{"id":1100,"date":"2024-08-19T14:30:25","date_gmt":"2024-08-19T05:30:25","guid":{"rendered":"https:\/\/route-zero.com\/recruit\/route\/1100\/"},"modified":"2025-03-24T09:45:11","modified_gmt":"2025-03-24T00:45:11","slug":"1100","status":"publish","type":"route","link":"https:\/\/route-zero.com\/recruit\/route\/1100\/","title":{"rendered":"\u3010Spring Boot\u5b9f\u8df5\u30ac\u30a4\u30c9\u3011List\u578b\u30fbMap\u578b\u306e\u9055\u3044\u3068Bean\u30af\u30e9\u30b9\u306e\u57fa\u790e\uff06\u5fdc\u7528"},"content":{"rendered":"
\n

Spring Boot\u3092\u4f7f\u3063\u305f\u958b\u767a\u3067\u983b\u7e41\u306b\u767b\u5834\u3059\u308b\u300cList\u578b\u300d\u3068\u300cMap\u578b\u300d\u306e\u9055\u3044\u306b\u3064\u3044\u3066\u7406\u89e3\u3059\u308b\u3053\u3068\u306f\u3001\u52b9\u7387\u7684\u306a\u30c7\u30fc\u30bf\u7ba1\u7406\u3084\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u6700\u9069\u5316\u306b\u7e4b\u304c\u308a\u307e\u3059\u3002\u3055\u3089\u306b\u3001Spring Boot\u3067\u5229\u7528\u3055\u308c\u308bBean\u30af\u30e9\u30b9<\/strong>\u306f\u3001\u3053\u308c\u3089\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3068\u5bc6\u63a5\u306b\u95a2\u308f\u3063\u3066\u304a\u308a\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u8a2d\u8a08\u306b\u304a\u3044\u3066\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002<\/p>\n

\u672c\u8a18\u4e8b\u3067\u306f\u3001List\u578b<\/strong>\u3068Map\u578b<\/strong>\u306e\u9055\u3044\u3092\u65e5\u5e38\u751f\u6d3b\u306e\u4f8b\u3092\u4f7f\u3063\u3066\u8aac\u660e\u3057\u3001\u3055\u3089\u306bList<Bean>\u306e\u4f7f\u3044\u65b9\u3092\u542b\u3081\u305f\u5b9f\u8df5\u7684\u306a\u89e3\u8aac\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n

\n

1. List\u578b\u3068Map\u578b\u306e\u9055\u3044<\/h3>\n

1.1 List\u578b\u306e\u4f8b\uff1a\u8cb7\u3044\u7269\u30ea\u30b9\u30c8<\/strong><\/p>\n

List\u578b<\/strong>\u306f\u3001\u9806\u5e8f<\/strong>\u3092\u4fdd\u6301\u3059\u308b\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3067\u3001\u540c\u3058\u8981\u7d20\u3092\u8907\u6570\u56de\u683c\u7d0d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u3092\u65e5\u5e38\u751f\u6d3b\u306e\u4f8b\u3067\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n

\u305f\u3068\u3048\u3070\u3001\u3042\u306a\u305f\u304c\u8cb7\u3044\u7269\u306b\u884c\u304f\u3068\u304d\u3001\u8cb7\u3046\u3082\u306e\u3092\u30e1\u30e2\u306b\u66f8\u304d\u51fa\u3057\u307e\u3059\u3002\u305d\u306e\u30ea\u30b9\u30c8\u306b\u306f\u3001\u540c\u3058\u5546\u54c1\u3092\u8907\u6570\u56de\u66f8\u304f\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u300c\u725b\u4e73\u300d\u3068\u300c\u5375\u300d\u3092\u8cb7\u304a\u3046\u3068\u601d\u3063\u305f\u3051\u3069\u3001\u725b\u4e73\u304c\u8db3\u308a\u306a\u304b\u3063\u305f\u306e\u3067\u3001\u518d\u5ea6\u300c\u725b\u4e73\u300d\u3092\u30ea\u30b9\u30c8\u306b\u52a0\u3048\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u3053\u3053\u3067\u91cd\u8981\u306a\u306e\u306f\u3001\u9806\u756a<\/strong>\u304c\u4fdd\u305f\u308c\u3066\u3044\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n

