Difference between Enumeration<? extends ZipEntry> and Enumeration?

Question

Is there a difference between Enumeration and Enumeration? If so, what is the difference?

Answer 1

Yes, straight from one of the sun generics tutorials:

Here Shape is an abstract class with three subclasses: Circle, Rectangle, and Triangle.

public void draw(List shape) {
  for(Shape s: shape) {
    s.draw(this);
  }
}

It is worth noting that the draw() method can only be called on lists of Shape and cannot be called on a list of Circle, Rectangle, and Triangle for example. In order to have the method accept any kind of shape, it should be written as follows:

public void draw(List shape) {
   // rest of the code is the same
}