What is wrong with the following Java code? (Emphasis on Polymorphism)?

Something I find useful is to ign real-life objects to the cles. So let's say Cl1 is a cl Vehicle(), with cles 2 and 3 being Car() and Truck() respectively. So we make a Car() and Truck() and store them in c2 and c3. uming that classes can be cast (since some previous posts already told you this), you can think about this in a more real world sense. "(Class1) c3" casts c3 as an instance of Class1. In other words, it casts a Truck() as a Vehicle(), which should make sense in real life. Then it tries to cast what we have, a Vehicle(), as a Car() and then stores it in a variable of type Car(). Without giving the answer, try to take this and see if the rest will work. Will it compile? Will it run? Hope this helped at all...