{"id":11851,"date":"2024-03-14T14:52:06","date_gmt":"2024-03-14T14:52:06","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-use-custom-annotations-in-java\/"},"modified":"2025-08-04T17:59:39","modified_gmt":"2025-08-04T17:59:39","slug":"how-to-use-custom-annotations-in-java","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-use-custom-annotations-in-java\/","title":{"rendered":"Java Custom Annotations Guide"},"content":{"rendered":"<p>To customize annotations, first use the &#8220;@interface&#8221; keyword to define an annotation, and then simply use the annotation where it is needed.<\/p>\n<p>The example code is shown below:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-comment\">\/\/ \u81ea\u5b9a\u4e49\u6ce8\u89e3<\/span>\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-meta\">@interface<\/span> MyAnnotation {\r\n    String <span class=\"hljs-title function_\">value<\/span><span class=\"hljs-params\">()<\/span>;\r\n}\r\n\r\n<span class=\"hljs-comment\">\/\/ \u4f7f\u7528\u6ce8\u89e3<\/span>\r\n<span class=\"hljs-meta\">@MyAnnotation(value = \"Hello\")<\/span>\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">MyClass<\/span> {\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> {\r\n        <span class=\"hljs-type\">MyClass<\/span> <span class=\"hljs-variable\">myClass<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">MyClass<\/span>();\r\n        <span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u6ce8\u89e3\u7684\u503c<\/span>\r\n        <span class=\"hljs-type\">MyAnnotation<\/span> <span class=\"hljs-variable\">annotation<\/span> <span class=\"hljs-operator\">=<\/span> MyClass.class.getAnnotation(MyAnnotation.class);\r\n        System.out.println(annotation.value()); <span class=\"hljs-comment\">\/\/ \u8f93\u51fa\uff1aHello<\/span>\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>In the example above, a custom annotation named MyAnnotation is first defined. It is then used on the MyClass class with the value attribute set to &#8220;Hello&#8221;. Using reflection in the main method, the value of the MyAnnotation on the MyClass class is obtained and printed.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>To customize annotations, first use the &#8220;@interface&#8221; keyword to define an annotation, and then simply use the annotation where it is needed. The example code is shown below: \/\/ \u81ea\u5b9a\u4e49\u6ce8\u89e3 public @interface MyAnnotation { String value(); } \/\/ \u4f7f\u7528\u6ce8\u89e3 @MyAnnotation(value = &#8220;Hello&#8221;) public class MyClass { public static void main(String[] args) { MyClass myClass = [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[2576,8938,15407,87,180],"class_list":["post-11851","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-annotations","tag-code-tutorial","tag-custom-annotations","tag-java","tag-java-programming"],"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 Custom Annotations Guide - 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