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Java Class class isAnnotationPresent() method with example

Class class isAnnotationPresent() method: Here, we are going to learn about the isAnnotationPresent() method of Class class with its syntax and example.
Submitted by Preeti Jain, on November 01, 2019

Class class isAnnotationPresent() method

  • isAnnotationPresent() method is available in java.lang package.
  • isAnnotationPresent() method returns true when the annotation for the given type exists on this entity otherwise it returns false.
  • isAnnotationPresent() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
  • isAnnotationPresent() method: may throw an exception at the time checking present annotation.
    NullPointerException: In this exception, when the given annotation class is null.

Syntax:

    public boolean isAnnotationPresent(Class ann_class);

Parameter(s):

  • Class ann_class – represents the Class object similar or correspondent to the annotation type.

Return value:

The return type of this method is boolean, it returns a boolean value based on the following cases,

  • It returns true, when an annotation for the given type exists on this entity.
  • It returns false, when an annotation for the given type does not exists.

Example:

// Java program to demonstrate the example 
// of boolean isAnnotationPresent(Class ann_class) method of Class 

import java.security.*;
public class IsAnnotationPresentOfClass {
    public static void main(String[] args) throws Exception {
        Class ann1 = Identity.class;
        Class ann2 = Deprecated.class;

        // We are checking Annotation Present type of Deprecated 
        //class by using the method isAnnotationPresent()

        boolean b1 = ann2.isAnnotationPresent(ann2);
        System.out.println("is Deprecated an Annotation Present type" + " " + b1);

        // We are checking Annotation Present type of Identity class
        // by using the method isAnnotationPresent()
        boolean b2 = ann1.isAnnotationPresent(ann1);
        System.out.println("is Deprecated an Annotation Present type" + " " + b2);
    }
}

Output

is Deprecated an Annotation Present type false
is Deprecated an Annotation Present type false





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