AnnotatedElement isAnnotationPresent() method in Java with Examples
The isAnnotationPresent() method of java.lang.AnnotatedElement class is used to check if an annotation of the specified annotation type is present in the class implementing this interface. The method returns a boolean value stating the same.
Syntax:
public boolean isAnnotationPresent(Class<T> annotationClass)
Parameter: This method accepts a parameter annotationClass which is the type of the annotation to get.
Return Value: This method returns boolean value stating the same.
Exception: This method throws:
- NullPointerException: if the given annotation class is null.
Below programs demonstrate the isAnnotationPresent() 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 static void main(String[] args)
throws ClassNotFoundException
{
AnnotatedElement myAnnotatedElement
= Test. class ;
System.out.println(
"AnnotatedElement represented"
+ " by myAnnotatedElement: "
+ myAnnotatedElement.toString());
System.out.println(
"If there is any annotation"
+ " in myAnnotatedElement: "
+ myAnnotatedElement
.isAnnotationPresent(
Annotation. class ));
}
}
|
Output:
AnnotatedElement represented by myAnnotatedElement: class Test
If there is any annotation in myAnnotatedElement: true
Example 2:
import java.util.*;
import java.lang.reflect.*;
import java.lang.annotation.*;
public class Test {
public static void main(String[] args)
throws ClassNotFoundException
{
AnnotatedElement myAnnotatedElement
= Test. class ;
System.out.println(
"AnnotatedElement represented"
+ " by myAnnotatedElement: "
+ myAnnotatedElement.toString());
System.out.println(
"If there is any annotation"
+ " in myAnnotatedElement: "
+ myAnnotatedElement
.isAnnotationPresent(
Annotation. class ));
}
}
|
Output:
AnnotatedElement represented by myAnnotatedElement: class Test
If there is any annotation in myAnnotatedElement: false
Reference: https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/AnnotatedElement.html#isAnnotationPresent-java.lang.Class-
Last Updated :
03 Jan, 2020
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