Is there are any way to get all the fields of x type by reflection utils

I am trying to find a way to get all the fields instances of X type by ReflectionUtil.

A extends of X:       
   List<X> xList;
   X arg1;

B extends of X:
   String argB;

C extends of X:
   X argC;

initialization:

List<C> list = new ArrayList();
B item1 = new B("item1")
B item2 = new B("item2")
list.add(item1)
list.add(item2)
B b = new B("test")
A myAClass = new A(list,b)

I can access to myAClass object and I want to get all the nested fields instances of X type.

In above example after the initialization the types are:

MyAClass is:
    List<C> xList;
    B arg1;

C class is:
    B argC;

B class is:
    String argB;

The result that I expected for is: [C, B , B, B] where [C - List xList , B - an item of xList , B - an item of xList, B - an argB]