{"id":479,"date":"2023-10-25T07:51:01","date_gmt":"2023-07-22T06:43:25","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java-14%e3%81%ae%e3%83%ac%e3%82%b3%e3%83%bc%e3%83%89%e3%82%af%e3%83%a9%e3%82%b9\/"},"modified":"2025-07-31T23:54:15","modified_gmt":"2025-07-31T14:54:15","slug":"java-14%e3%81%ae%e3%83%ac%e3%82%b3%e3%83%bc%e3%83%89%e3%82%af%e3%83%a9%e3%82%b9","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java-14%e3%81%ae%e3%83%ac%e3%82%b3%e3%83%bc%e3%83%89%e3%82%af%e3%83%a9%e3%82%b9\/","title":{"rendered":"Java 14\u306e\u30ec\u30b3\u30fc\u30c9\u30af\u30e9\u30b9"},"content":{"rendered":"<p>Java 14\u3067\u306f\u3001Records\u3068\u547c\u3070\u308c\u308b\u30af\u30e9\u30b9\u306e\u65b0\u3057\u3044\u4f5c\u6210\u65b9\u6cd5\u304c\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u3053\u3068\u3092\u5b66\u3073\u307e\u3059\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>Why do we need Java Records<\/li>\n<li>How to create Records and use it<\/li>\n<li>Overriding and extending Records classes<\/li>\n<\/ul>\n<p>\u304a\u3059\u3059\u3081\u306e\u8aad\u307f\u7269\uff1aJava 14\u306e\u7279\u5fb4<\/p>\n<h2>\u306a\u305cJava\u306e\u30ec\u30b3\u30fc\u30c9\u304c\u5fc5\u8981\u306a\u306e\u3067\u3057\u3087\u3046\u304b\uff1f (Naze Java no rek\u014ddo ga hitsuy\u014d na nodeshouka?)<\/h2>\n<p>Java\u306b\u95a2\u3059\u308b\u4e00\u822c\u7684\u306a\u4e0d\u6e80\u306e\u4e00\u3064\u306f\u3001\u5197\u9577\u3055\u3067\u3059\u3002\u30b7\u30f3\u30d7\u30eb\u306aPOJO\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3059\u308b\u5834\u5408\u3001\u4ee5\u4e0b\u306e\u30dc\u30a4\u30e9\u30fc\u30d7\u30ec\u30fc\u30c8\u30b3\u30fc\u30c9\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<ul class=\"post-ul\">\n<li>Private fields<\/li>\n<li>Getter and Setter Methods<\/li>\n<li>Constructors<\/li>\n<li>hashCode(), equals(), and toString() methods.<\/li>\n<\/ul>\n<p>\u3053\u306e\u5197\u9577\u3055\u306f\u3001Kotlin\u3068Project Lombok\u3078\u306e\u9ad8\u3044\u95a2\u5fc3\u306e\u4e00\u3064\u306e\u7406\u7531\u3067\u3059\u3002<\/p>\n<p>\u5b9f\u969b\u306b\u3001\u3053\u308c\u3089\u306e\u4e00\u822c\u7684\u306a\u30e1\u30bd\u30c3\u30c9\u3092\u6bce\u56de\u66f8\u304f\u3053\u3068\u306b\u5bfe\u3059\u308b\u6df1\u3044\u6b32\u6c42\u4e0d\u6e80\u306f\u3001Eclipse\u3084IntelliJ IDEA\u306a\u3069\u306eJava IDE\u3067\u305d\u308c\u3089\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306e\u30b7\u30e7\u30fc\u30c8\u30ab\u30c3\u30c8\u306b\u3064\u306a\u304c\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>\u4ee5\u4e0b\u306f\u3001\u30af\u30e9\u30b9\u306e\u30bb\u30ec\u30e2\u30cb\u30a2\u30eb\u306a\u30e1\u30bd\u30c3\u30c9\u3092\u751f\u6210\u3059\u308b\u305f\u3081\u306eEclipse IDE\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u793a\u3059\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8\u3067\u3059\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65648bf0daa94e2bdf7bc383\/9-0.png\" alt=\"Eclipse Shortcuts Generate Ceremonial Methods\" \/><\/div>\n<p>Java Records\u306f\u3001POJO\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306e\u30b3\u30f3\u30d1\u30af\u30c8\u306a\u69cb\u9020\u3092\u63d0\u4f9b\u3059\u308b\u3053\u3068\u3067\u3001\u3053\u306e\u5197\u9577\u3055\u3092\u53d6\u308a\u9664\u304f\u3053\u3068\u3092\u76ee\u7684\u3068\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u300cJava Records \u306e\u4f5c\u308a\u65b9\u306f\u3069\u3046\u3059\u308c\u3070\u3044\u3044\u3067\u3059\u304b\uff1f\u300d<\/h2>\n<p>Java Records\u306f\u3001JEP 359\u306e\u4e0b\u3067\u958b\u767a\u3055\u308c\u305f\u30d7\u30ec\u30d3\u30e5\u30fc\u6a5f\u80fd\u3067\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001Java\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067Records\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306b\u306f2\u3064\u306e\u5fc5\u8981\u306a\u8981\u7d20\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>JDK 14\u304c\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3082\u3057IDE\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001\u305d\u306eIDE\u3082Java 14\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002Eclipse\u3068IntelliJ\u306f\u65e2\u306bJava 14\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\u30d7\u30ec\u30d3\u30e5\u30fc\u30d5\u30a3\u30fc\u30c1\u30e3\u30fc\u306e\u6709\u52b9\u5316: \u30d7\u30ec\u30d3\u30e5\u30fc\u30d5\u30a3\u30fc\u30c1\u30e3\u30fc\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u7121\u52b9\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002Eclipse\u3067\u306f\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306eJava\u30b3\u30f3\u30d1\u30a4\u30e9\u8a2d\u5b9a\u304b\u3089\u6709\u52b9\u306b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/ol>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65648bf0daa94e2bdf7bc383\/14-0.png\" alt=\"Java 14 Enable Preview Feature In Eclipse\" \/><\/div>\n<p>\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u3067\u3001&#8211;enable-preview -source 14 \u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u3001Java 