    \n
  • \n

    List\u578b\u306e\u7279\u5fb4<\/strong>:<\/p>\n

      \n
    • \n

      \u9806\u5e8f\u304c\u4fdd\u8a3c\u3055\u308c\u308b\uff08\u30a2\u30a4\u30c6\u30e0\u3092\u8ffd\u52a0\u3057\u305f\u9806\u756a\u3067\u683c\u7d0d\u3055\u308c\u308b\uff09<\/p>\n<\/li>\n

    • \n

      \u91cd\u8907\u3092\u8a31\u53ef<\/p>\n<\/li>\n

    • \n

      \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\uff08\u4f4d\u7f6e\uff09\u3067\u30a2\u30af\u30bb\u30b9\u53ef\u80fd<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

      List<String> shoppingList = new<\/span> ArrayList<>();\r\nshoppingList.add<\/span>(\"Milk\"<\/span>);\r\nshoppingList.add<\/span>(\"Eggs\"<\/span>);\r\nshoppingList.add<\/span>(\"Milk\"<\/span>); \/\/ \u540c\u3058\u30a2\u30a4\u30c6\u30e0\u3092\u518d\u5ea6\u8ffd\u52a0\u3067\u304d\u308b<\/span><\/code><\/pre>\n
      1.2 Map\u578b\u306e\u4f8b\uff1a\u9023\u7d61\u5148\u30ea\u30b9\u30c8<\/strong><\/p>\n
      \u6b21\u306b\u3001\u96fb\u8a71\u5e33\u3092\u8003\u3048\u307e\u3059\u3002\u96fb\u8a71\u5e33\u3067\u306f\u3001\u540d\u524d<\/strong>\u3068\u96fb\u8a71\u756a\u53f7<\/strong>\u304c\u30bb\u30c3\u30c8\u3067\u767b\u9332\u3055\u308c\u3001\u540c\u3058\u540d\u524d\u3092\u6301\u3064\u4eba\u7269\u306f\u57fa\u672c\u7684\u306b\u4e00\u4eba\u3060\u3051\u3067\u3059\u3002\u3082\u3057\u540c\u3058\u540d\u524d\u306e\u4eba\u304c\u3044\u305f\u3068\u3057\u3066\u3082\u3001\u305d\u308c\u305e\u308c\u5225\u3005\u306e\u96fb\u8a71\u756a\u53f7\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306b\u3001\u540d\u524d\uff08\u30ad\u30fc\uff09\u3068\u305d\u308c\u306b\u95a2\u9023\u3059\u308b<\/strong>\u96fb\u8a71\u756a\u53f7\uff08\u5024\uff09\u3092\u7ba1\u7406\u3059\u308b\u306e\u304cMap\u578b\u3067\u3059\u3002<\/p>\n
        \n
      • \n
        Map\u578b\u306e\u7279\u5fb4<\/strong>:<\/p>\n
          \n
        • \n
          \u30ad\u30fc\u304c\u4e00\u610f\u3067\u3042\u308b\uff08\u91cd\u8907\u3059\u308b\u30ad\u30fc\u306f\u683c\u7d0d\u3067\u304d\u306a\u3044\uff09<\/p>\n<\/li>\n
        • \n
          \u30ad\u30fc\u3067\u5024\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
          Map<\/span><String<\/span>, String<\/span>> phoneBook = new<\/span> HashMap<>();\r\nphoneBook.put(\"John\"<\/span>, \"123-456-7890\"<\/span>);\r\nphoneBook.put(\"Jane\"<\/span>, \"987-654-3210\"<\/span>);<\/code><\/pre>\n
          1.3 List\u578b\u3068Map\u578b\u306e\u4f7f\u3044\u5206\u3051<\/strong><\/p>\n
            \n
          • \n
            List\u578b<\/strong>\u3092\u4f7f\u7528\u3059\u308b\u5834\u9762\u306f\u3001\u9806\u756a\u3092\u91cd\u8996\u3057\u305f\u3044\u5834\u5408\u3084\u3001\u540c\u3058\u30c7\u30fc\u30bf\u3092\u4f55\u5ea6\u3067\u3082\u683c\u7d0d\u3057\u305f\u3044\u5834\u5408\u3067\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u6620\u753b\u306e\u89b3\u8cde\u5c65\u6b74\u3084\u6ce8\u6587\u3057\u305f\u5546\u54c1\u30ea\u30b9\u30c8\u306a\u3069\u3067\u3059\u3002<\/p>\n<\/li>\n
          • \n
            Map\u578b<\/strong>\u3092\u4f7f\u7528\u3059\u308b\u5834\u9762\u306f\u3001\u30ad\u30fc\u3092\u4f7f\u3063\u3066\u30c7\u30fc\u30bf\u3092\u4e00\u610f\u306b\u8b58\u5225\u3057\u305f\u3044\u5834\u5408\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001\u30e6\u30fc\u30b6\u30fcID\u3068\u305d\u306e\u8a73\u7d30\u60c5\u5831\u3092\u7ba1\u7406\u3059\u308b\u5834\u5408\u3084\u3001\u5546\u54c1\u30b3\u30fc\u30c9\u3068\u5546\u54c1\u540d\u3092\u683c\u7d0d\u3059\u308b\u5834\u5408\u3067\u3059\u3002<\/p>\n<\/li>\n<\/ul>\n
