The Dart Metadata is used to specify the Dart program with additional information. It usually starts with @ symbol, followed by either a reference of the compile-time constant or a call to a constant constructor.<\/p>\n\n\n\n
In Dart, we can define our own metadata annotations.<\/p>\n\n\n\n
Let’s understand the following example –<\/p>\n\n\n\n
Here’s an example of defining a @student annotation that takes two arguments –<\/p>\n\n\n\n
<\/p>\n\n\n\n
<\/a><\/a><\/a><\/p>\n\n\n\n And, here is the following example we are using @student annotation.<\/p>\n\n\n\n <\/p>\n\n\n\n <\/a><\/a><\/a><\/p>\n\n\n\n In Dart, metadata generally define just before a library name, class, typedef, field, type parameter, factory, function, constructor, parameter, or variable declaration and before an import or export directive. We can retrieve the metadata using reflection in runtime.<\/p>\n\n\n\n Let’s understand the following example.<\/p>\n\n\n\n <\/p>\n\n\n\n Output:<\/strong><\/p>\n\n\n\n In the above code, we have provided the addition information to the both parent class and child class functions.<\/p>\n","protected":false},"excerpt":{"rendered":" The Dart Metadata is used to specify the Dart program with additional information. It usually starts with @ symbol, followed by either a reference of the compile-time constant or a call to a constant constructor. Creating Metadata Annotation In Dart, we can define our own metadata annotations. Let’s understand the following example – Example – […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[658],"tags":[],"_links":{"self":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/19819"}],"collection":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/comments?post=19819"}],"version-history":[{"count":0,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/19819\/revisions"}],"wp:attachment":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/media?parent=19819"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/categories?post=19819"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/tags?post=19819"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}library student; \nClass Student { \n final String studentName; \n final String rollno; \n const Student(this.studentName, this.code); \n} <\/code><\/pre>\n\n\n\nimport 'student.dart' ; \n@Student('studentName', 'rollno') \nvoid greetHii() { \n print(\"Hii Welcome to Javatpoint\"); \n} <\/code><\/pre>\n\n\n\nExample –<\/h3>\n\n\n\n
class Human{ \n @Overridden method \n void run() \n { \n print(\"Human is running\"); \n } \n} \nclass Man extends Human{ \n @Overriding method \n void run(){ \n print(\"Boy is running\"); \n } \n} \nvoid main(){ \n Man m = new Man(); \n \/\/This will call the child class version of run() \n m.run(); \n} <\/code><\/pre>\n\n\n\nBoy is running\n<\/code><\/pre>\n\n\n\n