14\u306e\u30d7\u30ec\u30d3\u30e5\u30fc\u6a5f\u80fd\u3092\u6709\u52b9\u306b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u5f93\u696d\u54e1\u306e\u30e2\u30c7\u30eb\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3057\u305f\u3044\u3068\u3057\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u306e\u3088\u3046\u306b\u306a\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>java14<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Map<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Employee<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n\t<span class=\"token keyword\">private<\/span> <span class=\"token keyword\">int<\/span> id<span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token keyword\">private<\/span> <span class=\"token keyword\">long<\/span> salary<span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> addresses<span class=\"token punctuation\">;<\/span>\r\n\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> id<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">long<\/span> salary<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> addresses<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token keyword\">super<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>id <span class=\"token operator\">=<\/span> id<span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">=<\/span> name<span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>salary <span class=\"token operator\">=<\/span> salary<span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>addresses <span class=\"token operator\">=<\/span> addresses<span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token keyword\">return<\/span> id<span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token keyword\">return<\/span> name<span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token function\">getSalary<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token keyword\">return<\/span> salary<span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">getAddresses<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token keyword\">return<\/span> addresses<span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n\t<span class=\"token annotation punctuation\">@Override<\/span>\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">hashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token keyword\">final<\/span> <span class=\"token keyword\">int<\/span> prime <span class=\"token operator\">=<\/span> <span class=\"token number\">31<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token keyword\">int<\/span> result <span class=\"token operator\">=<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\tresult <span class=\"token operator\">=<\/span> prime <span class=\"token operator\">*<\/span> result <span class=\"token operator\">+<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>addresses <span class=\"token operator\">==<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">?<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">:<\/span> addresses<span class=\"token punctuation\">.<\/span><span class=\"token function\">hashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\tresult <span class=\"token operator\">=<\/span> prime <span class=\"token operator\">*<\/span> result <span class=\"token operator\">+<\/span> id<span class=\"token punctuation\">;<\/span>\r\n\t\tresult <span class=\"token operator\">=<\/span> prime <span class=\"token operator\">*<\/span> result <span class=\"token operator\">+<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>name <span class=\"token operator\">==<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">?<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">:<\/span> name<span class=\"token punctuation\">.<\/span><span class=\"token function\">hashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\tresult <span class=\"token operator\">=<\/span> prime <span class=\"token operator\">*<\/span> result <span class=\"token operator\">+<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">(<\/span>salary <span class=\"token operator\">^<\/span> <span class=\"token punctuation\">(<\/span>salary <span class=\"token operator\">&gt;&gt;&gt;<\/span> <span class=\"token number\">32<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token keyword\">return<\/span> result<span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n\t<span class=\"token annotation punctuation\">@Override<\/span>\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Object<\/span> obj<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span> <span class=\"token operator\">==<\/span> obj<span class=\"token punctuation\">)<\/span>\r\n\t\t\t<span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>obj <span class=\"token operator\">==<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span>\r\n\t\t\t<span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">getClass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!=<\/span> obj<span class=\"token punctuation\">.