{"id":632,"date":"2023-02-20T03:12:01","date_gmt":"2023-11-11T14:28:42","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java-14-%e7%9a%84-records-%e7%b1%bb\/"},"modified":"2025-08-03T00:03:51","modified_gmt":"2025-08-02T16:03:51","slug":"java-14-%e7%9a%84-records-%e7%b1%bb","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-14-%e7%9a%84-records-%e7%b1%bb\/","title":{"rendered":"Java 14 Records\u7c7b\u8be6\u89e3\uff1a\u7b80\u5316\u6570\u636e\u7c7b\u7684\u65b0\u7279\u6027"},"content":{"rendered":"<p>Java 14\u63a8\u51fa\u4e86\u4e00\u79cd\u79f0\u4e3a&#8221;\u8bb0\u5f55(Records)&#8221;\u7684\u65b0\u65b9\u5f0f\u6765\u521b\u5efa\u7c7b\u3002\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u6211\u4eec\u5c06\u5b66\u4e60\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\u4e3a\u4ec0\u4e48\u6211\u4eec\u9700\u8981Java\u8bb0\u5f55<\/li>\n<li>\u5982\u4f55\u521b\u5efa\u8bb0\u5f55\u5e76\u4f7f\u7528\u5b83<\/li>\n<li>\u91cd\u5199\u548c\u6269\u5c55\u8bb0\u5f55\u7c7b<\/li>\n<\/ul>\n<p>\u63a8\u8350\u9605\u8bfb\uff1aJava 14 \u7279\u6027<\/p>\n<h2>\u4e3a\u4ec0\u4e48\u6211\u4eec\u9700\u8981Java\u8bb0\u5f55\uff1f<\/h2>\n<p>Java\u4e00\u76f4\u4ee5\u6765\u6700\u5e38\u89c1\u7684\u62b1\u6028\u4e4b\u4e00\u5c31\u662f\u5176\u5197\u957f\u6027\u3002\u5982\u679c\u4f60\u9700\u8981\u521b\u5efa\u4e00\u4e2a\u7b80\u5355\u7684POJO\uff08Plain Old Java Object\uff09\u7c7b\uff0c\u5c31\u9700\u8981\u4ee5\u4e0b\u6837\u677f\u4ee3\u7801\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\u79c1\u6709\u5b57\u6bb5<\/li>\n<li>Getter\u548cSetter\u65b9\u6cd5<\/li>\n<li>\u6784\u9020\u51fd\u6570<\/li>\n<li>hashCode()\u3001equals()\u548ctoString()\u65b9\u6cd5<\/li>\n<\/ul>\n<p>\u8fd9\u79cd\u5570\u55e6\u662f\u5bfc\u81f4Kotlin\u548cProject Lombok\u5907\u53d7\u5173\u6ce8\u7684\u539f\u56e0\u4e4b\u4e00\u3002<\/p>\n<p>\u5b9e\u9645\u4e0a\uff0c\u6bcf\u6b21\u90fd\u8981\u7f16\u5199\u8fd9\u4e9b\u901a\u7528\u65b9\u6cd5\u7684\u7eaf\u7cb9\u6cae\u4e27\uff0c\u5bfc\u81f4\u4e86\u5728Java IDE\uff08\u5982Eclipse\u548cIntelliJ IDEA\uff09\u4e2d\u521b\u5efa\u5b83\u4eec\u7684\u5feb\u6377\u65b9\u5f0f\u3002<\/p>\n<p>\u8fd9\u662f\u663e\u793aEclipse IDE\u751f\u6210\u7c7b\u7684\u4eea\u5f0f\u65b9\u6cd5\u9009\u9879\u7684\u5c4f\u5e55\u622a\u56fe\u3002<\/p>\n<div>\n    <img decoding=\"async\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647bd0a4b2f92e6c72c526\/9-0.png\" class='post-images' alt=\"Eclipse Shortcuts Generate Ceremonial Methods\" title=\"\">\n<\/div>\n<p>Java\u8bb0\u5f55\u65e8\u5728\u901a\u8fc7\u63d0\u4f9b\u7d27\u51d1\u7684\u7ed3\u6784\u6765\u521b\u5efaPOJO\u7c7b\uff0c\u4ee5\u6d88\u9664\u8fd9\u79cd\u5197\u957f\u3002<\/p>\n<h2>\u5982\u4f55\u521b\u5efaJava\u8bb0\u5f55<\/h2>\n<p>Java\u8bb0\u5f55\u662f\u4e00\u4e2a\u9884\u89c8\u529f\u80fd\uff0c\u5b83\u662f\u5728JEP 