{"id":74084,"date":"2024-03-20T13:53:45","date_gmt":"2024-03-20T04:53:45","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ab%e3%82%88%e3%82%8b%e3%83%9e%e3%83%83%e3%83%94%e3%83%b3%e3%82%b0%e3%83%aa%e3%83%ac%e3%83%bc%e3%82%b7%e3%83%a7%e3%83%b3%e3%81%ae%e7%a2%ba%e7%ab%8b%e6%96%b9%e6%b3%95\/"},"modified":"2025-08-11T05:43:01","modified_gmt":"2025-08-10T20:43:01","slug":"java%e3%81%ab%e3%82%88%e3%82%8b%e3%83%9e%e3%83%83%e3%83%94%e3%83%b3%e3%82%b0%e3%83%aa%e3%83%ac%e3%83%bc%e3%82%b7%e3%83%a7%e3%83%b3%e3%81%ae%e7%a2%ba%e7%ab%8b%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ab%e3%82%88%e3%82%8b%e3%83%9e%e3%83%83%e3%83%94%e3%83%b3%e3%82%b0%e3%83%aa%e3%83%ac%e3%83%bc%e3%82%b7%e3%83%a7%e3%83%b3%e3%81%ae%e7%a2%ba%e7%ab%8b%e6%96%b9%e6%b3%95\/","title":{"rendered":"Java\u306b\u3088\u308b\u30de\u30c3\u30d4\u30f3\u30b0\u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u78ba\u7acb\u65b9\u6cd5"},"content":{"rendered":"

Java\u3067\u306f\u3001Map\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u306e\u5b9f\u88c5\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u30de\u30c3\u30d4\u30f3\u30b0\u95a2\u4fc2\u3092\u4f5c\u6210\u3067\u304d\u307e\u3059\u3002\u4e00\u822c\u7684\u306aMap\u5b9f\u88c5\u30af\u30e9\u30b9\u306b\u306f\u3001HashMap\u3001TreeMap\u3001LinkedHashMap\u306a\u3069\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u5730\u56f3\u4ed8\u3051\u95a2\u4fc2\u3092\u78ba\u7acb\u3059\u308b\u305f\u3081\u306e\u4ee3\u8868\u7684\u306a\u64cd\u4f5c\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\uff1a<\/p>\n

    \n
  1. \u5730\u56f3<\/li>\n<\/ol>\n
    Map<String, Integer> map = new<\/span> HashMap<\/span><>();\r\n<\/code><\/pre>\n
      \n
    1. \u30de\u30c3\u30d7\u306b\u30ad\u30fc\u30d0\u30ea\u30e5\u30fc\u3092\u8ffd\u52a0\u3059\u308b:<\/li>\n<\/ol>\n
      map.put(\"key1\"<\/span>, 1<\/span>);\r\nmap.put(\"key2\"<\/span>, 2<\/span>);\r\nmap.put(\"key3\"<\/span>, 3<\/span>);\r\n<\/code><\/pre>\n
        \n
      1. \u30de\u30c3\u30d7\u304b\u3089\u5024\u3092\u53d6\u5f97\u3059\u308b\uff1a<\/li>\n<\/ol>\n
        int<\/span> value1<\/span> =<\/span> map.get(\"key1\"<\/span>); \/\/ \u8fd4\u56de1<\/span>\r\n<\/code><\/pre>\n
          \n
        1. \u30de\u30c3\u30d7\u4e2d\u306b\u7279\u5b9a\u306e\u30ad\u30fc\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u78ba\u8a8d<\/li>\n<\/ol>\n
          boolean<\/span> containsKey<\/span> =<\/span> map.containsKey(\"key1\"<\/span>); \/\/ \u8fd4\u56detrue<\/span>\r\n<\/code><\/pre>\n
            \n
          1. \u30de\u30c3\u30d7\u306b\u5024\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b:<\/li>\n<\/ol>\n
            boolean<\/span> containsValue<\/span> =<\/span> map.containsValue(1<\/span>); \/\/ \u8fd4\u56detrue<\/span>\r\n<\/code><\/pre>\n
              \n
            1. \u8f9e\u66f8\u306e\u30ad\u30fc\u3068\u5024\u306e\u30da\u30a2\u3092\u30a4\u30c6\u30ec\u30fc\u30c8\u3059\u308b\uff1a<\/li>\n<\/ol>\n
              for<\/span> (Map.Entry<String, Integer> entry : map.entrySet()) {\r\n    String<\/span> key<\/span> =<\/span> entry.getKey();\r\n    Integer<\/span> value<\/span> =<\/span> entry.getValue();\r\n    System.out.println(key + \" = \"<\/span> + value);\r\n}\r\n<\/code><\/pre>\n
                \n
              1. \u30de\u30c3\u30d7\u304b\u3089\u30ad\u30fc\u3068\u5024\u306e\u30da\u30a2\u3092\u524a\u9664\u3057\u307e\u3059:<\/li>\n<\/ol>\n
                map.remove(\"key1\"<\/span>);\r\n<\/code><\/pre>\n
                Map\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306f\u30ad\u30fc\u3068\u5024\u304cnull\u3092\u8a31\u53ef\u3059\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u305f\u3060\u3057HashMap \u3068TreeMap\u306fnull\u30ad\u30fc\u3092\u30b5\u30dd\u30fc\u30c8\u305b\u305a\u3001LinkedHashMap\u306f\u4f8b\u5916\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
                Java\u3067\u306f\u3001Map\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u306e\u5b9f\u88c5\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u30de\u30c3\u30d4\u30f3\u30b0\u95a2\u4fc2\u3092\u4f5c\u6210\u3067\u304d\u307e\u3059\u3002\u4e00\u822c\u7684\u306aMap\u5b9f\u88c5\u30af\u30e9\u30b9\u306b\u306f\u3001HashMap\u3001TreeMap\u3001LinkedHashMap\u306a\u3069\u304c\u3042\u308a\u307e\u3059\u3002 \u5730\u56f3\u4ed8\u3051\u95a2\u4fc2\u3092\u78ba\u7acb\u3059\u308b\u305f\u3081\u306e […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-74084","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"\nJava\u306b\u3088\u308b\u30de\u30c3\u30d4\u30f3\u30b0\u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u78ba\u7acb\u65b9\u6cd5 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Java\u306b\u3088\u308b\u30de\u30c3\u30d4\u30f3\u30b0\u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u78ba\u7acb\u65b9\u6cd5\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\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.silicloud.com\/ja\/blog\/java\u306b\u3088\u308b\u30de\u30c3\u30d4\u30f3\u30b0\u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u78ba\u7acb\u65b9\u6cd5\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u306b\u3088\u308b\u30de\u30c3\u30d4\u30f3\u30b0\u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u78ba\u7acb\u65b9\u6cd5\" \/>\n<meta property=\"og:description\" content=\"Java\u306b\u3088\u308b\u30de\u30c3\u30d4\u30f3\u30b0\u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u78ba\u7acb\u65b9\u6cd5\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u306b\u3088\u308b\u30de\u30c3\u30d4\u30f3\u30b0\u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u78ba\u7acb\u65b9\u6cd5\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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