import java.lang.reflect.*;
import java.lang.annotation.*;
 
// The Annotation Type
@Retention(RetentionPolicy.RUNTIME) 
@interface SayHi {
     public String value();
}

// The Annotated Class
@SayHi("Hello, class!") 
class HelloWorld {
     
     @SayHi("Hello, field!") 
     public String greetingState;

     @SayHi("Hello, constructor!") 
     public HelloWorld() {
     }

     @SayHi("Hello, method!") 
     public void greetings() {
     }
}

// The Annotation Consumer
public class HelloWorldAnnotationTest
{
  public static void main( String[] args ) throws Exception
  {
    //access the class annotation
    Class<HelloWorld> clazz = HelloWorld.class;
    System.out.println( clazz.getAnnotation( SayHi.class ) );

    //access the constructor annotation
    Constructor<HelloWorld> constructor =
            clazz.getConstructor((Class[]) null);
    System.out.println(
            constructor.getAnnotation(SayHi.class));

    //access the method annotation
    Method method = clazz.getMethod("greetings");
    System.out.println(method.getAnnotation(SayHi.class));

    //access the field annotation
    Field field = clazz.getField("greetingState");
    System.out.println(field.getAnnotation(SayHi.class));
  }
}