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