JAVA EE: How to access the annotation of a class using Java Reflection

Tuesday, 31 October 2017

How to access the annotation of a class using Java Reflection | Reflection in java

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Display.java

import java.lang.annotation.ElementType;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Inherited
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@interface MyAnnotation
    {

    }

@MyAnnotation
class Display
{
    public void showMessage()
    {
        System.out.println("Hi");
    }
}

ReflectionDemo.java

import java.lang.annotation.Annotation;

/**
 * 
 * We can access the class annotations of a class.
 *
 */
public class ReflectionDemo
{
    public static void main(String[] args)
    {

        Class<Display> classObj = Display.class;

        /*
         * Returns:annotations present on this element.
         */

        Annotation[] annotationArray = classObj.getAnnotations();

        for (Annotation annotation : annotationArray)
        {
            System.out.println(annotation);
        }

    }

}