[gibsonrocker800]

I'm not too good at generic programming, but i believe that E will have to be a Comparable because how else will the MergeSort know how to sort these elements. So, you have to write something like this for the class declaration:

Code:

public class MergeSort<E extends Comparable>

Saying E extends Comparable means E extends or implements the following class or interface, so in this case, we're saying E implements Comparable.
You may need to incorporate this information somewhere in your class, because i don't understand how else you can sort Objects if they can't be compared.

There are many other things you can do with these limitations. They are called wildcards.

Code:

   ? extends E

The specified type must be a subclass of E

Code:

   ? super E

The specified type must be a superclass of E

Code:

   ?

All types


Hope that information helps you, and anyone interested in generic programming.