<\/span><span class=\"token function\">getClass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n\t\t\t<span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token class-name\">Employee<\/span> other <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">)<\/span> obj<span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>addresses <span class=\"token operator\">==<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t\t<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>other<span class=\"token punctuation\">.<\/span>addresses <span class=\"token operator\">!=<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span>\r\n\t\t\t\t<span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>addresses<span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>other<span class=\"token punctuation\">.<\/span>addresses<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n\t\t\t<span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>id <span class=\"token operator\">!=<\/span> other<span class=\"token punctuation\">.<\/span>id<span class=\"token punctuation\">)<\/span>\r\n\t\t\t<span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>name <span class=\"token operator\">==<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t\t<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>other<span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">!=<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span>\r\n\t\t\t\t<span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>name<span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>other<span class=\"token punctuation\">.<\/span>name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n\t\t\t<span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>salary <span class=\"token operator\">!=<\/span> other<span class=\"token punctuation\">.<\/span>salary<span class=\"token punctuation\">)<\/span>\r\n\t\t\t<span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n\t<span class=\"token annotation punctuation\">@Override<\/span>\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">toString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token keyword\">return<\/span> <span class=\"token string\">\"Employee [id=\"<\/span> <span class=\"token operator\">+<\/span> id <span class=\"token operator\">+<\/span> <span class=\"token string\">\", name=\"<\/span> <span class=\"token operator\">+<\/span> name <span class=\"token operator\">+<\/span> <span class=\"token string\">\", salary=\"<\/span> <span class=\"token operator\">+<\/span> salary <span class=\"token operator\">+<\/span> <span class=\"token string\">\", addresses=\"<\/span> <span class=\"token operator\">+<\/span> addresses <span class=\"token operator\">+<\/span> <span class=\"token string\">\"]\"<\/span><span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u3075\u3045\u3001\u3053\u308c\u306f\u81ea\u52d5\u751f\u6210\u3055\u308c\u305f\u30b3\u30fc\u30c9\u306e70\u884c\u4ee5\u4e0a\u3067\u3059\u306d\u3002\u3067\u306f\u3001\u540c\u3058\u6a5f\u80fd\u3092\u63d0\u4f9b\u3059\u308b\u5f93\u696d\u54e1\u30ec\u30b3\u30fc\u30c9\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3059\u308b\u65b9\u6cd5\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>java14<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Map<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">record<\/span> <span class=\"token class-name\">EmpRecord<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> id<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">long<\/span> salary<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> addresses<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u308f\u304a\u3001\u3053\u308c\u4ee5\u4e0a\u306f\u77ed\u304f\u306a\u3089\u306a\u3044\u306d\u3002\u3082\u3046\u3001Record\u30af\u30e9\u30b9\u306b\u5922\u4e2d\u3060\u3088\u3002<\/p>\n<p>\u4eca\u3001javap\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001Record\u304c\u30b3\u30f3\u30d1\u30a4\u30eb\u3055\u308c\u308b\u969b\u306b\u88cf\u5074\u3067\u4f55\u304c\u8d77\u3053\u3063\u3066\u3044\u308b\u304b\u3092\u8abf\u3079\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"post-pre\"><code># javac <span class=\"token operator\">--<\/span>enable<span class=\"token operator\">-<\/span>preview <span class=\"token operator\">-<\/span>source <span class=\"token number\">14<\/span> <span class=\"token class-name\">EmpRecord<\/span><span class=\"token punctuation\">.<\/span>java\r\n<span class=\"token class-name\">Note<\/span><span class=\"token operator\">:<\/span> <span class=\"token class-name\">EmpRecord<\/span><span class=\"token punctuation\">.<\/span>java <span class=\"token keyword\">uses<\/span> <span class=\"token namespace\">preview<\/span> language <span class=\"token class-name\"><span class=\"token namespace\">features<span class=\"token punctuation\">.<\/span><\/span>\r\nNote<\/span><span class=\"token operator\">:<\/span> <span class=\"token class-name\">Recompile<\/span> <span class=\"token keyword\">with<\/span> <span class=\"token operator\">-<\/span><span class=\"token class-name\">Xlint<\/span><span class=\"token operator\">:<\/span>preview <span class=\"token keyword\">for<\/span> details<span class=\"token punctuation\">.