import java.lang.annotation.*;
import java.lang.reflect.AnnotatedParameterizedType;
import java.lang.reflect.Method;
import java.util.*;
 
public class Main {
    public static void main(String[] args) throws NoSuchMethodException {
        Method m = Foo.class.getDeclaredMethod("bar", List.class);
 
        var at = m.getAnnotatedParameterTypes()[0];
        var ata = ((AnnotatedParameterizedType)at).getAnnotatedActualTypeArguments()[0];
 
        // get all annotations
        for(var a: ata.getAnnotations()) {
            System.out.println(a);
        }
 
        // or check the presence of a known annotation
        System.out.println(ata.getAnnotation(Important.class) != null);
    }
 
    class Foo {
        void bar(List<@Important String> b) {}
    }
}
 
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE_USE)
@interface Important {}
 

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