\/b><\/p>\n
Map\u306b\u3064\u3044\u3066\u3082\u3063\u3068\u8a73\u3057\u304f\u77e5\u308a\u305f\u3044\u65b9\u3078<\/h2>\n
Map\u306e\u3055\u307e\u3056\u307e\u306a\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u306f\u3001\u4ee5\u4e0b\u306e\u8a18\u4e8b\u306b\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u306d\uff01
\n            \n                
\n                
\n                    
\n                    \n                    <\/div>\n                    
\n                    
\u3010Java\u5165\u9580\u3011Map\u306e\u4f7f\u3044\u65b9\u7dcf\u307e\u3068\u3081(HashMap\u3067\u521d\u671f\u5316\u3001\u5024\u306e\u30bd\u30fc\u30c8)<\/div>\n                    
\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            <\/p>\n
\u307e\u3068\u3081<\/h2>\n
\u3053\u3053\u3067\u306f\u3001containsKey\u306e\u4f7f\u3044\u65b9\u3084containsKey\u3092\u7528\u3044\u3066\u3001HashMap\u3068TreeMap\u306e\u901f\u5ea6\u691c\u8a3c\u3092\u884c\u3044\u307e\u3057\u305f\u3002\u5b9f\u969b\u306e\u696d\u52d9\u3067\u306f\u3001Map\u306b\u6570\u4e07\u301c\u6570\u5341\u4e07\u306e\u8981\u7d20\u304c\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u81a8\u5927\u306a\u30c7\u30fc\u30bf\u306e\u4e2d\u304b\u3089\u76ee\u5f53\u3066\u306e\u30ad\u30fc\u3092\u63a2\u3059\u305f\u3081\u306b\u3001\u30eb\u30fc\u30d7\u3067\u56de\u3057\u30661\u3064\u305a\u3064\u30ad\u30fc\u3092\u691c\u7d22\u3059\u308b\u306e\u306f\u9762\u5012<\/b>\u3067\u3059\u3057\u3001\u30b7\u30b9\u30c6\u30e0\u306e\u8ca0\u8377\u3082\u9ad8\u307e\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/b><\/p>\n
\u305d\u306e\u305f\u3081\u3001Map\u3067\u6307\u5b9a\u3057\u305f\u30ad\u30fc\u304c\u767b\u9332\u3055\u308c\u3066\u3044\u308b\u304b\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306b\u306f\u3001containsKey\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u304c\u6709\u52b9\u3068\u306a\u308a\u307e\u3059\u3002\u3082\u3057\u3001containsKey\u306e\u4f7f\u7528\u65b9\u6cd5\u3092\u5fd8\u308c\u3066\u3057\u307e\u3063\u305f\u3089\u3001\u3053\u306e\u8a18\u4e8b\u3092\u601d\u3044\u51fa\u3057\u3066\u304f\u3060\u3055\u3044\u306d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
Map\u3067\u4f7f\u7528\u3059\u308bcontainsKey\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u3054\u5b58\u77e5\u3067\u3057\u3087\u3046\u304b\uff1f containsKey\u3063\u3066\u3044\u3063\u305f\u3044\u4f55\uff1f containsKey\u306f\u3069\u3046\u3084\u3063\u3066\u4f7f\u3046\u306e\uff1f HashMap.containsKey\u3068TreeMap […]<\/p>\n","protected":false},"author":4,"featured_media":19173,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"swell_btn_cv_data":"","footnotes":""},"categories":[2344],"tags":[67],"class_list":["post-19172","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java-study","tag-java"],"acf":[],"yoast_head":"\n\u30105\u5206\u3067Java\u5165\u9580\u3011Map\u306econtainsKey\u306e\u4f7f\u3044\u65b9\u3068\u901f\u5ea6\u307e\u3068\u3081 | \u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u30d6\u30ed\u30b0<\/title>\n<meta name=\"description\" content=\"\u3053\u306e\u8a18\u4e8b\u3067\u306f\u300c \u30105\u5206\u3067Java\u5165\u9580\u3011Map\u306econtainsKey\u306e\u4f7f\u3044\u65b9\u3068\u901f\u5ea6\u307e\u3068\u3081 \u300d\u306b\u3064\u3044\u3066\u3001\u8ab0\u3067\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3092\u8aad\u3081\u3070\u3001\u3042\u306a\u305f\u306e\u60a9\u307f\u304c\u89e3\u6c7a\u3059\u308b\u3060\u3051\u3058\u3083\u306a\u304f\u3001\u65b0\u305f\u306a\u6c17\u4ed8\u304d\u3082\u767a\u898b\u3067\u304d\u308b\u3053\u3068\u3067\u3057\u3087\u3046\u3002\u304a\u60a9\u307f\u306e\u65b9\u306f\u305c\u3072\u3054\u4e00\u8aad\u304f\u3060\u3055\u3044\u3002\" \/>\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.sejuku.net\/blog\/19172\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u30105\u5206\u3067Java\u5165\u9580\u3011Map\u306econtainsKey\u306e\u4f7f\u3044\u65b9\u3068\u901f\u5ea6\u307e\u3068\u3081 | \u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u30d6\u30ed\u30b0\" \/>\n<meta property=\"og:description\" content=\"\u3053\u306e\u8a18\u4e8b\u3067\u306f\u300c \u30105\u5206\u3067Java\u5165\u9580\u3011Map\u306econtainsKey\u306e\u4f7f\u3044\u65b9\u3068\u901f\u5ea6\u307e\u3068\u3081 \u300d\u306b\u3064\u3044\u3066\u3001\u8ab0\u3067\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3092\u8aad\u3081\u3070\u3001\u3042\u306a\u305f\u306e\u60a9\u307f\u304c\u89e3\u6c7a\u3059\u308b\u3060\u3051\u3058\u3083\u306a\u304f\u3001\u65b0\u305f\u306a\u6c17\u4ed8\u304d\u3082\u767a\u898b\u3067\u304d\u308b\u3053\u3068\u3067\u3057\u3087\u3046\u3002\u304a\u60a9\u307f\u306e\u65b9\u306f\u305c\u3072\u3054\u4e00\u8aad\u304f\u3060\u3055\u3044\u3002\" \/>\n<meta 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\/>\n<meta name=\"twitter:creator\" content=\"@https:\/\/twitter.com\/samuraijuku\" \/>\n<meta name=\"twitter:site\" content=\"@samuraijuku\" \/>\n<script type=\"application\/ld+json\" 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