Как передать информацию в аннотацию?

Объявим аннотацию:

@Retention (RetentionPolicy.RUNTIME)
public @interface MyAnnotation {
    String name() default "";
}

Реализуем в классе:

public static class DynamicAnnotation implements MyAnnotation {
    private String name;
    public DynamicAnnotation(String name) {
        this.name = name;
    }
    @Override
    public String name() {
        return name;
    }
    @Override
    public Class<? extends Annotation> annotationType() {
        return DynamicAnnotation.class;
    }
}
@MyAnnotation(name = "Dragon Warrior")
public static class Demo {
}

Метод по замене:

private static final String ANNOTATIONS = "annotations";
public static final String ANNOTATION_DATA = "annotationData";
public static void alterAnnotationOn(Class clazzToLookFor, Class<? extends Annotation> annotationToAlter, Annotation annotationValue) {
    try {
        Method method = Class.class.getDeclaredMethod(ANNOTATION_DATA, null);
        method.setAccessible(true);
        Object annotationData = method.invoke(clazzToLookFor);
        Field annotations = annotationData.getClass().getDeclaredField(ANNOTATIONS);
        annotations.setAccessible(true);
        Map<Class<? extends Annotation>, Annotation> map = (Map<Class<? extends Annotation>, Annotation>) annotations.get(annotationData);
        map.put(annotationToAlter, annotationValue);
    }
    catch (Exception e) {
        e.printStackTrace();
    }
}

Проверяем:

MyAnnotation greet = Demo.class.getAnnotation(MyAnnotation.class);
System.err.println("Hello there [" + greet.name() + "]");
DynamicAnnotation altered = new DynamicAnnotation("KungFu Panda");
alterAnnotationOn(Demo.class, MyAnnotation.class, altered);
greet = Demo.class.getAnnotation(MyAnnotation.class);
System.err.println("After alteration...Hello there [" + greet.name() + "]");

Выведет:

Hello there [Dragon Warrior]
After alteration...Hello there [KungFu Panda]

Пример отсюда. Я скопировал только пример для Java 8. Там есть и для Java 7.