            \n
            2. Bean\u30af\u30e9\u30b9\u3068\u306f\uff1f<\/h3>\n
            Spring Boot\u3067\u306f\u3001Bean\u30af\u30e9\u30b9<\/strong>\u304c\u30c7\u30fc\u30bf\u3084\u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u3092\u7ba1\u7406\u3059\u308b\u305f\u3081\u306e\u4e2d\u5fc3\u7684\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002Bean\u30af\u30e9\u30b9\u306f\u3001\u30c7\u30fc\u30bf\u3092\u4fdd\u6301\u3059\u308b\u305f\u3081\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u3057\u3066\u3001\u7279\u306bSpring\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306b\u304a\u3044\u3066\u306f\u3001\u4f9d\u5b58\u6027\u6ce8\u5165\uff08DI\uff09\u3092\u901a\u3058\u3066\u7ba1\u7406\u3055\u308c\u307e\u3059\u3002<\/p>\n
            2.1 Bean\u30af\u30e9\u30b9\u306e\u5f79\u5272<\/strong><\/p>\n
            Bean\u30af\u30e9\u30b9<\/strong>\u306f\u3001\u7279\u5b9a\u306e\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3059\u308b\u305f\u3081\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002Spring\u306f\u3001\u3053\u308c\u3089\u306eBean\u3092\u7ba1\u7406\u3057\u3001\u5fc5\u8981\u306a\u6642\u306b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u60c5\u5831\u3092\u683c\u7d0d\u3059\u308bUserBean\u30af\u30e9\u30b9\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
            public<\/span> class<\/span> UserBean {\r\n    private<\/span> String<\/span> name;\r\n    private<\/span> String<\/span> email;\r\n\r\n    \/\/ \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf<\/span>\r\n    public<\/span> UserBean(String<\/span> name, String<\/span> email) {\r\n        this<\/span>.name = name;\r\n        this<\/span>.email = email;\r\n    }\r\n\r\n    \/\/ \u30b2\u30c3\u30bf\u30fc\u3068\u30bb\u30c3\u30bf\u30fc<\/span>\r\n    public<\/span> String<\/span> getName() {\r\n        return<\/span> name;\r\n    }\r\n\r\n    public<\/span> void<\/span> setName(String<\/span> name) {\r\n        this<\/span>.name = name;\r\n    }\r\n\r\n    public<\/span> String<\/span> getEmail() {\r\n        return<\/span> email;\r\n    }\r\n\r\n    public<\/span> void<\/span> setEmail(String<\/span> email) {\r\n        this<\/span>.email = email;\r\n    }\r\n}<\/code><\/pre>\n
            \u3053\u306eUserBean\u30af\u30e9\u30b9\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5185\u3067\u30e6\u30fc\u30b6\u30fc\u60c5\u5831\u3092\u4fdd\u6301\u3057\u305f\u308a\u3001\u64cd\u4f5c\u3057\u305f\u308a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
            2.2 Spring\u306b\u304a\u3051\u308bBean\u30af\u30e9\u30b9<\/strong><\/p>\n
            Spring\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067\u306f\u3001Bean\u30af\u30e9\u30b9\u306fDI\uff08\u4f9d\u5b58\u6027\u6ce8\u5165\uff09\u306b\u3088\u3063\u3066\u7ba1\u7406\u3055\u308c\u307e\u3059\u3002Bean\u30af\u30e9\u30b9\u306f\u3001\u30b3\u30f3\u30c6\u30ca\u306b\u3088\u3063\u3066\u7ba1\u7406\u3055\u308c\u3001\u305d\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u5fc5\u8981\u306a\u5834\u6240\u306b\u63d0\u4f9b\u3055\u308c\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001UserService\u30af\u30e9\u30b9\u5185\u3067UserBean\u3092\u4f7f\u3046\u5834\u5408\u3001\u6b21\u306e\u3088\u3046\u306b\u66f8\u304d\u307e\u3059\u3002<\/p>\n
