extending given interface

[pramod karnani]

Hi All,

I created separate interface to declare extra methods which extends Sun interface.
That sub interface is implemented by Data class so it means Data class also implements Sun interface also , correct?



Regards,
Pramod

[K. Tsang]

Hi Pramod,

Before you work with the Sun interface, you need to decide to use RMI or Sockets. And is "extending" Sun interface a good idea? Ultimately your Data class needs to implement Sun's interface or its sub-interface.

So the answer to your second question is correct. First question you should rethink if that is the way to go. Do think about how client catch exceptions when designing your "service layer".

As for the submission jar file http://faq.javaranch.com/java/ScjdFaq#submissionJarName

[Yucca Nel]

pramod karnani wrote:
Hi All,

I created separate interface to declare extra methods which extends Sun interface.
That sub interface is implemented by Data class so it means Data class also implements Sun interface also , correct?



Regards,
Pramod

Leave db.java alone! Do research on code to an interface and not implementation. (google it). Sun may perform the following check on your interface.

DB candidatesDB = new Data();

This is why Data MUST extends DB. Whats more is why can the sun interface not extend it's own interface that it need functions for?

[Roel De Nijs]

Hi pramod,

According to your description, you did something like this:

interface PramodInterface extends SunInterface {
   // extra methods
}
class Data implements PramodInterface {
   // implementation of all methods
}

This is just a fine approach, nothing wrong with it. I used exactly same approach.

Kind regards,
Roel

[Roberto Perillo]

Roel De Nijs wrote:This is just a fine approach, nothing wrong with it. I used exactly same approach.

Me too!