Stack Inheritance

import java.util.Stack;

class Main {
    public static void main(String[] args) {
        System.out.println("Hello World!");
        
        Stack<Dog> p = new Stack();
        Dog d = new Dog();
        Labradoodle l = new Labradoodle();
        
        //Number 2
        p.push(l);
        d = p.pop();
        
        //Number 4
        p.push(l);
        l = (Labradoodle) p.pop();
        

    }
}