Playing Compilera. Suppose that, in Example 13.4, Playable is implemented as a class rathe...

Playing Compiler

a. Suppose that, in Example 13.4, Playable is implemented as a class rather than an interface:

and CD, DVD, and MP3 each extends Playable. Will the compiler complain?

b. Suppose that, in Example 13.4, a new method, source(), is added to each subclass.

The following code, adapted from Example 13.4, causes an error. Is this error a compile time error or a runtime error? Explain your answer.

public static printList(Playable[] x){      // accepts an array x of Playable and invokes two methods for each object in x      for ( int i = 0; i < x.length; i++)      {            x[i]play();            x[i].source();      }}