Create an annotation in Java

CustomAnnotation.java

import java.lang.annotation.ElementType;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.Target;

@Target(ElementType.METHOD)

@Retention(RetentionPolicy.RUNTIME)

public @interface CustomAnnotation {

     int studentAge() default 21;

     String studentName();

     String stuAddress();

     String stuStream() default "CS";

}

How to use the field of Annotation in Java?

TestCustomAnnotation.java

package annotations;

import java.lang.reflect.Method;

public class TestCustomAnnotation {

     public static void main(String[] args) {

           new TestCustomAnnotation().testAnnotation();

     }

     @CustomAnnotation(

                studentName="Rajesh",

                stuAddress="Mathura, India"

     )

     public void testAnnotation() {

           try {

                Class<? extends TestCustomAnnotation> cls = this.getClass();

                Method method = cls.getMethod("testAnnotation");

               

                CustomAnnotation myAnno = method.getAnnotation(CustomAnnotation.class);

               

                System.out.println("Name: "+myAnno.studentName());

                System.out.println("Address: "+myAnno.stuAddress());

                System.out.println("Age: "+myAnno.studentAge());

                System.out.println("Stream: "+myAnno.stuStream());

               

           } catch (NoSuchMethodException e) {

           }

     }

}
Output:
Name: Rajesh
Address: Mathura, India
Age: 21
Stream: CS