How to create a method which only works if the generic type variable specified in class name is an Integer

Question

I have a class which uses a generic type parameter. I want to write a method that only executes if the type parameter is Integer.

The specific scenario I am getting this question from is as follows: My assignment is to write a method, range(), for an AVLtree class which returns the difference of the minimum and maximum values of the tree. I tried returning maxNode.getE() - minNode.getE(), but this gives me a compiler error saying

error: bad operand types for binary operator '-'
                   return max.getE()-min.getE();
                                    ^
  first type:  E
  second type: E
  where E is a type-variable:
    E extends Comparable<? super E> declared in class AVLtreeCC

So is it possible to write a method that only executes when "E" is Integer.

The code below gives a visualization of what I am trying to acheive. I know T instanceof Integer will give a compiler error. I am trying to figure out what class T is.

class myClass<T>{
    void foo(){
        if(T instanceof Integer){
            ...
        }
        else{
            System.out.println("T is not of the Integer class, so this method will not work");
        };
    }
}