            @Service<\/span>\r\npublic<\/span> class<\/span> UserService<\/span> <\/span>{\r\n    @Autowired<\/span>\r\n    private<\/span> UserBean userBean;\r\n\r\n    public<\/span> void<\/span> printUserDetails<\/span>()<\/span> <\/span>{\r\n        System.out.println(\"User: \"<\/span> + userBean.getName() + \", Email: \"<\/span> + userBean.getEmail());\r\n    }\r\n}<\/code><\/pre>\n
            \u3053\u3053\u3067\u306f\u3001UserBean\u304cUserService\u306b\u6ce8\u5165\u3055\u308c\u3001UserService\u5185\u3067UserBean\u306e\u30c7\u30fc\u30bf\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
            \n
            3. List<Bean>\u306e\u4f7f\u3044\u65b9<\/h3>\n
            \u6b21\u306b\u3001List<Bean>\u306e\u5f62\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002List<Bean>\u306f\u3001\u8907\u6570\u306eBean\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u683c\u7d0d\u3059\u308b\u305f\u3081\u306e\u30ea\u30b9\u30c8\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u4f8b\u3048\u3070\u3001\u8907\u6570\u306e\u30e6\u30fc\u30b6\u30fc\u60c5\u5831\u3092\u4e00\u3064\u306e\u30ea\u30b9\u30c8\u3068\u3057\u3066\u7ba1\u7406\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
            3.1 List<UserBean>\u306e\u4f7f\u7528\u4f8b<\/strong><\/p>\n
            UserBean\u30af\u30e9\u30b9\u3092\u4f7f\u3063\u3066\u3001\u8907\u6570\u306e\u30e6\u30fc\u30b6\u30fc\u60c5\u5831\u3092List<UserBean>\u3068\u3057\u3066\u7ba1\u7406\u3059\u308b\u5834\u5408\u3001\u6b21\u306e\u3088\u3046\u306b\u66f8\u304d\u307e\u3059\u3002<\/p>\n
            import java.util.ArrayList;\r\nimport java.util.List;\r\n\r\npublic<\/span> class<\/span> UserService<\/span> {\r\n    public<\/span> void<\/span> createUserList<\/span>(<\/span>)<\/span> {\r\n        \/\/ List<UserBean>\u3092\u4f5c\u6210<\/span>\r\n        List<UserBean> userList = new<\/span> ArrayList<>();\r\n\r\n        \/\/ UserBean\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u3066\u30ea\u30b9\u30c8\u306b\u8ffd\u52a0<\/span>\r\n        userList.add<\/span>(new<\/span> UserBean(\"John Doe\"<\/span>, \"john.doe@example.com\"<\/span>));\r\n        userList.add<\/span>(new<\/span> UserBean(\"Jane Smith\"<\/span>, \"jane.smith@example.com\"<\/span>));\r\n\r\n        \/\/ \u30ea\u30b9\u30c8\u306e\u5185\u5bb9\u3092\u51fa\u529b<\/span>\r\n        for<\/span> (UserBean user : userList) {\r\n            System.out<\/span>.println(\"User: \"<\/span> + user.getName() + \", Email: \"<\/span> + user.getEmail());\r\n        }\r\n    }\r\n}<\/code><\/pre>\n
            \u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001List<UserBean>\u306b\u30e6\u30fc\u30b6\u30fc\u60c5\u5831\u3092\u8ffd\u52a0\u3057\u3001\u30ea\u30b9\u30c8\u5185\u306e\u5168\u30e6\u30fc\u30b6\u30fc\u60c5\u5831\u3092\u51fa\u529b\u3057\u3066\u3044\u307e\u3059\u3002List\u306f\u9806\u5e8f\u3092\u4fdd\u6301\u3059\u308b\u305f\u3081\u3001\u8ffd\u52a0\u3057\u305f\u9806\u756a\u901a\u308a\u306b\u30c7\u30fc\u30bf\u304c\u683c\u7d0d\u3055\u308c\u3001\u53d6\u308a\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
            3.2 List<Bean>\u306e\u4f7f\u7528\u5834\u9762<\/strong><\/p>\n