<\/span>\r\n\r\n# javap <span class=\"token class-name\">EmpRecord<\/span>      \r\n<span class=\"token class-name\">Compiled<\/span> from <span class=\"token string\">\"EmpRecord.java\"<\/span>\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">EmpRecord<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>lang<span class=\"token punctuation\">.<\/span><\/span>Record<\/span> <span class=\"token punctuation\">{<\/span>\r\n  <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">EmpRecord<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>lang<span class=\"token punctuation\">.<\/span><\/span>String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span>Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>lang<span class=\"token punctuation\">.<\/span><\/span>String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>lang<span class=\"token punctuation\">.<\/span><\/span>String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n  <span class=\"token keyword\">public<\/span> <span class=\"token class-name\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>lang<span class=\"token punctuation\">.<\/span><\/span>String<\/span> <span class=\"token function\">toString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n  <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">hashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n  <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>lang<span class=\"token punctuation\">.<\/span><\/span>Object<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n  <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">id<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n  <span class=\"token keyword\">public<\/span> <span class=\"token class-name\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>lang<span class=\"token punctuation\">.<\/span><\/span>String<\/span> <span class=\"token function\">name<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n  <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token function\">salary<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n  <span class=\"token keyword\">public<\/span> <span class=\"token class-name\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span>Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>lang<span class=\"token punctuation\">.<\/span><\/span>String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>lang<span class=\"token punctuation\">.<\/span><\/span>String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">addresses<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n# \r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65648bf0daa94e2bdf7bc383\/23-0.png\" alt=\"Java Record Class Details\" \/><\/div>\n<p>\u3082\u3057\u5185\u90e8\u306e\u8a73\u7d30\u3092\u3082\u3063\u3068\u77e5\u308a\u305f\u3044\u5834\u5408\u306f\u3001javap\u30b3\u30de\u30f3\u30c9\u3092-v\u30aa\u30d7\u30b7\u30e7\u30f3\u4ed8\u304d\u3067\u5b9f\u884c\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token comment\"># javap -v EmpRecord <\/span>\r\n<\/code><\/pre>\n<h2>\u30ec\u30b3\u30fc\u30c9\u30af\u30e9\u30b9\u306b\u95a2\u3059\u308b\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8<\/h2>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u30ec\u30b3\u30fc\u30c9\u30af\u30e9\u30b9\u306ffinal\u306a\u306e\u3067\u3001\u62e1\u5f35\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u30ec\u30b3\u30fc\u30c9\u30af\u30e9\u30b9\u306f\u3001\u6697\u9ed9\u7684\u306bjava.lang.Record\u30af\u30e9\u30b9\u3092\u62e1\u5f35\u3057\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u30ec\u30b3\u30fc\u30c9\u5ba3\u8a00\u3067\u6307\u5b9a\u3055\u308c\u305f\u3059\u3079\u3066\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306ffinal\u3067\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u30ec\u30b3\u30fc\u30c9\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306f\u300c\u6d45\u3044\u300d\u4e0d\u5909\u3067\u3042\u308a\u3001\u578b\u306b\u4f9d\u5b58\u3057\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u30a2\u30c9\u30ec\u30b9\u30d5\u30a3\u30fc\u30eb\u30c9\u306f\u30a2\u30af\u30bb\u30b9\u3057\u3066\u66f4\u65b0\u3059\u308b\u3053\u3068\u3067\u5909\u66f4\u3067\u304d\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u30ec\u30b3\u30fc\u30c9\u5b9a\u7fa9\u3067\u6307\u5b9a\u3055\u308c\u305f\u3059\u3079\u3066\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u6301\u3064\u5358\u4e00\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u4f5c\u6210\u3055\u308c\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u30ec\u30b3\u30fc\u30c9\u30af\u30e9\u30b9\u306f\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u5bfe\u3057\u3066\u81ea\u52d5\u7684\u306b\u30a2\u30af\u30bb\u30b5\u30e1\u30bd\u30c3\u30c9\u3082\u63d0\u4f9b\u3057\u307e\u3059\u3002\u30e1\u30bd\u30c3\u30c9\u540d\u306f\u30d5\u30a3\u30fc\u30eb\u30c9\u540d\u3068\u540c\u3058\u3067\u3042\u308a\u3001\u4e00\u822c\u7684\u306a\u30b2\u30c3\u30bf\u30fc\u30e1\u30bd\u30c3\u30c9\u3068\u306f\u7570\u306a\u308a\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\u30ec\u30b3\u30fc\u30c9\u30af\u30e9\u30b9\u306f\u3001hashCode()\u3001equals()\u3001toString()\u306e\u5b9f\u88c5\u3082\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/ol>\n<h2>Java\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u30ec\u30b3\u30fc\u30c9\u3092\u4f7f\u7528\u3059\u308b<\/h2>\n<p>\u79c1\u305f\u3061\u306eEmpRecord\u30af\u30e9\u30b9\u306e\u4f7f\u7528\u306e\u7c21\u5358\u306a\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>java14<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">RecordTest<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t\r\n\t\t<span