[tim]

Hello java_fun2007.

I forgot to tell you about casting. Lets say that you have defined some method in the DVD class that is not inherited or overridden from its super class, but you need to use it. For this you can use casting. When you cast you must use brackets and class name of the class you need. For example:

Code:

Vedio media = new DVD();
if (media instanceof DVD){
    // now we know it's an DVD and we can cast
    DVD dvd = (DVD) media;
    // now you can use dvd with all the methods and attributes of a real DVD instance.
}

I hope this helped. This is pretty important stuff.