AnnotatedElement getAnnotationsByType() method in Java with Examples
Last Updated :
03 Jan, 2020
The getAnnotationsByType() method of java.lang.AnnotatedElement class is used to get the annotations of the specified annotation type present in the class implementing this interface. The method returns an array of annotations for the specified annotation type.
Syntax:
public A[] getAnnotationsByType(Class<T> annotationClass)
Parameter: This method accepts a parameter annotationClass which is the type of the annotation to get.
Return Value: This method returns an array of annotations for the specified annotation type.
Exception: This method throws:
- NullPointerException: if the given annotation class is null.
Below programs demonstrate the getAnnotationsByType() method.
Example 1:
import java.util.*;
import java.lang.reflect.*;
import java.lang.annotation.*;
@Retention (RetentionPolicy.RUNTIME)
@interface Annotation {
public String key();
public String value();
}
@Annotation (key = "GFG" , value = "GeeksForGeeks" )
public class Test {
public Object obj;
public static void main(String[] args)
throws ClassNotFoundException
{
AnnotatedElement myAnnotatedElement
= Test. class ;
System.out.println(
"AnnotatedElement represented"
+ " by myAnnotatedElement: "
+ myAnnotatedElement.toString());
System.out.println(
"Annotation of myAnnotatedElement"
+ " of type Annotation: "
+ Arrays.toString(
myAnnotatedElement
.getAnnotationsByType(
Annotation. class )));
}
}
|
Output:
AnnotatedElement represented by myAnnotatedElement: class Test
Annotation of myAnnotatedElement of type Annotation: [@Annotation(key=GFG, value=GeeksForGeeks)]
Example 2:
import java.util.*;
import java.lang.reflect.*;
import java.lang.annotation.*;
@Deprecated
public class Test {
public Object obj;
public static void main(String[] args)
throws ClassNotFoundException
{
try {
AnnotatedElement myAnnotatedElement
= Test. class ;
System.out.println(
"AnnotatedElement represented"
+ " by myAnnotatedElement: "
+ myAnnotatedElement.toString());
System.out.println(
"Annotation of myAnnotatedElement"
+ " of type Deprecated: "
+ Arrays.toString(
myAnnotatedElement
.getAnnotationsByType(
Deprecated. class )));
}
catch (Exception e) {
System.out.println(e);
}
}
}
|
Output:
AnnotatedElement represented by myAnnotatedElement: class Test
Annotation of myAnnotatedElement of type Deprecated: [@java.lang.Deprecated()]
Reference: https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/AnnotatedElement.html#getAnnotationsByType-java.lang.Class-
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