class=\"token class-name\">EmpRecord<\/span> empRecord1 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">EmpRecord<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"Pankaj\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token class-name\">EmpRecord<\/span> empRecord2 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">EmpRecord<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"Pankaj\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n\t\t<span class=\"token comment\">\/\/ toString()<\/span>\r\n\t\t<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>empRecord1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token comment\">\/\/ accessing fields<\/span>\r\n\t\t<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"Name: \"<\/span><span class=\"token operator\">+<\/span>empRecord1<span class=\"token punctuation\">.<\/span><span class=\"token function\">name<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> \r\n\t\t<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"ID: \"<\/span><span class=\"token operator\">+<\/span>empRecord1<span class=\"token punctuation\">.<\/span><span class=\"token function\">id<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token comment\">\/\/ equals()<\/span>\r\n\t\t<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>empRecord1<span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>empRecord2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token comment\">\/\/ hashCode()<\/span>\r\n\t\t<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>empRecord1 <span class=\"token operator\">==<\/span> empRecord2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\t\t\r\n\t<span class=\"token punctuation\">}<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u51fa\u529b:<\/p>\n<pre class=\"post-pre\"><code><span class=\"token class-name\">EmpRecord<\/span><span class=\"token punctuation\">[<\/span>id<span class=\"token operator\">=<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> name<span class=\"token operator\">=<\/span><span class=\"token class-name\">Pankaj<\/span><span class=\"token punctuation\">,<\/span> salary<span class=\"token operator\">=<\/span><span class=\"token number\">10000<\/span><span class=\"token punctuation\">,<\/span> addresses<span class=\"token operator\">=<\/span><span class=\"token keyword\">null<\/span><span class=\"token punctuation\">]<\/span>\r\n<span class=\"token class-name\">Name<\/span><span class=\"token operator\">:<\/span> <span class=\"token class-name\">Pankaj<\/span>\r\n<span class=\"token constant\">ID<\/span><span class=\"token operator\">:<\/span> <span class=\"token number\">10<\/span>\r\n<span class=\"token boolean\">true<\/span>\r\n<span class=\"token boolean\">false<\/span>\r\n<\/code><\/pre>\n<p>\u30ec\u30b3\u30fc\u30c9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3001\u30e2\u30c7\u30eb\u30af\u30e9\u30b9\u3084\u30c7\u30fc\u30bf\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306a\u3069\u3068\u540c\u3058\u3088\u3046\u306b\u6a5f\u80fd\u3057\u307e\u3059\u3002<\/p>\n<h2>\u30ec\u30b3\u30fc\u30c9\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u62e1\u5f35\u3059\u308b\u3002<\/h2>\n<p>\u6642\u306b\u306f\u3001\u79c1\u305f\u3061\u306f\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306b\u3044\u304f\u3064\u304b\u306e\u691c\u8a3c\u3084\u30ed\u30b0\u3092\u8ffd\u52a0\u3057\u305f\u3044\u3068\u601d\u3046\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u5f93\u696d\u54e1\u306eID\u3084\u7d66\u4e0e\u306f\u8ca0\u306e\u5024\u3067\u3042\u3063\u3066\u306f\u306a\u308a\u307e\u305b\u3093\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u306f\u3001\u3053\u306e\u691c\u8a3c\u306f\u884c\u308f\u308c\u307e\u305b\u3093\u3002\u30ec\u30b3\u30fc\u30c9\u30af\u30e9\u30b9\u306b\u30b3\u30f3\u30d1\u30af\u30c8\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u30b3\u30fc\u30c9\u306f\u3001\u81ea\u52d5\u751f\u6210\u3055\u308c\u308b\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5148\u982d\u306b\u914d\u7f6e\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">record<\/span> <span class=\"token class-name\">EmpRecord<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> id<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">long<\/span> salary<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> addresses<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token class-name\">EmpRecord<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>id <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span>\r\n\t\t\t<span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">IllegalArgumentException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"employee