1. public class Pizza { 2.  ArrayList toppings; 3.  public final void addTopping(String topping) { 4.   toppings.add(topping); 5.  } 7.  public void removeTopping(String topping) { 8.   toppings.remove(topping); 9.  } 10.} And: class PepperoniPizza extends Pizza {  public void addTopping(String topping) {   System.out.prin11n("Cannot add Toppings'");  }  public void removeTopping(String topping){   System out.printIn("Cannot remove Pepperoni");  } } And:  Pizza pizza = new PepperoniPizza();  pizza.addTopping("Mushrooms");  pizza.removeTopping("Pepperon i");