359\u4e0b\u5f00\u53d1\u7684\u3002\u56e0\u6b64\uff0c\u8981\u5728\u4f60\u7684Java\u9879\u76ee\u4e2d\u521b\u5efa\u8bb0\u5f55\uff0c\u4f60\u9700\u8981\u4e24\u4e2a\u4e1c\u897f\uff1a<\/p>\n<ol>\n<li>\u5df2\u5b89\u88c5JDK 14\u3002\u5982\u679c\u60a8\u6b63\u5728\u4f7f\u7528IDE\uff0c\u90a3\u4e48\u5b83\u5fc5\u987b\u4e5f\u652f\u6301Java 14\u3002Eclipse\u548cIntelliJ\u90fd\u5df2\u7ecf\u63d0\u4f9b\u4e86\u5bf9Java 14\u7684\u652f\u6301\uff0c\u6240\u4ee5\u6211\u4eec\u5728\u8fd9\u65b9\u9762\u662f\u6ca1\u6709\u95ee\u9898\u7684\u3002<\/li>\n<li>\u542f\u7528\u9884\u89c8\u529f\u80fd\uff1a\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u9884\u89c8\u529f\u80fd\u662f\u7981\u7528\u7684\u3002\u60a8\u53ef\u4ee5\u5728Eclipse\u4e2d\u901a\u8fc7\u9879\u76eeJava\u7f16\u8bd1\u5668\u8bbe\u7f6e\u8fdb\u884c\u542f\u7528\u3002<\/li>\n<\/ol>\n<div>\n    <img decoding=\"async\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647bd0a4b2f92e6c72c526\/14-0.png\" class='post-images' alt=\"Java 14 Enable Preview Feature In Eclipse\" title=\"\">\n<\/div>\n<p>\u4f60\u53ef\u4ee5\u5728\u547d\u4ee4\u884c\u4e2d\u4f7f\u7528&#8211;enable-preview -source 14\u9009\u9879\u6765\u542f\u7528Java 14\u7684\u9884\u89c8\u529f\u80fd\u3002<\/p>\n<p>\u5047\u8bbe\u6211\u60f3\u521b\u5efa\u4e00\u4e2a\u5458\u5de5\u6a21\u578b\u7c7b\u3002\u5b83\u7684\u4ee3\u7801\u5927\u81f4\u5982\u4e0b\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>\u547c\uff0c\u8fd9\u662f70\u591a\u884c\u7684\u81ea\u52a8\u751f\u6210\u4ee3\u7801\u3002\u73b0\u5728\u8ba9\u6211\u4eec\u770b\u770b\u5982\u4f55\u521b\u5efa\u4e00\u4e2a\u5458\u5de5\u8bb0\u5f55\u7c7b\uff0c\u5b83\u672c\u8d28\u4e0a\u63d0\u4f9b\u4e86\u76f8\u540c\u7684\u529f\u80fd\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>\u54c7\uff0c\u8fd9\u771f\u7684\u65e0\u6cd5\u518d\u77ed\u4e86\u3002\u6211\u5df2\u7ecf\u7231\u4e0a\u4e86Records\u7c7b\u3002<\/p>\n<p>\u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u4f7f\u7528javap\u547d\u4ee4\u6765\u4e86\u89e3\u5728\u7f16\u8bd1\u67d0\u4e2a\u8bb0\u5f55\u65f6\u53d1\u751f\u7684\u80cc\u540e\u60c5\u51b5\u3002<\/p>\n<pre class=\"post-pre\"><code># javac --enable-preview -source 14 EmpRecord.java\r\n\u6ce8\u610f\uff1aEmpRecord.java \u4f7f\u7528\u4e86\u9884\u89c8\u8bed\u8a00\u529f\u80fd\u3002\r\n\u6ce8\u610f\uff1a\u8bf7\u4f7f\u7528 -Xlint:preview \u91cd\u65b0\u7f16\u8bd1\u4ee5\u83b7\u53d6\u8be6\u7ec6\u4fe1\u606f\u3002\r\n\r\n# javap EmpRecord      \r\n\u7f16\u8bd1\u81ea \"EmpRecord.java\"\r\npublic final class EmpRecord extends java.lang.Record {\r\n  public EmpRecord(int, java.lang.String, long, java.util.Map&lt;java.lang.String, java.lang.String&gt;);\r\n  public java.lang.String toString();\r\n  public final int hashCode();\r\n  public final boolean equals(java.lang.Object);\r\n  public int id();\r\n  public java.lang.String name();\r\n  public long salary();\r\n  public java.util.Map&lt;java.lang.String, java.lang.String&gt; addresses();\r\n}\r\n# \r\n<\/code><\/pre>\n<div>\n                            <img decoding=\"async\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647bd0a4b2f92e6c72c526\/23-0.png\" class='post-images' alt=\"Java Record \u7c7b\u8be6\u7ec6\u4fe1\u606f\" title=\"\">\n<\/div>\n<p>\u5982\u679c\u4f60\u60f3\u8981\u66f4\u591a\u7684\u5185\u90e8\u7ec6\u8282\uff0c\u8bf7\u4f7f\u7528javap\u547d\u4ee4\u5e76\u52a0\u4e0a-v\u9009\u9879\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token comment\"># javap -v EmpRecord<\/span>\r\n<\/code><\/pre>\n<h2>\u8bb0\u5f55\u7c7b\u7684\u91cd\u8981\u8981\u70b9<\/h2>\n<p>\u8bb0\u5f55\u7c7b\u7684\u5173\u952e\u8981\u70b9\uff1a<\/p>\n<ol>\n<li>\u4e00\u4e2aRecord\u7c7b\u662ffinal\u7684\uff0c\u6240\u4ee5\u6211\u4eec\u4e0d\u80fd\u6269\u5c55\u5b83\u3002<\/li>\n<li>Record\u7c7b\u9690\u5f0f\u5730\u6269\u5c55\u4e86java.lang.Record\u7c7b\u3002<\/li>\n<li>\u8bb0\u5f55\u58f0\u660e\u4e2d\u6307\u5b9a\u7684\u6240\u6709\u5b57\u6bb5\u90fd\u662ffinal\u7684\u3002<\/li>\n<li>\u8bb0\u5f55\u5b57\u6bb5\u662f&#8221;\u6d45&#8221;\u4e0d\u53ef\u53d8\u7684\uff0c\u5e76\u4e14\u4f9d\u8d56\u4e8e\u7c7b\u578b\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u8bbf\u95ee\u5e76\u66f4\u65b0\u5730\u5740\u5b57\u6bb5\u6765\u66f4\u6539\u5b83\u3002<\/li>\n<li>\u521b\u5efa\u4e00\u4e2a\u5355\u4e00\u7684\u6784\u9020\u51fd\u6570\uff0c\u5176\u4e2d\u5305\u542b\u8bb0\u5f55\u5b9a\u4e49\u4e2d\u6307\u5b9a\u7684\u6240\u6709\u5b57\u6bb5\u3002<\/li>\n<li>Record\u7c7b\u81ea\u52a8\u4e3a\u5b57\u6bb5\u63d0\u4f9b\u8bbf\u95ee\u65b9\u6cd5\u3002\u65b9\u6cd5\u540d\u4e0e\u5b57\u6bb5\u540d\u76f8\u540c\uff0c\u4e0d\u50cf\u901a\u7528\u548c\u5e38\u89c4\u7684getter\u65b9\u6cd5\u3002<\/li>\n<li>Record\u7c7b\u8fd8\u63d0\u4f9b\u4e86hashCode()\u3001equals()\u548ctoString()\u7684\u5b9e\u73b0\u3002<\/li>\n<\/ol>\n<h2>\u5728Java\u7a0b\u5e8f\u4e2d\u4f7f\u7528\u8bb0\u5f55<\/h2>\n<p>\u8ba9\u6211\u4eec\u770b\u4e00\u4e2a\u4f7f\u7528\u6211\u4eec\u7684EmpRecord\u7c7b\u7684\u7b80\u5355\u4f8b\u5b50\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    <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        \r\n        <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        <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        <span class=\"token comment\">\/\/ toString()\u65b9\u6cd5<\/span>\r\n        <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        \r\n        <span class=\"token comment\">\/\/ \u8bbf\u95ee\u5b57\u6bb5<\/span>\r\n        <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\">\"\u59d3\u540d: \"<\/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        <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        \r\n        <span class=\"token comment\">\/\/ equals()\u65b9\u6cd5<\/span>\r\n        <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        \r\n        <span class=\"token comment\">\/\/ hashCode()\u65b9\u6cd5<\/span>\r\n        <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>        \r\n    <span class=\"token punctuation\">}<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\uff1a<\/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>Record\u5bf9\u8c61\u7684\u5de5\u4f5c\u65b9\u5f0f\u4e0e\u4efb\u4f55\u6a21\u578b\u7c7b\u3001\u6570\u636e\u5bf9\u8c61\u7b49\u76f8\u540c\u3002<\/p>\n<h2>\u6269\u5c55\u8bb0\u5f55\u6784\u9020\u51fd\u6570<\/h2>\n<p>\u6709\u65f6\u5019\uff0c\u6211\u4eec\u5e0c\u671b\u5728\u6784\u9020\u51fd\u6570\u4e2d\u8fdb\u884c\u4e00\u4e9b\u9a8c\u8bc1\u6216\u8bb0\u5f55\u3002\u4f8b\u5982\uff0c\u96c7\u5458ID\u548c\u85aa\u6c34\u4e0d\u5e94\u8be5\u4e3a\u8d1f\u503c\u3002\u9ed8\u8ba4\u7684\u6784\u9020\u51fd\u6570\u6ca1\u6709\u8fd9\u4e2a\u9a8c\u8bc1\u3002\u6211\u4eec\u53ef\u4ee5\u5728\u8bb0\u5f55\u7c7b\u4e2d\u521b\u5efa\u4e00\u4e2a\u7b80\u6d01\u7684\u6784\u9020\u51fd\u6570\u3002\u8fd9\u4e2a\u6784\u9020\u51fd\u6570\u7684\u4ee3\u7801\u5c06\u653e\u7f6e\u5728\u81ea\u52a8\u751f\u6210\u7684\u6784\u9020\u51fd\u6570\u7684\u5f00\u5934\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>\u5982\u679c\u6211\u4eec\u6309\u7167\u4ee5\u4e0b\u4ee3\u7801\u521b\u5efa\u4e00\u4e2a EmpRecord\uff1a<\/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>\u6211\u4eec\u5c06\u4f1a\u5f97\u5230\u4e00\u4e2a\u8fd0\u884c\u65f6\u5f02\u5e38\uff1a<\/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>\u8bb0\u5f55\u7c7b\u53ef\u4ee5\u6709\u65b9\u6cd5\u5417\uff1f<\/h2>\n<p>\u662f\u7684\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u8bb0\u5f55\u4e2d\u521b\u5efa\u65b9\u6cd5\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>\u4f46\u662f\uff0c\u8bb0\u5f55\uff08Record\uff09\u7684\u76ee\u7684\u5c31\u662f\u7528\u6765\u627f\u8f7d\u6570\u636e\u7684\u3002\u6211\u4eec\u5e94\u8be5\u907f\u514d\u5728\u8bb0\u5f55\u7c7b\u4e2d\u5305\u542b\u5de5\u5177\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c\u4e0a\u8ff0\u7684\u65b9\u6cd5\u53ef\u4ee5\u5728\u4e00\u4e2a\u5de5\u5177\u7c7b\u4e2d\u521b\u5efa\u3002<\/p>\n<p>\u5982\u679c\u4f60\u8ba4\u4e3a\u5bf9\u4e8e\u4f60\u7684Record\u7c7b\u6765\u8bf4\uff0c\u62e5\u6709\u4e00\u4e2a\u65b9\u6cd5\u662f\u5fc5\u987b\u7684\uff0c\u90a3\u4e48\u8bf7\u4ed4\u7ec6\u601d\u8003\u4e00\u4e0b\uff0c\u4f60\u771f\u7684\u9700\u8981\u4e00\u4e2aRecord\u7c7b\u5417\uff1f<\/p>\n<h2>\u7ed3\u8bba<\/h2>\n<p>Java 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[&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1243,1244,180,1775,1763],"class_list":{"0":"post-632","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-java-14","8":"tag-java","10":"tag-records","11":"tag-1763"},"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 Records\u7c7b\u8be6\u89e3\uff1a\u7b80\u5316\u6570\u636e\u7c7b\u7684\u65b0\u7279\u6027 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u6df1\u5165\u4e86\u89e3Java 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