id can't be negative\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n\t\t<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>salary <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span>\r\n\t\t\t<span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">IllegalArgumentException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"employee salary can't be negative\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u306e\u3088\u3046\u306bEmpRecord\u3092\u4f5c\u6210\u3059\u308b\u5834\u5408<\/p>\n<pre class=\"post-pre\"><code><span class=\"token class-name\">EmpRecord<\/span> empRecord1 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">EmpRecord<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">-<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"Pankaj\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/code><\/pre>\n<p>\u30e9\u30f3\u30bf\u30a4\u30e0\u4f8b\u5916\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token class-name\">Exception<\/span> in thread <span class=\"token string\">\"main\"<\/span> <span class=\"token class-name\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>lang<span class=\"token punctuation\">.<\/span><\/span>IllegalArgumentException<\/span><span class=\"token operator\">:<\/span> employee id can't be negative\r\n\tat <span class=\"token class-name\"><span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>java14<span class=\"token punctuation\">.<\/span><\/span>EmpRecord<\/span><span class=\"token punctuation\">.<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>init<span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">EmpRecord<\/span><span class=\"token punctuation\">.<\/span>java<span class=\"token operator\">:<\/span><span class=\"token number\">9<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<h2>\u30ec\u30b3\u30fc\u30c9\u30af\u30e9\u30b9\u306b\u306f\u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3064\u3053\u3068\u306f\u3067\u304d\u307e\u3059\u304b\uff1f (Rek\u014ddo kurasu ni wa mesoddo o motsu koto wa dekimasu ka?)<\/h2>\n<p>\u306f\u3044\u3001\u79c1\u305f\u3061\u306f\u30ec\u30b3\u30fc\u30c9\u3067\u30e1\u30bd\u30c3\u30c9\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">record<\/span> <span class=\"token class-name\">EmpRecord<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> id<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">long<\/span> salary<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> addresses<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">getAddressCount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>addresses <span class=\"token operator\">!=<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span>\r\n\t\t\t<span class=\"token keyword\">return<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">addresses<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token keyword\">else<\/span>\r\n\t\t\t<span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u305f\u3060\u3057\u3001\u30ec\u30b3\u30fc\u30c9\u306f\u30c7\u30fc\u30bf\u306e\u30ad\u30e3\u30ea\u30a2\u3068\u3057\u3066\u610f\u56f3\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30ec\u30b3\u30fc\u30c9\u30af\u30e9\u30b9\u306b\u306f\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3064\u3079\u304d\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u4f8b\u3048\u3070\u3001\u4e0a\u8a18\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30af\u30e9\u30b9\u3067\u4f5c\u6210\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3082\u3057\u3001\u3042\u306a\u305f\u304cRecord\u30af\u30e9\u30b9\u306b\u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3064\u3053\u3068\u304c\u5fc5\u8981\u3060\u3068\u8003\u3048\u308b\u306a\u3089\u3001\u672c\u5f53\u306bRecord\u30af\u30e9\u30b9\u304c\u5fc5\u8981\u304b\u3088\u304f\u8003\u3048\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h2>\u7d50\u8ad6<\/h2>\n<p>Java\u306e\u30ec\u30b3\u30fc\u30c9\u306f\u3001\u30b3\u30a2\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u6a5f\u80fd\u3078\u306e\u6b53\u8fce\u3059\u3079\u304d\u8ffd\u52a0\u3067\u3059\u3002\u3053\u308c\u306f\u300c\u540d\u524d\u4ed8\u304d\u30bf\u30d7\u30eb\u300d\u3068\u8003\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u7169\u96d1\u306a\u30b3\u30fc\u30c9\u3092\u907f\u3051\u3001\u30b3\u30f3\u30d1\u30af\u30c8\u306a\u69cb\u9020\u306e\u30c7\u30fc\u30bf\u30ad\u30e3\u30ea\u30a2\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306e\u3082\u306e\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java 14\u3067\u306f\u3001Records\u3068\u547c\u3070\u308c\u308b\u30af\u30e9\u30b9\u306e\u65b0\u3057\u3044\u4f5c\u6210\u65b9\u6cd5\u304c\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u3053\u3068\u3092\u5b66\u3073\u307e\u3059\uff1a Why do we need Java Records How to create Re [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-479","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java 14\u306e\u30ec\u30b3\u30fc\u30c9\u30af\u30e9\u30b9 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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