{"id":96391,"date":"2024-03-21T20:34:28","date_gmt":"2024-03-21T11:34:28","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java-%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b-set-%e3%81%ae%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95\/"},"modified":"2024-03-28T09:31:15","modified_gmt":"2024-03-28T00:31:15","slug":"java-%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b-set-%e3%81%ae%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java-%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b-set-%e3%81%ae%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95\/","title":{"rendered":"Java \u306b\u304a\u3051\u308b Set \u306e\u4f7f\u7528\u65b9\u6cd5"},"content":{"rendered":"

Java\u306eSet\u306fCollection\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u7d99\u627f\u3057\u305f\u96c6\u5408\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3067\u3001HashSet\u3001LinkedHashSet\u3001TreeSet\u306a\u3069\u306e\u5b9f\u88c5\u30af\u30e9\u30b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

Set \u306e\u4e3b\u306a\u7279\u5fb4\u306f\u4ee5\u4e0b\u3067\u3059\u3002<\/p>\n

    \n
  1. \u30bb\u30c3\u30c8\u5185\u306e\u8981\u7d20\u306f\u9806\u5e8f\u3092\u6301\u305f\u305a\u3001\u633f\u5165\u9806\u5e8f\u3069\u304a\u308a\u306b\u4e26\u3093\u3067\u3044\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/li>\n
  2. \u30bb\u30c3\u30c8\u306b\u306f\u91cd\u8907\u3057\u305f\u8981\u7d20\u304c\u542b\u307e\u308c\u305a\u3001\u91cd\u8907\u3057\u305f\u8981\u7d20\u3092\u30bb\u30c3\u30c8\u306b\u8ffd\u52a0\u3057\u3088\u3046\u3068\u3057\u3066\u3082\u3001\u305d\u306e\u64cd\u4f5c\u306f\u7121\u8996\u3055\u308c\u307e\u3059\u3002<\/li>\n
  3. Set \u306b\u306f 1 \u3064\u4ee5\u4e0a\u306e null \u8981\u7d20\u3092\u542b\u3081\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/li>\n<\/ol>\n

    \u5e38\u7528\u3055\u308c\u3066\u3044\u308bSet\u64cd\u4f5c\u306b\u306f\u3001<\/p>\n

      \n
    1. \u8ffd\u52a0\u8981\u7d20\uff1aadd(\u8981\u7d20)\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30bb\u30c3\u30c8\u306b\u8981\u7d20\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/li>\n
    2. \u8981\u7d20\u3092\u524a\u9664\uff1aremove(element)\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066Set\u304b\u3089\u6307\u5b9a\u306e\u8981\u7d20\u3092\u524a\u9664\u3057\u307e\u3059\u3002<\/li>\n
    3. \u8981\u7d20\u3092\u542b\u3080\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\uff1aSet\u306b\u6307\u5b9a\u3057\u305f\u8981\u7d20\u304c\u542b\u307e\u308c\u308b\u304b\u3069\u3046\u304b\u306f\u3001contains(\u8981\u7d20)\u30e1\u30bd\u30c3\u30c9\u3067\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/li>\n
    4. Set\u306e\u30b5\u30a4\u30ba\u306e\u53d6\u5f97\uff1asize()\u30e1\u30bd\u30c3\u30c9\u3067Set\u5185\u306e\u8981\u7d20\u6570\u3092\u53d6\u5f97\u3059\u308b\u3002<\/li>\n
    5. Set\u3092\u53cd\u5fa9\u51e6\u7406\u3059\u308b\uff1aSet\u5185\u306e\u8981\u7d20\u306f\u3001for-each\u30eb\u30fc\u30d7\u307e\u305f\u306f\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u4f7f\u7528\u3057\u3066\u53cd\u5fa9\u51e6\u7406\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ol>\n

