You need a 'cat' object first.

package staticFactoryEcoSystem;

public class Cat extends LifeForm {

   public Cat() {
       System.out.println("Cat default constructor..");
   }//Cat

   public static void main(String[] args) {
       System.out.println("Cat main..");
       //xyz.getX();
       //this generates an error:

       //create a cat object
       Cat myCat = new Cat();

       //get that cat's xyz reference (it's public as declared in LifeForm)
       int x = myCat.xyz.getX();
       System.out.println("The x coordinate = " + x);
   }//main

}//Cat