El método getDeclaredAnnotations() de la clase java.lang.Class se utiliza para obtener las anotaciones declaradas presentes en esta clase. El método devuelve una array de anotaciones declaradas presentes.
Sintaxis:
public DeclaredAnnotation[] getDeclaredAnnotations()
Parámetro: Este método no acepta ningún parámetro.
Valor devuelto: este método devuelve una array de anotaciones declaradas presentes.
Los siguientes programas demuestran el método getDeclaredAnnotations().
Ejemplo 1:
// Java program to demonstrate // getDeclaredAnnotations() method import java.util.*; import java.lang.annotation.*; @Deprecated public class Test { public Object obj; public static void main(String[] args) throws ClassNotFoundException { try { // returns the Class object for this class Class myClass = Test.class; System.out.println( "Class represented by myClass: " + myClass.toString()); // Get the declared annotation // using getDeclaredAnnotations() method System.out.println( "DeclaredAnnotation of myClass: " + Arrays.toString( myClass.getDeclaredAnnotations())); } catch (Exception e) { System.out.println(e); } } }
Producción:
Class represented by myClass: class Test DeclaredAnnotation of myClass: [@java.lang.Deprecated()]
Ejemplo 2:
// Java program to demonstrate // getDeclaredAnnotations() method import java.util.*; import java.lang.annotation.*; // create a custom DeclaredAnnotation @Retention(RetentionPolicy.RUNTIME) @interface DeclaredAnnotation { // This declared annotation has two attributes. public String key(); public String value(); } // call DeclaredAnnotation for method // and pass values for declared annotation @DeclaredAnnotation(key = "GFG", value = "GeeksForGeeks") public class Test { public Object obj; public static void main(String[] args) throws ClassNotFoundException { // returns the Class object for this class Class myClass = Test.class; System.out.println( "Class represented by myClass: " + myClass.toString()); // Get the declared annotation // using getDeclaredAnnotations() method System.out.println( "DeclaredAnnotation of myClass: " + Arrays.toString( myClass.getDeclaredAnnotations())); } }
Producción:
Class represented by myClass: class Test DeclaredAnnotation of myClass: [@DeclaredAnnotation(key=GFG, value=GeeksForGeeks)]
Referencia: https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html#getDeclaredAnnotations–