Get types of all instance variables in Java

I have a class named Attributes, which has some instance variables as listed below:

public class Attributes {
   protected A variable1;
   protected B variable2;
   protected C variables3;
   
   /*
     Getters and Setters of each method.
  */
   
}

I want the list of all instance variables' types present in the class.

The output: [A,B,C]

This contains all possible dataTypes present in this class.

Can someone please suggest a way?

NOTE: I've seen reflection, but I think it is useful only if we have filled the values for these variables and we want to fetch the values and names of those variables, not the types.