Re: java inheritance
On 11.11.2013 14:30, asdf9797 wrote:
Hi
I did a java test recently and one of the questions was on the subject of
inheritance/ OO design
The idea was there was a "Storable" abstract class which contained a store() method.
There was a IStorable interface
And then there was
class Book extends Storable implements IStorable {
public void save(Book) {
}
}
The question was how to improve the implementation.
Get rid of the argument of method save(). A Book has immediate access
to all its state.
If at all, you would want to pass something like a Store, a Store
interface or something which is able to store data. For that it would
have to exhibit methods for basic store operations much like DataOutput
does.
http://docs.oracle.com/javase/7/docs/api/java/io/DataOutput.html
What is the current thinking on extending abstract classes ?
Extending abstract classes is absolutely necessary.
Is that the issue?
What?
Kind regards
robert
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