java.lang.Package.isAnnotationPresent(Class<? extends Annotation> annotationClass)

package com.codingdict;



import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.lang.reflect.Method;



// declare a new annotation

@Retention(RetentionPolicy.RUNTIME)

@interface Demo {

   String str();

   int val();

}



public class PackageDemo {



   // set values for the annotation

   @Demo(str = "Demo Annotation", val = 100)



   // a method to call in the main

   public static void example() {

      PackageDemo ob = new PackageDemo();



      try {

         Class c = ob.getClass();



         // get the method example

         Method m = c.getMethod("example");



         // get the annotation for class Demo

         Demo annotation = m.getAnnotation(Demo.class);



         // print the annotation

         System.out.println(annotation.str() + " " + annotation.val());

      } catch (NoSuchMethodException exc) {

         exc.printStackTrace();

      }

   }



   public static void main(String args[]) {

      example();



      Package[] pack = Package.getPackages();



      // check if annotation hello exists

      for (int i = 0; i < pack.length; i++) {

         System.out.println("" + pack[i].isAnnotationPresent(Demo.class));

      }

   }

}