INTERFACE QUESTION.

radhika743 · 25-02-07, 08:58 PM

Q.) Interfaces are syntactically similar to classes,But they lack to Instance Variables. This means that, Interface does not have variables.Then How Interface uses Variables?

**sk_kireeti** · 26-02-07, 02:05 PM

Radhika,

You can have variables within interfaces. By default, they are FINAL STATIC variables.

Thanks,
Krishna

Laxminarayanak · 27-02-07, 06:54 PM

Radhika,
As kireeti said the Inteface can have variables. Those are Final and static by default it is right.
I think it might be useful info on this one thing is Interface and class are similar in structure the only difference is that the interface can't have implementation for the methods where as the class can have.

You can use the Interface variables like static variables of a class
for example in jdbc while creating the statement
we will use the properties to get the statment type
there we will use the ResultSet.CONCUR_READ_ONLY along the TRANSACTION_READ_COMMIT , etc.

25-02-07, 08:58 PM	#1 (permalink)
radhika743 Senior Member Join Date: Aug 2006 Age: 28 Posts: 275 Thanks: 0 Thanked 5 Times in 5 Posts Thanks: 0 Thanked 5 Times in 5 Posts Rep Power: 5	INTERFACE QUESTION. Q.) Interfaces are syntactically similar to classes,But they lack to Instance Variables. This means that, Interface does not have variables.Then How Interface uses Variables?

26-02-07, 02:05 PM	#2 (permalink)
sk_kireeti Super Moderator Join Date: Feb 2006 Location: Hyderabad Posts: 2,355 Thanks: 117 Thanked 241 Times in 198 Posts Thanks: 117 Thanked 241 Times in 198 Posts Blog Entries: 4 Rep Power: 51	Re: INTERFACE QUESTION. Radhika, You can have variables within interfaces. By default, they are FINAL STATIC variables. Thanks, Krishna

27-02-07, 06:54 PM	#3 (permalink)
Laxminarayanak Member Join Date: Jan 2007 Posts: 32 Thanks: 3 Thanked 3 Times in 3 Posts Thanks: 3 Thanked 3 Times in 3 Posts Rep Power: 2	Re: INTERFACE QUESTION. Radhika, As kireeti said the Inteface can have variables. Those are Final and static by default it is right. I think it might be useful info on this one thing is Interface and class are similar in structure the only difference is that the interface can't have implementation for the methods where as the class can have. You can use the Interface variables like static variables of a class for example in jdbc while creating the statement we will use the properties to get the statment type there we will use the ResultSet.CONCUR_READ_ONLY along the TRANSACTION_READ_COMMIT , etc. __________________ Cheers, Laxmi

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