1.classPizza{2.java.util.ArrayListtoppings；3.publicfinalvoidaddTopping（Stringtopping）{4.toppings.add（topping）；5.}6.}7.publicclassPepperoniPizzaextendsPizza{8.publicvoidaddTopping（Stringtopping）{9.System.out.println（”CannotaddToppings”）；10.}11.publicstaticvoidmain（String[]args）{12.Pizzapizza=newPepperoniPizza（）；13.pizza.addTopping（”Mushrooms”）；14.}15.}Whatistheresult？（）
A.Compilationfails.
B.CannotaddToppings
C.Thecoderunswithnooutput.
D.ANullPointerExceptionisthrowninLine4.
正确答案：参考A
