Concrete classes

Question

hey can someone show me the code on how to write a concrete class for automobiles because ive written the main abstract superclass which should contain the commonalities of serialnumber, and quantity, but im not sure how to write out the first concrete subclass and what it should contain if someone can provide the code thatd be cool thanks.
{ from EdenMonaro }
"I'd start with a pencil and a blank sheet of paper. An abstract Asset class and concrete child classes seem to be a good place to start. What information is common to all your assets? For example, asset number, asset description, purchase date, purchase price, accumulated depreciation, current location.
What information is unique to the child classes? Serial numbers on automobiles and electronic gear? Automobiles have lots of identification numbers: engine numbers, VINs, registration, insurance. CDs have a title and artist(s) with tracks. Furniture is different again, type (desk, chair, etc), colour, finish.
You need another class with collections of assets, perhaps AssetRegister. This is the class you put methods in to list and search assets. "

Answer 1

Implement the asset tracking program. allow the user
to add, modify, and delete electronics, automobiles,
furniture, and cd's. Allow the user to list the assets
by category and search for an asset by its serial
number.
Write an add method, a modify method, a delete method, and your search methods. Make these generic so that can be used for all categories. For a GUI are you going to use a servlet/jsp/html or an application/applet? You need to start writing the pieces that I mentioned and come back with specific implementation questions.