How can I retrieve the value of an annotation on the annotated method??
I have:
@myAnnotation(attribute1 = value1, attibute2 = value2) public void myMethod() { //I want to get value1 here }
getAnnotation(Class< T > annotationClass) method of Method class returns Method objects's annotation for the specified type passed as parameter if such an annotation is present, else null. This is important method to get annotation for Method object.
Annotations, just like methods or fields, can be inherited between class hierarchies. If an annotation declaration is marked with @Inherited , then a class that extends another class with this annotation can inherit it. The annotation can be overridden in case the child class has the annotation.
The getAnnotation() method of java. lang. Class class is used to get the annotation of the specified annotation type, if such an annotation is present in this class. The method returns that class in the form of an object.
Annotation is defined like a ordinary Java interface, but with an '@' preceding the interface keyword (i.e., @interface ). You can declare methods inside an annotation definition (just like declaring abstract method inside an interface). These methods are called elements instead.
Method
instance.Something like:
Method m = getClass().getMethod("myMethod"); MyAnnotation a = m.getAnnotation(MyAnnotation.class); MyValueType value1 = a.attribute1();
You'll need to catch / handle the appropriate exceptions, of course. The above assumes you are indeed retrieving method from the current class (replace getClass()
with Class.forName()
otherwise) and the method in question is public (use getDeclaredMethods()
if that's not the case)
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