Assume that Animal extends Object (and assume Animal is an abstract class, no other abstract classes) and that FarmAnimal extends Animal Cow extends FarmAnimal Chicken extends FarmAnimal Assume all the above classes have a default constructor. Which of these statements compile? Animal a1 = new Animal(); ______ Animal a2 = new Cow(); ______ Cow a3 = new Animal(); ______ Cow a4 = new FarmAnimal(); ______ FarmAnimal a5 = new Cow(); ______ Cow a6 = new Cow(); ______ Cow a7 = new Chicken(); ______ Chicken a8 = new Cow(); _____ Chicken a9 = new FarmAnimal(); ______

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Assume that Animal extends Object (and assume Animal is an abstract class, no other abstract classes) and that FarmAnimal extends Animal Cow extends FarmAnimal Chicken extends FarmAnimal Assume all the above classes have a default constructor. Which of these statements compile? Animal a1 = new Animal(); ______ Animal a2 = new Cow(); ______ Cow a3 = new Animal(); ______ Cow a4 = new FarmAnimal(); ______ FarmAnimal a5 = new Cow(); ______ Cow a6 = new Cow(); ______ Cow a7 = new Chicken(); ______ Chicken a8 = new Cow(); _____ Chicken a9 = new FarmAnimal(); ______

MIT 6.00 Intro Computer Science (OCW)
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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Animal a1 = new Animal(); Animal a2 = new Cow(); FarmAnimal a5 = new Cow();
*assuming this is Java and the rules of polymorphism is the question
http://docs.oracle.com/javase/tutorial/java/IandI/polymorphism.html This tutorial should help clear up any confusion

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Animal a1 = new Animal(); doesn't compile! Animal is an abstract class and can't be instantiated. Animal a1 = new Animal(); Does not compile, Animal is abstract Animal a2 = new Cow(); Compiles, Cow is a subclass of Animal and is not abstract Cow a3 = new Animal(); Does not compile, Animal is abstract Cow a4 = new FarmAnimal(); Does not compile, FarmAnimal isn't a subclass of cow (it's superclass) FarmAnimal a5 = new Cow(); Compiles, Cow is a subclass of FarmAnimal Cow a6 = new Cow(); Compiles Cow a7 = new Chicken(); Does not compile, Chicken isn't a subclass of Cow Chicken a8 = new Cow(); Does not compile, Cow isn't a subclass of Chicken Chicken a9 = new FarmAnimal(); Does not compile, FarmAnimal isn't a subclass of Chicken

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