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To obtain the value of an annotation by using reflection, follow these steps:

1. Get the class object for the annotation type using Class.forName(String) method or the .class syntax. For example:

Class<MyAnnotation> annotationClass = MyAnnotation.class;

1. Get the target element for which the annotation is present. This could be a class, method, field, parameter, etc. using appropriate reflection methods. For example:

Class<MyClass> targetClass = MyClass.class;
MyAnnotation annotation = targetClass.getAnnotation(MyAnnotation.class);

1. Access the attribute value of the annotation using the appropriate method. For example:

String value = annotation.value();

Here, value() is the method defined in the MyAnnotation interface. Replace value() with the name of the appropriate method if the annotation has other attributes.

Note: If the target element is a method or a field, you may need to use additional reflection methods to get the annotations on the parameters or the generic type of the field or method.