      \u4ee5\u4e0b\u306b\u30b3\u30fc\u30c9\u306e\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n

      import<\/span> java.util.HashSet;\r\nimport<\/span> java.util.Set;\r\n\r\npublic<\/span> class<\/span> SetExample<\/span> {\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(String[] args)<\/span> {\r\n        Set<String> set = new<\/span> HashSet<\/span><>();\r\n        \r\n        \/\/ \u6dfb\u52a0\u5143\u7d20<\/span>\r\n        set.add(\"apple\"<\/span>);\r\n        set.add(\"banana\"<\/span>);\r\n        set.add(\"orange\"<\/span>);\r\n        \r\n        \/\/ \u5220\u9664\u5143\u7d20<\/span>\r\n        set.remove(\"banana\"<\/span>);\r\n        \r\n        \/\/ \u5224\u65ad\u662f\u5426\u5305\u542b\u67d0\u4e2a\u5143\u7d20<\/span>\r\n        System.out.println(set.contains(\"apple\"<\/span>)); \/\/ \u8f93\u51fatrue<\/span>\r\n        \r\n        \/\/ \u83b7\u53d6Set\u7684\u5927\u5c0f<\/span>\r\n        System.out.println(set.size()); \/\/ \u8f93\u51fa2<\/span>\r\n        \r\n        \/\/ \u904d\u5386Set<\/span>\r\n        for<\/span> (String element : set) {\r\n            System.out.println(element);\r\n        }\r\n        \/\/ \u8f93\u51fa:<\/span>\r\n        \/\/ apple<\/span>\r\n        \/\/ orange<\/span>\r\n    }\r\n}\r\n<\/code><\/pre>\n
      HashSet\u306fSet\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u306e\u5b9f\u88c5\u30af\u30e9\u30b9\u3067\u3001\u30cf\u30c3\u30b7\u30e5\u8868\u3092\u7528\u3044\u3066\u8981\u7d20\u3092\u683c\u7d0d\u3059\u308b\u305f\u3081\u3001\u633f\u5165\u30fb\u691c\u7d22\u3068\u3044\u3063\u305f\u64cd\u4f5c\u306e\u6642\u9593\u304cO(1)\u3068\u9ad8\u901f\u3067\u3059\u3002\u305f\u3060\u3057\u3001HashSet\u306f\u8981\u7d20\u306e\u9806\u5e8f\u3092\u4fdd\u8a3c\u3057\u307e\u305b\u3093\u3002\u633f\u5165\u9806\u5e8f\u3092\u7dad\u6301\u3057\u305f\u3044\u5834\u5408\u306fLinkedHashSet\u306e\u4f7f\u7528\u3092\u691c\u8a0e\u3057\u307e\u3057\u3087\u3046\u3002\u305d\u308c\u3068\u306f\u5bfe\u7167\u7684\u306bTreeSet\u306f\u8d64\u9ed2\u6728\u306b\u57fa\u3065\u3044\u3066\u5b9f\u88c5\u3055\u308c\u3066\u304a\u308a\u3001\u8981\u7d20\u306e\u9806\u5e8f\u4ed8\u3051\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
      Java\u306eSet\u306fCollection\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u7d99\u627f\u3057\u305f\u96c6\u5408\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3067\u3001HashSet\u3001LinkedHashSet\u3001TreeSet\u306a\u3069\u306e\u5b9f\u88c5\u30af\u30e9\u30b9\u304c\u3042\u308a\u307e\u3059\u3002 Set \u306e\u4e3b\u306a\u7279\u5fb4\u306f\u4ee5\u4e0b\u3067\u3059\u3002 \u30bb\u30c3\u30c8\u5185\u306e\u8981 […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-96391","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nJava \u306b\u304a\u3051\u308b Set \u306e\u4f7f\u7528\u65b9\u6cd5 - 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\/java-\u306b\u304a\u3051\u308b-set-\u306e\u4f7f\u7528\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\u304a\u3051\u308b Set \u306e\u4f7f\u7528\u65b9\u6cd5\" \/>\n<meta property=\"og:description\" content=\"Java\u306eSet\u306fCollection\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u7d99\u627f\u3057\u305f\u96c6\u5408\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3067\u3001HashSet\u3001LinkedHashSet\u3001TreeSet\u306a\u3069\u306e\u5b9f\u88c5\u30af\u30e9\u30b9\u304c\u3042\u308a\u307e\u3059\u3002 Set \u306e\u4e3b\u306a\u7279\u5fb4\u306f\u4ee5\u4e0b\u3067\u3059\u3002 \u30bb\u30c3\u30c8\u5185\u306e\u8981 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/java-\u306b\u304a\u3051\u308b-set-\u306e\u4f7f\u7528\u65b9\u6cd5\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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